Stoppers
Stoppers, also known as bungs, are used to give an airtight seal to laboratory flasks and test tubes by fitting tightly inside the neck of the container and preventing material from spilling. Stoppers can be made of glass, cork, rubber, or silicone. They are typically designed with a conical shape, but straight, flanged, and tapered options are also available.
Stoppers are the preferred choice for many applications requiring a tighter seal or a greater degree of chemical resistance. They also provide a good seal when a solution needs to be shaken or mixed without spilling. Stoppers are generally cylindrical in shape and have a tapered bottom end. They may be marked with a stopper number or size on the top and bottom diameters of the stopper. Sizing can vary among manufacturers.
Stoppers are available in a solid design or with holes known as positions placed in the top. Positions allow easy access to the material contained in the sealed vessel by pipettes, tubing, or other equipment without full removal of the stopper.
What Types of Stoppers Are Available?
• Turnover stoppers have external serrations to create an excellent internal seal combined with a flexible turnover sleeve that folds down over the container’s neck to create a double seal
• Serum bottle or vial stoppers have two or three legs with external serrations or straight sides and a flanged top to create an airtight seal
• Straight bromobutyl plug-type stoppers provide a maximum seal for vials and serum bottles with a straight-wall glass finish
• Ultra-pure, straight bromobutyl plug-type stoppers provide high chemical purity and low gas permeability. They offer excellent performance during freeze drying processes such as lyophilization, where stoppers must remain stable during transfer and sublimination phases
• Silicone recessed septa stoppers are non-toxic and have external serrations to create an effective internal seal
Ace Glass, Inc. 29/42 Bent Vertical Hose Barb Vacuum Trap Stopper
29/42 Bent Vertical Hose Barb Vacuum Trap Stopper
Ace Glass, Inc. 50/50 Bent Vertical Hose Barb Vacuum Trap Stopper
50/50 Bent Vertical Hose Barb Vacuum Trap Stopper
Chemglass Life Sciences Foam Plug, fits 66-75mm Openings
Foam Plug, fits 66-75mm Openings. Identi-Plugs are for use with test tubes and flasks. They are reusable and leave no clinging fibers like cotton plugs. They provide a snug fit, yet permit free air flow. Plugs are ideal for use with Drosophila vials. They spring back to original shape after repeated use. Identi-Plugs can also be used as a cleaner for lab pipettes, tubes, vials, as well as industrial precision tubing. Plugs are approximately 1.75" long.
Chemglass Life Sciences Vacuum Trap, O-Ring Style, Stopper Only, #40 O-Ring Joint
Vacuum Trap, O-Ring Style, Stopper Only, #40 O-Ring Joint. Stopper for use with the CG-4513-11 vacuum trap. Image shown is the full vacuum trap, but this item is the STOPPER ONLY.
West Pharmaceutical Services Inc 20mm Serum FluroTec™ Barrier Film-Laminated Ready-to-Sterilize Bromobutyl 4023/50 Stoppers with Envision™ Verification Process, Qty. 3,000 stoppers/bag
FluroTec™ barrier film-laminated serum stoppers are made from 4023/50 a bromobutyl elastomer and laminated with FluroTec™ barrier film to reduce the risk of a chemical interaction. These components are provided washed (ready-to-sterilize) and 100% vision inspected. This stopper configuration can be used with European blowback, North American blowback, or straight wall (no blowback) vials. West item number:10145417.
Sigma Aldrich Fine Chemicals Biosciences Precision SealR rubber sep
The recommended choice for use with organic chemicals and solvents pressure applications and cannulation techniquesPrecision Seal septa are designed specifically for the rigorous requirements of chemical applications.Precision fit Precision Seal septa have a longer tapered plug that seats firmly inside the glass joint or tube providing a sealing surface that is 50 to 80% greater than standard sleeve stoppers. The inner seal design of Precision Seal septa minimizes chemical and solvent vapor migration up the joint to the sleeve which can swell leak or fail from exposure. The surface texture of the rubber is similar to that of a ground glass joint and resists movement once seated.Non-contaminating Precision Seal natural rubber is lower in solvent extractables 1.9% vs. standard sleeve stoppers 5-6%. Precision Seal rubber is higher in density to minimize the effects of solvent degradation. They are manufactured from a single certified lot for absolute consistency.Safet
Research Products International Corp Laboratory Grade Rubber Stoppers with Hole, BLK SBR Rubber, Size #12, 64 x 54 x 25mm, 5 per Package
Laboratory Grade Rubber Stoppers with hole are offered in a wide range of common sizes for most laboratory applications. Available standard black SBR rubber. Material can typically withstand temperatures up to about 100°C (212°F). Rubber stoppers with hole are molded in the USA according to standard industry size specification.
Packaged in approximately one pound packages.
Cole-Parmer Solid Color-Coded Silicone Stoppers, Standard Size 8, Green; 10/Bag
Silicone bubbles make these stoppers lightweight—they float on water. Withstand temperatures from –76 to 392°>F (–60 to 200°>C). Stoppers are available in 14 color-coded sizes, given in both standard and Japanese size numbers. Softness and flexibility allow stoppers to fit a range of holes. Easily make openings for glassware fit your exact specifications with the optional cork borer set. 2 bg/cs.*
Ace Glass, Inc. 40/50 Bent Vertical Hose Barb Vacuum Trap Stopper
40/50 Bent Vertical Hose Barb Vacuum Trap Stopper
Ace Glass, Inc. 34/45 Bent Vertical Hose Barb Vacuum Trap Stopper
34/45 Bent Vertical Hose Barb Vacuum Trap Stopper