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Rubber Stopper

Rubber Stopper

Product Code : JL-LEP-10273

The Rubber Stopper (SKU JL-LEP-10273) seals 16 mm diameter test tubes and similar glassware. It is a tapered cylinder of premium grade SBR black rubber, at least 25 mm high with a 17 mm top and 13 mm bottom diameter, and it has a 5 mm bored hole for a glass tube or thermometer. With a hardness of 40 ± 5 Duro, the rubber stopper grips firmly yet can be pushed in and eased out without cracking the glass. Dimensions are held to ±0.5 mm. JaincoLab supplies it as per DepEd guidelines.

Specifications

The stopper is specified by shape, material, size and hardness: tapered cylinder of SBR black rubber, at least 25 mm high, 17 mm top and 13 mm bottom diameter, a 5 mm hole, ±0.5 mm tolerance and 40 ± 5 Duro.

ProductRubber Stopper
SKUJL-LEP-10273
ShapeCylindrical with a tapered bottom end
MaterialPremium grade SBR black rubber compound
Height25 mm (min)
Top diameter17 mm (min)
Bottom diameter13 mm (min)
Hole diameter5 mm (min)
Tolerance±0.5 mm on height, top and bottom diameter
Hardness40 ± 5 Duro
Specification referenceAs per DepEd guidelines

Applications of the rubber stopper

The stopper is used to close test tubes while passing a tube or thermometer through. Typical uses are:

  • Sealing 16 mm test tubes
  • Fitting delivery tubes for gas collection
  • Holding a thermometer in a boiling tube
  • Closing small glassware in simple set-ups

Scope of supply and ordering

The listing covers rubber stoppers as described in the specification table; quantities per pack are confirmed on the quotation. Tubing and test tubes are separate items.

Minimum order quantity, packing and lead time are confirmed on the quotation for the quantity and destination. JaincoLab supplies schools, colleges and education projects, and exports to Africa, the Middle East and South and South-East Asia.

Frequently asked questions

Which tubes does the Rubber Stopper fit?
16 mm diameter test tubes and similar glassware.

How large is the hole?
5 mm.

What is it made of?
Premium grade SBR black rubber, 40 ± 5 Duro.

Related products

Related items:

Browse Laboratory Equipment Products or the JaincoLab chemistry lab equipment range.

Request a quote

To order the Rubber Stopper, send the quantity and delivery destination through the JaincoLab contact page or email [email protected]. Tender and project enquiries can be sent through the tenders page.

Last updated: September 2026

   
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Office Address

Jain Scientific Suppliers
2475-84, Hargolal Road,
Ambala Cantt, Haryana, India

[email protected]

+91-85699-09696

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