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  • Sani-Tech® ultra-pure platinum-cured silicone stoppers outperform standard neoprene and rubber stoppers in critical laboratory and process applications. These long-life silicone stoppers are fully autoclavable and sterilizable and will not crack, spallate or invoke particle migrations that can…

  • Size No. 000, 00 and 0 have hole 3 mm diameter; sizes No. 1 and 2 have hole 4 mm in diameter; all other sizes have hole 5 mm in diameter.

  • … Can be steam sterilized at 15 lbs. pressure, making them suitable for culture tubes containing pathogenic materials Length: 25 mm Not recommended for use with concentrated acids, bromine, carbon tetrachloride, butanol, iso-propanol or toluene. Packaged in a bag of 12 stoppers.

  • Rubber Stoppers

    United Scientific Supplies

    Rubber Stoppers packaged in convenient 1lb bags. Available in solid, 1 hole, and 2 hole versions.

  • Silicone Stoppers with Holes

    DWK Life Sciences (Kimble)

    General purpose single-hole silicone rubber stoppers. Steam autoclavable Opaque yellowish-white color Stoppers are manufactured from pure silicone rubber

  • Standard Grade Sizes No. 00, 0 and 1 have holes 2, 3 and 4 mm diameter, respectively; all other sizes have holes 5 mm diameter

  • Standard Grade Size No. 000 is 18 mm long; sizes No. 00 to No. 13 are 25 mm long. Sizes No. 13 1/2, 14 and 15 are 35 mm, 36 mm and 39 mm respectively.

  • Neoprene Stoppers

    United Scientific Supplies

    Neoprene stoppers can be used in areas where rubber would be attacked by reagents or solvents. Synthetic neoprene stoppers have good resiliency and shelf-life. They withstand petroleum products and oils as well as most inorganic acids and bases. Stopper are green for easy identification. Sold by the…

  • Hexagonal shaped head of stopper prevents it from rolling off of the bench top. Flat surface will also permit stopper to be inverted and placed on end, thereby preventing possible contamination of ground surface.

  • Black Rubber Stoppers

    GSC International, Inc.

    A black rubber stopper that is useful in a number of applications. Available in a variety of sizes. Each pack is one pound. Choose from solid, 1 hole, and 2 hole stoppers.

  • Rubber Stoppers

    United Scientific Supplies

    Convenient assortments of various sizes of rubber stoppers in 1lb bags.

  • Stopper

    DWK Life Sciences (Kimble)

    These stoppers are used as an accessory for microscale threaded Standard Taper 14/10 kits. Pennyhead stopper sizes 10/18 through 19/22 are solid borosilicate glass Sizes 24/25 and larger are hollow borosilicate glass Manufactured from 33 expansion, low extractable borosilicate glass…

  • Glass Pennyhead Stoppers

    DWK Life Sciences (Kimble)

    Solid pennyhead stopper for volumetric flasks, centrifuge tubes, etc. Meets ASTM Standard E 694.

  • Unique seal system allows use as solid or one-, two- or three-hold closures Simplifies stock room inventory Molded of soft, resilient, white natural rubber Seals vacuum-tested to 760 mm Hg Autoclavable, with good shelf life. Sizes #3 & #4 have two holes; #5 - #10 have the (3)…

  • Similar to CG-3026 and CG-3027 except with two holes. These stoppers are suitable for practically all general laboratory uses. Composition ensures resiliency and pliability over a long period and withstands laboratory conditions without hardening. The dimensions are in accordance with specifications…

  • Rubber Stoppers


    …for added chemical resistance Listed mainly by trade-size, available in solid, one-hole, and two hole rubber stoppers. Uses vary widely, some are outlined below: Carboy Stoppers Crucible Holders Laboratory & Test Tube Stoppers Masking Applications Micro Stoppers Pipe Plugs Tube Stoppers

  • …to temperatures up to  120°C Usable with petroleum products, vegetable and mineral oils and fats which deteriorate natural rubber Standard length: 26 mm Increased functionality over rubber stoppers at elevated temperatures. Not recommended for use with very light oils, such as kerosene.

  • Stopper Assortment


    Made of soft, pliable, black-compounded stock Length: 25 mm Includes stoppers of solid, one-hole and two-hole styles in sizes 00, 0, 1, 2, 3, 4, 5, 6, 6 1/2, 7 and 8; total of 66 stoppers

  • Assorted Rubber Stoppers (2 Pound)

    GSC International, Inc.

  • Interlocking Glove Rack

    Argos Technologies

    Interlocking wire glove racks are made from epoxy coated steel. Wire stoppers on the racks prevent boxes from slipping out, which means these racks can be placed vertical or horizontal. Interlocking glove racks are supplied with screws, and are designed to fit most major brands of gloves. 10-1/4 x 7…

  • Serum Bottle Stoppers

    DWK Life Sciences (Wheaton)

    …volatile extractables from the rubber component. Butyl stoppers have very low extractable formulations for use with liquid, lyophilized or dry powder products needing protection from oxygen or moisture vapor penetration. Teflon-coated stoppers provide an inert barrier to minimize interaction between…

  • Inexpensive, tapered stopper provides for a tight, leak-proof fit while the top ring permits the stopper to be easily removed. Stoppers are made of yellow Polyethylene

  • Polyethylene Stopper Caps

    Evergreen Scientific

    Polyethylene stopper caps to fit a variety of general purpose test tubes

  • PennyHead Glass Hollow Stoppers

    Across International

    Ai 24/40 pennyhead glass hollow stopper. Glass material: high borosilicate glass 3.3.

  • 20mm Snap On Stoppers

    J.G. Finneran

  • …PYREX® stoppers are made from linear high-density polyethylene and have closed bottoms to conform to Standard Taper stopper dimensions. The three rings on the plug provide an efficient seal. This improved design fully protects the neck in the event of accidental tipping. These stoppers may be…

  • PTFE Stopper, Flask Length, Synthware, Various Joint Sizes Available.

  • Recommended where natural rubber would deteriorate or be attacked.

  • PTFE Stoppers


    Flask length PTFE stopper with color coded handle.

  • …a double seal .Septa area allows insertion of needle, with excellent re-sealing properties for air sensitive chemistry Standard Compounds include Red and White Natural Rubber, Gray Butyl on select sizes Custom Sleeve Stopper Compounds available: EPDM, Nitrile, Neoprene, Silicone and Viton®

  • Flange Style Rubber Stopper

    DWK Life Sciences (Wheaton)

    Cleanest, most precise pharmaceutical grade rubber stoppers for research and parenteral drug applications Readily punctured with syringe needle 1229H84-K77, 1223Z64-65, 1780K28-31: straight plug style 1229K78, 1780K33-35: 2 leg lypohilization style 1780J10-J14: sleeve style

  • Scienceware® Cup Type Stoppers

    Bel-Art - SP Scienceware

    …also be inverted for use as loose or tight-fitting caps. Smooth inside walls and flat bottoms permit use as containers. Length of all sizes: 25 mm. Stopper sizes, corresponding generally to standard numbering of laboratory rubber stoppers and top x bottom o.d. in millimeters are shown in listings.

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