Nessler Cylinder Stand

Quick Answer: A Nessler cylinder stand is a rack that holds several Nessler cylinders upright and level, side by side, so the colour or turbidity of their contents can be compared by looking down through the liquid columns. It is used in water analysis and pharmacopoeial limit tests.

Why Nessler Tubes Need a Dedicated Stand

Nessler comparison works by viewing a tall column of liquid from above, against a white background, where a faint tint becomes visible because light passes through the whole depth of solution. The test and the standard must stand at the same height, vertical and close together, or the comparison is unfair. The stand holds the tubes in exactly that arrangement and keeps them from being knocked over while reagents are added and colour develops.

The listing image filename refers to polypropylene; the title does not state the material or the number of positions, so both should be confirmed. Designs vary: many place the cylinders over a white or opal base so light passes up through the columns, and some older patterns use an angled mirror beneath the tubes. A plastic stand does not corrode from the acids and ammonium solutions used in these tests.

It is made for flat-bottomed cylinders such as the Nessler cylinder listed in this range or the glass Nessler tube cylinder. Check that the diameter of your cylinders matches the stand openings before ordering in quantity.

Applications

Nesslerisation of water samples, where Nessler’s reagent gives a yellow to brown colour with ammonia and the sample is matched against standards
Limit tests for chloride and sulfate in pharmacy practicals, comparing the opalescence or turbidity of the test with a standard
The limit test for iron, in which a pink to purple colour is compared with a standard solution
Any visual colorimetric series in which a sample is bracketed between prepared standards

Care & Handling

Wipe up spilled Nessler’s reagent immediately; it contains mercury compounds, so collect the waste for hazardous disposal rather than washing it down the sink.
Keep the viewing base clean and unscratched, since marks on it look like colour differences in the tubes.
Rinse the stand with water after acid or ammonia spills and let it dry before storing.

Specifications

Item	Stand holding Nessler cylinders upright, side by side
Material	Plastic; listing image filename indicates polypropylene
Holds	Flat-bottomed Nessler cylinders of matching diameter
Viewing	From above, through the liquid column, against a light background
Number of positions and base design	Confirm at enquiry

Why Choose LabEquip

Water-testing labs, public health training centres and pharmacy colleges that teach limit tests buy the stand together with matched cylinders. LabEquip also supplies pharmacy lab equipment for these courses; tell us your cylinder size and number of positions through the contact page.

Frequently Asked Questions

Why are Nessler tubes viewed from above rather than from the side?

Looking down through the full depth of liquid multiplies the absorbance of a faint colour, so small differences between sample and standard become visible. From the side, light passes through only the width of the tube and pale tints look almost colourless.

Do the cylinders need to be matched?

Yes. Test and standard cylinders should have the same internal diameter, glass tint and height of liquid, otherwise the light path differs and the comparison is biased. Use cylinders from the same set and fill to the same mark.

What is Nessler’s reagent used to detect?

It is an alkaline solution of potassium tetraiodomercurate(II) that gives a yellow to brown colour with ammonia and ammonium ions. The intensity rises with concentration, which is why samples are compared with a series of standards.

Is the plastic stand affected by the acids used in limit tests?

Polypropylene generally resists the dilute nitric and hydrochloric acids used in chloride and sulfate limit tests. Rinse off spills promptly anyway, as dried residues can mark the viewing surface.

How long should colour develop before comparing?

Follow the time given in the method you are using, often several minutes, and treat sample and standard identically. Comparing too early, or leaving one tube longer than the other, is a common source of error in visual colorimetry.

Where should the stand be placed for viewing?

Place it on a bench near diffuse daylight or a white light source, with a white surface under the tubes if the base is not already white. Avoid strong coloured light and direct sun, which can mask slight differences in tint.

Last Updated: September 2026

Narrow Mouth Bottle, Plastic

Quick Answer: A narrow mouth plastic bottle is a screw-capped laboratory bottle with a small neck opening, typically moulded in polyethylene or polypropylene, used to store and pour liquid reagents, buffers, standards and water samples.

Narrow Mouth vs Wide Mouth: Which Bottle for Which Job

A narrow neck is the standard shape for liquids. The small opening pours in a controlled stream with less dribbling down the side, exposes less of the contents to air while the bottle is open, and takes a smaller cap that is easy to close tightly. That makes the Narrow Mouth Bottle, Plastic the everyday container for made-up solutions: dilute acids and alkalis, buffers, indicator solutions, standards and distilled water.

A wide mouth bottle is chosen instead for powders, pastes and solids that have to be spooned in and out, and it is easier to scrub inside. For bulk volumes that are too heavy to pour by hand, a carboy serves as the reservoir and narrow mouth bottles are filled from it for bench use.

Laboratory narrow mouth bottles are usually HDPE, LDPE or PP. Polyethylene is tough and generally resists aqueous acids, alkalis and salts; polypropylene offers similar resistance and is generally the one that can be autoclaved. Plastic is also preferred to glass for strong alkali solutions, which slowly attack glass and can seize a glass stopper, and for hydrofluoric acid, which etches glass.

Specifications

Type	Narrow mouth (narrow neck) laboratory bottle
Material	Plastic; bottles of this type are commonly HDPE, LDPE or PP
Closure	Screw cap
Suited to	Liquids: reagents, buffers, standards, water samples
Autoclaving	Depends on the polymer: PP is generally autoclavable, polyethylene usually is not
Capacities	To be confirmed at enquiry

Applications

Storing sodium hydroxide and other alkali solutions used in titration practicals.
Holding prepared buffers and indicator solutions at student benches.
Collecting and transporting water samples for chemical testing.
Supplying distilled water or dilute reagents in class practical sets.

Care & Handling

Label each bottle with its contents, concentration and preparation date.
Leave headspace below the neck; liquids expand as they warm and a brim-full bottle can leak at the cap.
Dedicate a bottle to one solution where possible, since plastics can hold traces of earlier contents.
Store bottles away from direct sunlight and heat sources.

Why Choose LabEquip

Chemistry departments and water-testing labs buy narrow mouth plastic bottles in sets to equip reagent shelves and student practical trays. For solids, compare the wide mouth square plastic bottle; for solvents that are better kept in glass, see the narrow mouth reagent bottles in glass. Browse the Lab Glassware range or ask LabEquip for a quote.

Frequently Asked Questions

When should I use a narrow mouth bottle instead of a wide mouth bottle?

Use a narrow mouth bottle for liquids you pour, because the small neck gives a controlled stream and a tight seal. Use a wide mouth bottle for powders, solids and thick materials that must be scooped out, or when the inside needs thorough cleaning.

Is a plastic bottle suitable for sodium hydroxide solution?

Yes. Polyethylene and polypropylene generally resist alkali solutions, which is why sodium hydroxide and potassium hydroxide solutions are commonly kept in plastic. Strong alkali slowly attacks glass and can make glass stoppers stick.

Can the narrow mouth bottle be autoclaved?

That depends on the polymer. Polypropylene bottles are generally autoclavable, while polyethylene softens at autoclave temperatures. Check this bottle’s rating first, and loosen the cap during autoclaving so pressure can equalise.

Which chemicals should not be stored in it?

Avoid long-term storage of aromatic and chlorinated solvents such as benzene, toluene and chloroform, and strong oxidisers such as concentrated nitric acid, which can attack or permeate polyolefin plastics. Use glass or a container rated for those chemicals.

How should the bottle be cleaned before reuse?

Empty it, wash with a mild laboratory detergent and a bottle brush, rinse several times with tap water, then finish with distilled or deionised water. Drain it upside down and let it dry fully before capping.

Does a plastic bottle affect trace analysis?

It can in either direction. Plastic avoids the sodium, boron and silicate that glass can release, which helps for those determinations, but some plastics adsorb trace metals or leach additives. Clean the bottle with dilute acid and rinse with high-purity water before trace work.

Last Updated: September 2026

Heavy Duty Vacuum Bottle, Plastic

Quick Answer: The Heavy Duty Vacuum Bottle, Plastic is a thick-walled plastic bottle built for use under reduced pressure, serving in vacuum filtration as the filtrate receiver or as a trap between the filter and the vacuum pump or aspirator.

Why a Vacuum Bottle Needs Heavy Walls

An ordinary plastic storage bottle is designed for atmospheric pressure; if air is pumped out of it, the thin walls can pull inward and collapse. A heavy duty vacuum bottle has thicker walls and a sturdier shape so it can be evacuated as part of a filtration or aspiration line. It is closed with a cap or stopper carrying tubing connections: one line goes to the filter holder or aspirating tip, the other to the vacuum source.

In a set-up it does the job of a glass Buchner (side-arm) filtering flask, but in plastic. It will not shatter if knocked over and is lighter to handle at larger volumes. On the other side, plastic is less clear than glass and less tolerant of organic solvents, so the bottle suits aqueous work such as clarifying buffers, filtering water samples and collecting media filtrate.

Placed between the filtration vessel and the pump, the same bottle acts as a trap: any liquid drawn past the filter collects in it instead of reaching the pump oil or the aspirator line. Many labs run two in series, one as receiver and one as trap.

Applications

Receiving filtrate beneath a membrane filter holder or Buchner funnel during vacuum filtration of aqueous solutions.
Acting as a liquid trap that protects a vacuum pump or water aspirator.
Collecting aspirated supernatant or waste liquid in microbiology teaching labs, with a suitable disinfectant in the bottle.
Holding aqueous buffers while they are degassed under vacuum.

Care & Handling

Inspect the bottle for cracks, crazing, deep scratches or deformation before each use, and retire it if any appear.
Keep organic solvents out of it; a wall weakened by solvent is a hazard under vacuum.
Release the vacuum slowly and fully before opening the cap or disconnecting the tubing.
Stand the evacuated set-up where a sudden collapse would not tip liquid onto people or electrical equipment.

Specifications

Type	Vacuum-duty receiver and trap bottle
Material	Plastic; vacuum bottles of this kind are commonly made in polypropylene or polycarbonate
Construction	Heavy, thick walls for use under reduced pressure
Connection	Joined to the filter holder and vacuum source with flexible tubing
Vacuum rating	Not stated in the product title
Capacity	To be confirmed at enquiry

Why Choose LabEquip

Colleges, microbiology labs and water-testing labs that filter aqueous samples in volume, and want to avoid glass flasks at student benches, are the main buyers of this bottle. It pairs with the vacuum filtration apparatus and with T and Y plastic connectors for branching the vacuum line. To plan a complete filtration set-up, write to LabEquip with your filter size and bottle volume.

Frequently Asked Questions

What is a heavy duty vacuum bottle used for?

It is used under reduced pressure in vacuum filtration, either as the vessel that collects the filtrate or as a trap that stops liquid reaching the vacuum pump or aspirator. Its thick walls are what set it apart from an ordinary storage bottle.

How is it different from a glass Buchner flask?

Both collect filtrate under vacuum. The glass flask is clearer and copes better with organic solvents; the plastic bottle is lighter and will not shatter if knocked over, which makes it practical for aqueous filtrations and larger volumes.

What level of vacuum can the bottle take?

The product title does not give a vacuum rating, so check the rating of this bottle before use and stay within it. Never substitute an ordinary thin-walled plastic bottle, which can collapse under vacuum.

Can the vacuum bottle be used with organic solvents?

It is not advisable. Polycarbonate is attacked by chlorinated solvents, ketones and strong alkalis, and polypropylene can swell in some solvents. A softened wall is dangerous under vacuum, so use a glass filtering flask for solvent filtrations.

How do I stop water sucking back from a tap aspirator?

Fit a trap between the aspirator and the filtration vessel, and always break the vacuum at the filter side before turning off the water. Turning the water off first lets the pressure difference pull water back into the bottle.

Can the bottle be autoclaved?

That depends on its plastic. Polypropylene is generally autoclavable, and polycarbonate tolerates a limited number of cycles before it starts to craze and lose strength. Because the bottle is used under vacuum, inspect it closely after every autoclave cycle.

Last Updated: September 2026

Conical Flask, Plastic

Quick Answer: A plastic conical flask is an Erlenmeyer-shaped flask moulded from plastic, with a flat base, sloping sides and a narrow neck. It is used for mixing, swirling and holding solutions where a glass flask could break, but it is not meant for flame heating.

Choosing a Plastic Conical Flask Over Glass

The shape is the same as the glass Erlenmeyer: a wide base for stability and a narrowing body that keeps liquid inside when it is swirled. What changes is the material. A plastic flask survives a drop onto the floor, weighs less when full, and is a sensible choice for younger classes, field work and any practical where broken glass would be the bigger hazard.

The title does not state the resin. Polypropylene flasks are translucent and generally autoclavable at 121 °C, which suits media preparation and culture work. Polymethylpentene (TPX) flasks come close to glass in clarity and are also generally autoclavable. Polycarbonate is clear but is attacked by alkalis. The choice matters most for titration, where a cloudy wall makes a faint end point harder to see.

For boiling, refluxing or heating on a tripod and gauze, the glass Erlenmeyer flask remains the correct choice. Plastic flasks belong to room-temperature and moderate-temperature work, and to the storage of aqueous solutions.

Specifications

Item	Conical (Erlenmeyer-pattern) flask with flat base and narrow neck
Material	Plastic; resin (for example polypropylene or TPX) to be confirmed
Heating	Not for direct flame or hot plate use
Typical uses	Mixing, swirling, storing aqueous solutions, culture media
Capacity	Confirm at enquiry

Care & Handling

Mix by swirling from the wrist while holding the neck; plastic walls flex slightly if the body is gripped hard.
Avoid scouring pads and abrasive powders, which scratch plastic and make it cloudy; use a soft brush and mild detergent.
Before autoclaving, confirm the resin and leave any closure loose.
Wipe off spills of acetone or chloroform promptly, and keep solvent use to liquids the resin is known to resist.

Where Plastic Conical Flasks Are Used

Class practicals with younger students, where dropped glassware is a real risk
Preparing and storing aqueous solutions, such as dilute salt or sugar solutions, for later lessons
Growing yeast or microbial cultures in an autoclavable flask plugged with cotton wool
Field sampling of pond or stream water, where glass is awkward to carry

Why Choose LabEquip

Schools and training labs that want fewer breakages at student benches often add plastic flasks alongside their glass stock. LabEquip lists this flask in its chemistry lab equipment range; send the capacity and resin you need through the contact page.

Frequently Asked Questions

Can a plastic conical flask be used for titration?

Yes, if the wall is clear enough to judge the colour change. Clear resins such as TPX show end points well, while translucent polypropylene makes faint changes, like the pale pink of phenolphthalein, harder to see against a white tile.

Can I heat a plastic flask on a hot plate?

Not over a flame or on a hot plate. Warm liquids are acceptable within the resin’s temperature limit, and polypropylene or TPX flasks can generally be autoclaved, but direct heating can soften or distort the flask.

Is the flask autoclavable?

It depends on the resin. Polypropylene and polymethylpentene are generally autoclavable at 121 °C, while polystyrene and polyethylene are not. Check the resin marking on the flask before sterilising.

Which chemicals attack plastic flasks?

Strong oxidising acids and many organic solvents, such as chlorinated hydrocarbons, aromatic solvents and, for some resins, acetone, can soften or craze plastics. Dilute acids, alkalis and salt solutions are generally handled well by polypropylene.

Why choose a conical shape rather than a plastic beaker?

The narrowing body stops liquid being thrown out during swirling and slows evaporation, and the neck accepts a stopper or cotton-wool plug. A beaker is easier to pour from but loses liquid when shaken.

Does a plastic flask scratch more easily than glass?

Yes. Plastic is softer, so abrasive cleaning and hard brushes leave marks that trap residues and reduce clarity. Clean with warm water, mild detergent and a soft brush, and replace flasks that have turned cloudy.

Last Updated: September 2026

Carboy, Plastic

Quick Answer: A plastic carboy is a large laboratory container, usually moulded in polyethylene or polypropylene, used to store, carry and dispense bulk liquids such as distilled water, buffers, dilute reagents and collected aqueous waste.

Where a Plastic Carboy Fits Among Lab Containers

The Carboy, Plastic is the container a lab turns to when the volume outgrows ordinary reagent bottles. It holds the day’s or week’s supply of distilled or deionised water, a large batch of buffer, or aqueous rinse waste waiting for neutralisation. Carboys generally have a screw closure and carrying handles, and many are also offered with a tap near the base so liquid can be drawn off without lifting and tipping a heavy vessel.

A carboy and a narrow mouth bottle do different jobs. The bottle is poured by hand at the bench; the carboy is heavy when full, so it normally stays in one place, is filled at the top and emptied through a tap or by siphon. Many labs keep one carboy as the reservoir and decant from it into bench bottles and wash bottles.

The polymer decides what a carboy can hold. Polyethylene (HDPE or LDPE) is tough and generally resists aqueous acids, alkalis and salt solutions; polypropylene has similar chemical resistance and is generally the grade chosen when a carboy must be autoclaved. The title of this listing says only “plastic”, so check which polymer it is before storing solvents or putting it through an autoclave.

Specifications

Type	Carboy for bulk liquid storage and dispensing
Material	Plastic; laboratory carboys are commonly HDPE, LDPE or PP, and the polymer sets heat and solvent suitability
Closure	Screw cap at the neck, typical of laboratory carboys
Typical contents	Distilled or deionised water, buffers, dilute reagents, aqueous waste
Level visibility	Natural polyethylene and polypropylene are translucent, so the fill level can usually be seen through the wall
Capacity	To be confirmed at enquiry

Care & Handling

Label every carboy with its contents and date, and never reuse a waste carboy for water or reagents.
Store it out of direct sunlight: UV light slowly degrades polyethylene and polypropylene and encourages algae in stored water.
Lift a full carboy with both hands by its handles or move it on a trolley; never carry it by the cap or neck.
If a tap is fitted, check it and its washer for drips before leaving the carboy full overnight.

Applications

Reservoir of distilled or deionised water for filling wash bottles and bench bottles.
Making up and holding large batches of dilute salt or buffer solutions for class practicals.
Collecting aqueous waste for neutralisation or disposal, clearly labelled and kept separate from water carboys.
Carrying water samples or process liquids between a field site and the lab.

Why Choose LabEquip

Carboys like this one are ordered mainly by labs that use water or buffer in volume: school chemistry departments, water-testing labs and microbiology teaching labs. LabEquip can supply the carboy together with smaller narrow mouth plastic bottles for bench use; the Lab Glassware category lists other containers, and you can send your capacity requirement to our team.

Frequently Asked Questions

What is the difference between a carboy and a large reagent bottle?

A carboy is designed for bulk volumes and usually stays in one place as a reservoir, often with handles and sometimes a bottom tap. A reagent bottle is smaller and poured by hand at the bench. Labs typically fill bench bottles and wash bottles from the carboy.

Can a plastic carboy be autoclaved?

It depends on the polymer. Polypropylene carboys are generally autoclavable, while polyethylene softens at autoclave temperatures and usually is not. Check the rating of this carboy first, and always loosen the cap during the cycle.

Is a plastic carboy suitable for distilled or deionised water?

Yes, this is one of its most common uses. Keep it closed to limit dust and carbon dioxide uptake, store it away from sunlight to discourage algae, and periodically empty, rinse and refill it rather than topping up indefinitely.

Can organic solvents be kept in the carboy?

Only with care. Polyethylene and polypropylene resist alcohols and many aqueous chemicals, but aromatic and chlorinated solvents such as toluene, xylene and chloroform can swell or permeate them. Keep those in containers rated for solvents.

How do I clean the inside of a carboy?

Wash it with warm water and a mild laboratory detergent, using a long-handled brush to reach the shoulders and base. Rinse several times with tap water, finish with distilled water, and drain it inverted with the cap off.

Is it safe to lift a full carboy?

Water weighs about one kilogram per litre, so even a moderate-sized carboy is heavy when full. Keep it on a low, stable shelf or on the floor near where it is used, and move it with a trolley or two people when full.

Last Updated: September 2026

Carboy With Stop Cock, Plastic

Quick Answer: A plastic carboy with stopcock is a large, handled storage container with a tap fitted near its base, used to hold distilled water, buffers or stock solutions and dispense them by gravity. The tap removes the need to lift and tip a heavy, full vessel.

How a Tap-Fitted Carboy Changes the Bench Routine

A full carboy is heavy, and pouring from one means lifting it, tilting it and hoping the stream lands in the neck of a small bottle. Fitting a stopcock low on the body turns the carboy into a reservoir that stays put on a shelf or bench edge. Students fill beakers and measuring cylinders by opening the tap, and the bulk liquid is never disturbed or contaminated by pipettes and funnels dipped into it.

The listing photo is of a polypropylene carboy with moulded handles, while the title itself says only plastic, so the resin and the stopcock material should be confirmed. Polypropylene containers are generally autoclavable at 121 °C and high-density polyethylene ones generally are not, which matters if the carboy will hold sterilised water. Either plastic copes well with dilute acids, alkalis and aqueous salt solutions.

A carboy without a tap, such as the plain plastic carboy in the Lab Glassware range, suits long-term storage and transport; this version suits daily dispensing. Loosen the top cap slightly while the tap is running, otherwise air cannot replace the outflowing liquid and the flow slows to a glug.

Applications

Holding the day’s supply of distilled or deionised water in a teaching lab, so that wash bottles are refilled straight from the tap
Storing prepared buffer or dilute stock solutions, such as physiological saline for biology practicals
Collecting water from a still or deionisation unit and dispensing it where it is needed
Supplying one reagent, for example limewater, to a whole class without repeated pouring from a large bottle

Specifications

Item	Carboy with stopcock (tap) near the base for dispensing
Material	Plastic, as titled; the listing photo shows polypropylene
Handles	Moulded carrying handles, as seen in the listing photo
Dispensing	Gravity flow through the stopcock, with the cap vented
Capacity	Confirm at enquiry

Care & Handling

Stand the carboy with the stopcock overhanging the shelf edge or on a raised block, so a beaker or bottle fits beneath the tap.
Check the stopcock for drips after the first filling and before leaving the carboy unattended overnight.
Clean with dilute laboratory detergent and rinse well; for distilled water, a periodic drain and rinse limits algal or bacterial film on the walls.
Keep organic solvents out of the carboy until both the resin and the stopcock seals have been checked against the solvent.

Why Choose LabEquip

Lab technicians and school science departments buy carboys like this to keep a bulk supply of water or reagent in one place. LabEquip lists it with other chemistry lab equipment; to confirm capacity and material for your storage needs, write through the contact page.

Frequently Asked Questions

Why does the flow slow down after the tap has been open for a while?

Liquid leaving the tap must be replaced by air entering at the top. If the cap is screwed down tightly, a partial vacuum forms inside and the flow becomes weak and irregular. Loosening the cap a quarter turn, or fitting a vented cap, restores a steady stream.

Can a plastic carboy with stopcock be autoclaved?

Polypropylene carboys generally withstand autoclaving at 121 °C, but polyethylene ones generally do not, and the stopcock parts must also tolerate the heat. Confirm the material of both before autoclaving, and always loosen the cap so pressure can equalise.

Is it suitable for storing distilled water long term?

Yes. Plastic carboys are widely used for distilled and deionised water. Keep the cap on to reduce dust and carbon dioxide uptake, and empty, rinse and refill the carboy regularly rather than topping it up indefinitely.

Which liquids should not be kept in a plastic carboy?

Avoid strong oxidising acids such as concentrated nitric acid, and many organic solvents, including chlorinated and aromatic ones, unless the plastic is known to resist them. Aqueous solutions, dilute acids and dilute alkalis are the usual contents.

How should the carboy be placed for dispensing?

Set it on a stable shelf or raised platform with the tap clear of the edge, so a receiving vessel can sit underneath. Never move a full carboy by the stopcock or lift it above shoulder height; move it empty and fill it in place.

How is the carboy cleaned?

Drain it through the tap, rinse with warm water and a mild laboratory detergent, then rinse several times with distilled water. Open and flush the stopcock during cleaning so detergent does not remain in the tap body.

Last Updated: September 2026

Bottles for Tissue Culture Filter Cap

Quick Answer: Bottles for Tissue Culture Filter Cap are culture bottles whose screw cap carries a hydrophobic membrane vent. These tissue culture bottles with filter cap let carbon dioxide and oxygen pass while the cap stays fully closed, so cell and plant cultures can breathe without an open gap at the thread.

How a Filter Cap Vents a Culture

The filter cap has a small window in its top covered by a hydrophobic membrane, a porous film whose pores are fine enough to hold back bacteria and fungal spores. Gases diffuse through it freely; liquid and airborne microbes do not. With the cap screwed fully home, a culture in a CO2 incubator still equilibrates with the incubator air, so there is no need to judge how far to loosen a plain closure.

Keeping the cap tight has practical benefits. Bottles can be moved between incubator, cabinet and microscope without re-tightening, spills stay contained if a bottle tips, and moisture cannot wick in along a loose thread. In plant micropropagation, vented closures also let ethylene and excess humidity escape, conditions linked to glassy, water-soaked (hyperhydric) shoots in sealed vessels.

The vent works only while the membrane stays dry. If medium splashes onto it, the pores fill with liquid, gas exchange stops and the wetted filter can become a route for contamination, so keep the bottle upright and fill well below the neck. For closed cultures, or roller work outside a CO2 incubator, the plain-cap Bottles for Tissue Culture are the alternative.

Applications

Routine subculture of adherent and suspension cell lines in a CO2 incubator
Plant shoot multiplication and rooting stages, where vented vessels reduce humidity and ethylene build-up
Teaching aseptic technique, since students never need to judge how loose a cap should be
Short culture runs where bottles move between incubator, microscope and cabinet several times a day

Specifications

Type	Culture bottle with vented screw cap
Vent	Hydrophobic membrane filter set into the cap
Purpose of vent	Sterile gas exchange with the cap fully closed
Suited to	CO2 incubator cell culture, plant micropropagation
Volume, membrane rating and sterility	Confirm at enquiry

Handling the Vented Cap

Keep the membrane dry: avoid inverting or shaking the bottle hard, and leave generous headspace
Do not cover the vent with film or tape, and do not soak it with ethanol, as both interfere with gas flow
Hold the cap by its sides, not the vent window, when opening it in the cabinet
Autoclave used bottles with their contents before disposal or washing

Why Choose LabEquip

Cell culture labs, plant biotechnology units and colleges teaching aseptic technique choose filter-cap bottles because a vessel that is fully closed yet still breathing cuts contamination during student handling. Related culture ware is listed under Biology Lab Products; send volume and quantity needs to our contact page.

Frequently Asked Questions

What does the filter in the cap do?

It lets gases such as carbon dioxide and oxygen move in and out of the bottle while keeping bacteria, fungal spores and dust out. This allows the cap to stay fully closed during incubation.

Should a filter cap be loosened in a CO2 incubator?

No. The vent already provides gas exchange, so the cap is screwed fully closed. Loosening it defeats the purpose of the membrane and exposes the thread to contamination.

What happens if the filter gets wet?

A wet hydrophobic membrane stops passing gas, and the culture’s pH may drift. The wet filter can also wick microbes inward, so transfer the culture to a fresh sterile bottle if medium has soaked the vent.

Why are vented vessels used in plant tissue culture?

Sealed vessels trap humidity and the ethylene released by plant tissue, which can cause glassy, water-soaked shoots and poor rooting. A vented closure lets these escape, which often gives sturdier plantlets for hardening off.

Can filter cap bottles be autoclaved?

Only if both the bottle and the cap membrane are rated for it. Many filter caps are intended for single use, and autoclaving can damage the membrane or its seal, so check the rating before reusing them.

When is a plain cap bottle a better choice?

Plain caps suit closed cultures that do not rely on incubator carbon dioxide, transport of cultures, and roller bottle work outside a CO2 incubator. They also avoid the risk of a wetted membrane when bottles are handled at an angle.

Last Updated: September 2026

Bottles for Tissue Culture

Quick Answer: Bottles for Tissue Culture are culture vessels, made in clear plastic or glass with a screw cap, in which animal cells or plant tissues are grown in sterile medium. The title of these tissue culture bottles names no filter vent, so gas exchange depends on how the cap is set.

Culture Bottle Formats and Closed Caps

Tissue culture bottles come in several formats. Roller bottles are long cylinders laid on their side on a slowly turning roller apparatus, so adherent cells growing around the whole inner wall are bathed in a shallow layer of medium in turn; they give a large growth surface per bottle for producing cells or virus stocks. Straight or square screw-cap bottles are used for suspension cultures, for plant micropropagation on gelled medium, and for keeping sterile media.

A cap without a filter works as a closed system. In a CO2 incubator the usual practice is to leave it a quarter-turn loose so carbon dioxide can reach the medium and hold the bicarbonate buffer at the right pH, then tighten it before the bottle is moved. Fully closed, the bottle suits cultures buffered with HEPES, transport between rooms, and roller cultures run outside a CO2 incubator. Where a loose cap is a contamination worry, the filter cap version replaces the gap with a membrane vent.

Bottles for animal cell culture are normally supplied sterile, with the inner surface treated so that cells attach, whereas plant culture vessels are often washed and autoclaved for reuse. Which of these this listing is, and its volume, is worth settling before ordering, because it decides how the bottles will be cleaned and sterilised.

Specifications

Type	Culture bottle with screw cap
Cap	Closed cap; no filter vent is named in the title
Cultures grown	Animal cell lines, plant tissue and callus
Used with	CO2 incubator, roller apparatus, laminar airflow cabinet
Format, volume, sterility and surface treatment	Confirm at enquiry

Uses in Cell and Plant Culture Labs

Expanding adherent cell lines on a roller apparatus for research or teaching production runs
Growing suspension cultures of cells or microorganisms in liquid medium
Micropropagation of plant shoots and callus on gelled medium in biotechnology practicals
Keeping prepared sterile media and buffers in the cold room

Aseptic Handling of Culture Bottles

Open bottles only inside a laminar airflow or biosafety cabinet, after wiping the outside with 70% ethanol
Never pour from the bottle neck over an open culture; use sterile pipettes so the rim stays dry
Inspect cultures daily for cloudiness or a colour change in the medium, early signs of contamination
Autoclave spent cultures before disposal, whatever the bottle material

Why Choose LabEquip

Biotechnology departments, plant tissue culture units and cell culture teaching labs order these bottles in batches for practical classes and routine subculturing, often alongside a tissue culture microscope for checking cells through the vessel wall. Browse the Biology Lab Products range or send quantities through our contact page.

Frequently Asked Questions

What is the difference between these bottles and the filter cap version?

These bottles close with a plain screw cap, so gas exchange happens only when the cap is left slightly loose. The filter cap version has a membrane vent in the cap, which lets gases pass while the cap stays fully closed, reducing the risk of contamination through the thread.

Why is the cap left loose in a CO2 incubator?

Most culture media use a bicarbonate buffer that needs carbon dioxide from the incubator air to hold a stable pH. A cap a quarter-turn loose lets that gas reach the medium; a tight cap would let the pH drift.

What is a roller bottle?

A roller bottle is a cylindrical culture bottle turned slowly on a roller apparatus. Adherent cells grow over the whole inner surface and are bathed in medium as the bottle rotates, giving much more growth area than a flask of the same footprint.

Can tissue culture bottles be reused?

Glass and polypropylene bottles are commonly washed and autoclaved for reuse, especially in plant tissue culture. Polystyrene cell culture bottles are generally single-use, because they soften at autoclave temperatures and their treated surface does not survive cleaning.

Are these bottles suitable for plant tissue culture?

Yes, screw-cap culture bottles are widely used for shoot multiplication and callus culture on agar-gelled media. For long cultures some labs prefer vented closures, which reduce humidity and ethylene build-up around the plantlets.

How should cultures in these bottles be checked?

Look at the colour and clarity of the medium daily without opening the bottle. Cloudiness, a surface film, or a sudden yellow or purple shift in a phenol red medium suggests contamination or a pH problem, and adherent cells can be viewed through the wall on an inverted microscope.

Last Updated: September 2026

Aspirator Bottle, Deluxe

Quick Answer: The Aspirator Bottle, Deluxe is a storage bottle with an outlet near its base, normally fitted with a stopcock or tap, so liquid can be drawn off by gravity without lifting or pouring. Labs keep it on the bench as a reservoir for distilled water, buffers, rinse solutions and prepared media.

How a Bottom-Outlet Bottle Works

An aspirator bottle is filled through its wide neck and emptied through a short side tube, the tubulation, moulded or fused just above the base. A tap on that outlet opens and closes the flow, so a technician can fill a wash bottle, measuring cylinder or beaker straight from the shelf. Because nothing is dipped into the liquid, the contents stay cleaner than a stock bottle that is opened and poured from all day.

The name recalls an older job. When liquid runs out of the outlet, air or gas is drawn in through the neck, and bottles of this kind were once used to pull gas slowly through absorption apparatus. Today the everyday use is dispensing, and the same vessel serves as a gravity reservoir feeding tubing to a rinse point or a piece of apparatus.

‘Deluxe’ is the range name in the title; the material (glass or heavy-duty plastic), the capacity and the type of tap are not stated. Set the bottle on a shelf or stand above the vessel being filled, since the flow rate depends on the height of liquid above the outlet. For bulk stocks, a plastic carboy is the usual next size up.

Care and Handling

Loosen the cap slightly while dispensing, or the flow slows as a partial vacuum forms above the liquid
Check the tap for drips after filling, and do not overtighten a plastic stopcock
Empty, rinse and air-dry the vessel regularly; standing water grows algae or biofilm, especially in light
Label the contents and date, and keep strong oxidisers and solvents out unless the material is rated for them

Where the Deluxe Aspirator Bottle Earns Its Place

Dispensing distilled water at the preparation bench for making up solutions and final rinses
Holding a buffer or wash solution for repeated use through a practical session
Storing saline or rinse water in microbiology and histology preparation rooms
Acting as a gravity-fed reservoir connected by tubing to apparatus
Demonstrating displacement, drawing air through apparatus as water runs out

Specifications

Type	Bottle with bottom outlet (tubulation) for dispensing
Outlet control	Normally a stopcock or tap on the lower outlet
Typical contents	Distilled or deionised water, buffers, dilute reagents, media
Filling	Through the top neck, then closed with its cap or stopper
Material, capacity and tap type	Confirm at enquiry

Why Choose LabEquip

Lab technicians and practical in-charges who prepare solutions for whole classes are the usual buyers, since a tap-fed supply on the prep bench saves lifting heavy stock bottles. The deluxe bottle sits in the Biology Lab Products range at LabEquip; tell us the capacity you have in mind through the contact page.

Frequently Asked Questions

What is an aspirator bottle used for?

It stores a liquid and dispenses it from a tap near the base. Most labs keep one filled with distilled water or a common buffer, so containers can be filled at the bench without pouring from heavy stock bottles.

Why does the flow slow down or stop when the tap is open?

As liquid leaves, air must enter at the top to replace it. If the cap is screwed down tightly, a partial vacuum forms and the flow stalls. Loosen the cap or use a vented closure while dispensing.

How is it different from a carboy?

Both store liquids, but this bottle is built around its bottom outlet and tap for dispensing, while a carboy is a larger storage vessel that may or may not have a tap. Bench dispensing bottles are sized for shelves; carboys hold bulk stock.

Can the bottle be autoclaved?

That depends on the material. A polypropylene body can generally be autoclaved at 121 °C if the cap is loosened, while polyethylene cannot. Check the ratings of the body and the tap before autoclaving, and remove the tap if it is made of a different plastic.

How often should the water be changed?

Distilled water left standing absorbs carbon dioxide from the air and can pick up microbial growth. Many labs empty, rinse and refill the bottle weekly, and more often for buffers or anything that supports growth.

Where should the bottle be placed?

On a stable shelf or stand above the level of the vessel being filled, away from direct sunlight. A higher liquid level gives faster flow, so keep the bottle raised but within easy reach of the tap.

Last Updated: September 2026

Molecular Model Set – Organic Stereo Chemistry Set – Teacher

Quick answer: The Organic Stereo Chemistry Model Set (Teacher) is a physical molecular modeling kit used to demonstrate enantiomers, diastereomers, and conformational isomers for advanced, institutional-level chemistry instruction.

This teacher-level set is built for visualizing complex, three-dimensional molecular arrangements that are difficult to convey with diagrams alone. It is intended for advanced instruction, helping educators physically model enantiomers, diastereomers, and conformational isomers so that students can see and manipulate stereochemical relationships directly rather than only reading about them. It is well suited to institutional laboratory teaching in organic chemistry, where an instructor needs a durable, reusable demonstration set for repeated classroom or lecture-hall use.

Fuller Description

Stereochemistry is a notoriously difficult topic to teach from two-dimensional textbook drawings alone, since concepts like chirality and conformation depend on spatial relationships that are easier to grasp by handling a physical model. This set is designed as a teacher/demonstration-grade kit, meaning it is intended to withstand frequent, repeated use across multiple classes or cohorts rather than a single student’s occasional use. It pairs naturally with a corresponding student-level set for institutions that want a consistent modeling system across both instructor demonstrations and individual student practice.

Specifications

Parameter	Detail
Product type	Molecular model set, teacher/demonstration grade
Concept coverage	Enantiomers, diastereomers, conformational isomers
Recommended level	Advanced / institutional chemistry instruction
Typical use	Instructor demonstration of 3D stereochemical relationships
Exact atom/bond piece count	Not specified for this listing — confirm with our sales team
Materials and construction	Not specified for this listing — confirm with our sales team
Case/storage format	Not specified for this listing — confirm with our sales team

Care & Handling

Store all atom and bond pieces in their original case or tray between uses so components are not lost.
Handle bond connectors gently when assembling and disassembling models to avoid stress-cracking over repeated use.
Wipe pieces clean with a dry or lightly damp cloth; avoid harsh solvents that can degrade plastic components.
Periodically check for wear, since this is a demonstration set intended for high-frequency institutional use.
Keep small pieces away from young children not directly supervised during the lesson.

Why Choose LabEquip

LabEquip supplies a full Educational Science Models range, including the companion Organic Stereo Chemistry Set (Student) for institutions that want matching teacher and student modeling kits. Visit our homepage to browse our complete catalog of classroom and laboratory teaching equipment.

Frequently Asked Questions

What is the Organic Stereo Chemistry Set (Teacher) used for?
It is used to demonstrate enantiomers, diastereomers, and conformational isomers for advanced, institutional-level chemistry instruction.

How is this different from the student version?
The teacher set is built as a demonstration-grade kit for repeated instructor use across classes, while the student set is intended for individual practice. Institutions often order both for a consistent modeling system.

How many atoms and bonds are included?
The exact piece count is not specified for this listing. Please confirm current contents with our sales team before ordering.

What level of chemistry course is this suited for?
It is designed for advanced or institutional-level organic chemistry instruction covering stereochemistry topics such as chirality and conformation.

Is this kit durable enough for repeated classroom use?
Yes, it is designed as a teacher/demonstration-grade set intended to withstand frequent, repeated institutional use, though we recommend periodic checks for wear.

Does LabEquip offer institutional or bulk pricing?
Yes. Contact our sales team at sales@thelabequipment.com for institutional quotations and bulk-order pricing.

Last Updated: September 2026