In Stock
Reagent Bottle With Screw Cap
Standardized GL-45 Neck Threading: Equipped with high-durability, blue polypropylene screw caps and integrated pouring rings that facilitate drip-free liquid transfer and provide a hermetic, leak-proof seal for volatile or hygroscopic substances.
Thermal-Shock Resistant Borosilicate Matrix: Features a specialized low-expansion glass composition (3.3 x 10-6 K-1) capable of withstanding repetitive autoclaving cycles and extreme temperature gradients without compromising molecular glass stability or transparency.
$11.51
Quick Answer: A reagent bottle with screw cap is a laboratory storage bottle closed by a threaded cap instead of a ground-glass stopper. It holds prepared solutions, buffers and stock reagents with a closure that stays put when the bottle is carried, shaken or kept for weeks.
How a Threaded Closure Changes Reagent Storage
A reagent bottle with screw cap solves a problem that stoppered bottles leave open. A push-in stopper can lift when a bottle is tipped, and a ground-glass stopper can freeze in its neck. A threaded cap is tightened by hand and released by hand, so the bottle can travel from the preparation room to a class bench, or be shaken to mix its contents, without the closure working loose.
Caps on laboratory bottles of this kind are normally plastic, and many carry a liner or a drip-free pouring ring. Neither the thread size, the cap material nor the body material is stated in this listing, so these should be confirmed when ordering, particularly if the bottle will hold organic solvents, which can soften some cap plastics, or will be sterilised in an autoclave.
In teaching and research laboratories the screw-cap bottle is usually the working container for anything made up in bulk and used over several sessions: buffer solutions, standardised acids and alkalis, indicator solutions and culture media. A clear label with name, concentration, date and initials turns it into a traceable stock rather than an anonymous jar.
Specifications
| Item | Reagent bottle with a threaded screw cap |
| Closure | Hand-tightened screw cap; cap material not stated in the listing |
| Intended use | Storage and transport of prepared solutions and stock reagents |
| Typical contents | Buffers, standard solutions, indicators, culture media |
| Capacity, thread size and body material | Confirm at enquiry |
Applications
- Keeping standardised sodium hydroxide or hydrochloric acid for a run of titration practicals
- Storing the buffer solutions used to calibrate pH meters
- Holding prepared media or rinsing solutions in microbiology and biochemistry work
- Sending measured reagents from a central preparation room to several laboratories
Care & Handling
- Before autoclaving any screw-cap bottle, loosen the cap by about a turn; a tightly closed bottle heated in steam can build pressure and crack.
- Wipe the thread clean before closing, since dried salt or syrupy residue on the thread makes the cap stick and stops it sealing.
- Check caps and liners from time to time for cracking or swelling, especially where solvents or strong oxidisers are stored.
- Keep heavy filled bottles on low shelves with the label facing outwards.
Why Choose LabEquip
Laboratory technicians and school preparation rooms order screw-cap bottles when a solution is made once and used for weeks. LabEquip lists this bottle in its chemistry lab equipment range together with stoppered patterns such as the narrow mouth reagent bottle; tell us the capacities and quantities you need through the LabEquip contact page.
Frequently Asked Questions
When should I choose a screw cap instead of a glass stopper?
Choose a screw cap when the bottle will be carried, shaken or stored for long periods, or when the contents are alkaline. A ground-glass stopper can seize on alkali solutions and can fall out if the bottle tips, whereas a threaded cap stays in place and opens without force.
Can a screw-cap reagent bottle be autoclaved?
Only if both the bottle and the cap are rated for steam sterilisation, which should be checked for the version supplied. When autoclaving, loosen the cap so pressure can escape, and tighten it only after the bottle has cooled.
Is the cap suitable for organic solvents?
Cap plastics differ. Polypropylene caps handle most aqueous acids and alkalis but may swell or soften over time with some solvents, such as chlorinated or aromatic liquids. For solvent storage, a cap with a chemically resistant liner is the usual choice.
How full should a stock solution bottle be filled?
Leave some headspace, roughly a tenth of the volume, so the liquid can expand with temperature and the bottle can be shaken to mix. Completely full bottles are harder to pour from and more likely to leak at the thread.
Why does a sodium hydroxide solution change on storage?
It slowly absorbs carbon dioxide from air, forming sodium carbonate and lowering its strength. A well-closed screw cap reduces this, but the solution should still be restandardised before accurate titrations if it has been stored for some time.
How do I label a stock solution properly?
Write the name of the reagent, its concentration, the date it was made, the preparer’s initials and any hazard warning. Place the label on the side opposite the one you pour from, so drips do not wash it off.
Last Updated: September 2026
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