STR4 Bottle Drum For Two 250 ML Bottles

Drum/support for 2 bottles of 250mL for Stuart STR4 rotary shaker

₹12,400.00

Quick Answer: The Drum/support for 2 bottles of 250mL is an STR4 bottle drum: a clear holder that clamps two 250 mL bottles on the Stuart STR4 rotary shaker so both bottles turn end over end together.

Two Bottles, End Over End

In the photo, two screw-capped laboratory bottles lie across a transparent drum mounted on the STR4 drive. As the drum turns, each bottle is inverted from cap to base, so a full 250 mL volume mixes gently and completely. That larger volume is the reason to choose a bottle drum over tube holders: an extraction, a resin wash or a batch of suspension can be handled in one vessel instead of many tubes.

Two positions also make the load easy to balance. Two bottles filled to the same level sit opposite each other, and when only one sample is needed, a second bottle filled with water to the same weight keeps the drive running evenly. For tilted or multi-tube mixing on the same drive, see the Drum bottle holder with adjustable tilt; the drive itself is the Rotary mixer STR4.

Bottle fit depends on outside diameter and length, which vary between makers of 250 mL bottles. Measuring the bottle you plan to use and checking it against the holder avoids a loose fit that would let bottles knock as they turn.

Specifications

Type	Bottle drum (support) for a rotator drive
Capacity	Two bottles of 250 mL, as titled
Drive	Stuart STR4 rotary shaker, as titled
Drum	Transparent, as pictured
Accepted bottle diameter and length	Confirm at enquiry

Applications

Extraction of solids with water or solvent in closed bottles, such as soil or plant material
Washing and equilibrating chromatography resins in bottle volumes
Keeping 250 mL suspensions of cells or particles uniform before dispensing
Leaching tests in which a solid is tumbled with liquid for a fixed time

Care & Handling

Close caps tightly and wrap threads with PTFE tape or film where a leak would be a problem.
Fill both bottles to the same weight, using water in a dummy bottle if only one sample runs.
Leave headspace in each bottle so the contents can move as it inverts.
Wipe the drum with mild detergent after use and keep solvents off the clear plastic.

Why Choose LabEquip

Environmental, food and soil-testing labs that already run the Stuart STR4 buy the bottle drum for volume work in 250 mL bottles. It is listed in General Lab Products; send your bottle type through the contact page to check the fit.

Frequently Asked Questions

Which bottles fit the drum?

It is made for two 250 mL bottles, and the photo shows screw-capped laboratory bottles in place. Bottle diameters differ between makers, so measure your bottle and compare it with the holder before ordering.

Can just one bottle be run?

Yes, but balance it. Fill a second bottle with water to the same weight and place it in the other position, so the drive turns smoothly.

How full should each bottle be?

No more than about three-quarters full, so the contents can fall from end to end as the bottle inverts. A bottle filled to the neck barely mixes.

How can leaks be prevented during rotation?

Tighten caps fully, check the seal inside the cap, and wrap the thread with PTFE tape or laboratory film for solvents. Run the drum slowly for a minute and inspect before leaving it.

Is it suitable for flammable solvents?

The drum only holds the bottles; the risk comes from the contents. Use sealed, solvent-compatible bottles, run in a ventilated area and keep ignition sources away.