Stoppers

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  • Solid Silicone Stoppers

    Free from volatiles or extractable substances which may impair cell growth; for use at temperatures from -80 to 450°F 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…

  • Rubber Stoppers

    Plasticoid

    M35 Green Neoprene 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…

  • Solid Rubber Stoppers

    Plasticoid

    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.

  • Two Hole Rubber Stoppers

    Plasticoid

    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

  • 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.

  • Twistit Convertible Stoppers

    Plasticoid

    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)…

  • Septum Stoppers, Sleeve Type

    Chemglass

    Sleeve type stoppers with a hollow plugs and sleeve extensions that folds down over the neck of a vessel, tubing, etc. The diaphragm can be punctured with a syringe needle, re-sealing after the needle is withdrawn. Available in either RED or WHITE rubber.

  • KIMAX Brand Joint Stoppers

    DWK Life Sciences (Kimble)

    Borosilicate, with penny head Conforms to ASTM Standard E 675 Size Standard Taper 13 has solid plug; size Standard Taper 38 has recessed bottom Standard Taper designation indicates the approximate diameter of the ground zone at its widest (gauging) point.

  • Scienceware® Safe-Lab® Teflon® PTFE Stoppers for Tapered Joints

    Bel-Art - SP Scienceware

    Safe-Lab™ solid Teflon® PTFE plastic stopper with threaded polypropylene extracting nut is easily removed by turning the red extraction nut to apply a safe, gentle and even force against the mouth of the vessel.  For use with separatory funnels and volumetric flasks Helps…

  • Key-Head Color-Coded Medium Length PTFE Stoppers

    DWK Life Sciences (Kimble)

    Stoppers are used with laboratory glassware such as flasks and separatory funnels. PTFE has excellent chemical resistance and resists freezing in ground glass joints Remove the colored polyethylene handle from the PTFE stopper before cleaning or exposing to temperatures above 80 °C …

  • Snap-On Stoppers

    DWK Life Sciences (Wheaton)

    Natural red rubber or gray chlorobutyl/45 material 7 x 13 or 13 x 20 mm sizes

  • 11 mm Stopper, Sleeve (5X11) Red Rub

    DWK Life Sciences (Wheaton)

    Sleeve stoppers are plug stoppers with fold-over skirts Used on serum vials and other crimp-finish containers that do not require aluminum seals or overcaps Can be used as an injection site for multiple dose entry Manufactured from natural red rubber, a general-purpose rubber…

  • Plug-Type Rubber Sleeve Stoppers

    DWK Life Sciences (Kimble)

    Uses include outgassing NMR tubes, pressure venting or adding reactants via syringe. Hollow, plug-type stopper fits into the neck of the glassware apparatus Sleeve extension fits over the neck for a secure seal Diaphragm can be punctured with a syringe needle Series 774261 may be…

  • NMR Stoppers

    Plasticoid

    Hollow plug to fit inside bottles, flasks, vials, or tubing with a sleeve to pull over neck to create 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…

  • #12 Silicone Rubber Stoppers

    DWK Life Sciences (Kimble)

    This rubber stopper is an accessory for Kimble 4L flasks 27060-4000, 27065-4000, and 27070-4000, as well as 90mm funnnel 953805-0090.

  • PYREX® PTFE Standard Taper Keyhole Stoppers, Color-Coded

    Corning

    These chemically resistant PYREX® keyhole stoppers are made from polytetrafluoroethylene (PTFE) and conform to Standard Taper stopper dimensions. The color-coded keys make sorting and selecting the correct size much faster and easier. These stoppers may be used in place of conventional glass…

  • Stopper Pressure Relief

    Glas-Col

    With a patented Glas-Col Snorkel Stopper, you'll never again have to take time to open the stopcock and relieve pressure when vigorously shaking a separatory funnel, because our Snorkel Stopper does the task automatically. If you use a Glas-Col shaker, you can simply load the funnels onto it…

  • Rubber Stoppers

    United Scientific Supplies

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

  • 24 MM Septa, PTFE/Sil/PTFE, 10/80/10

    DWK Life Sciences (Wheaton)

    Made of PTFE/Silicone/PTFE For use with screw caps or seals Autoclavable

  • PYREX® Polyethylene Standard Taper Stoppers

    Corning

    These blue and white 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…

  • 20MM SEPTA, RED SILICONE

    DWK Life Sciences (Wheaton)

  • 30 MM STOPPER, ST PLUG (16X30) GRY BUTYL

    DWK Life Sciences (Wheaton)

  • 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…

  • Septum Stoppers, Suba-Seal®

    Chemglass

    Suba-Seal® septa are a flanged stopper with a hollow plug and sleeve extension that folds down over the neck of the vessel. In addition to the pull over sleeve, Suba-Seal® stoppers have a series of annular serrations on the plug portion of the septa. Each of these serrations depress along…

  • Glass Pennyhead Stopper, Standard Taper 24/40

    DWK Life Sciences (Kimble)

    Hollow plug type With sealed bottom and vertical penny head

  • 28MM STPR, 2 LEG LYO (20X28) BUTYL GRY

    DWK Life Sciences (Wheaton)

  • 15 MM SEPTA, TFE/SIL

    DWK Life Sciences (Wheaton)

  • SYNTHWARE Flask-Length PTFE Stoppers

    Kemtech America

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

  • Safe-Lab® Joint Stirrer Bearings

    Bel-Art - SP Scienceware

    Includes two replacement PTFE bushings. Not autoclavable. Fits stirring rods with 10mm diameter. Includes extraction nut to effortlessly remove stopper from flask

  • Assorted Rubber Stoppers (1 Pound)

    GSC International, Inc.

  • SYNTHWARE Solid Glass Penny-Head Stoppers

    Kemtech America

    Penny-Head Stopper, Glass, Solid, Synthware, Various Joint Sizes Available.

  • Assorted 2 Hole Rubber Stoppers

    GSC International, Inc.

    RS-2H-C 1 pound package of assorted 2 hole rubber stoppers. Sizes and quantities are as follows: Size 2: 3 each Size 3: 3 each Size 4: 3 each Size 5: 3 each Size 6: 3 each Size 7: 3 each Size 8: 3 each

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