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
Chemglass Life Sciences Vacuum Trap Stopper Only, 55/50
Vacuum Trap Stopper Only, 55/50. Replacement part for CG451610 vacuum trap.
Chemglass Life Sciences Midget Impinger, Graduated, Stopper only, 12/5 tip
Stopper only, 12/5 tip. For use with the CG182001 and CG182002 midget impinger.
Chemglass Life Sciences Foam Plug, fits 35-45mm Openings
Foam Plug, fits 35-45mm 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.
West Pharmaceutical Services Inc WEST PHARMACEUTICAL SERVICES INC
NC4014728 13MM SERUM BARRIER STOPPERS
Chemglass Life Sciences Foam Plug, fits 14-20mm Openings, Assorted Colors (Blue, White and Charcoal Grey)
Foam Plug, fits 14-20mm Openings, Assorted Colors. 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. All plugs are approximately 1.75" long, except CGE-1490-066, which is approximately 3.5" long. The Assorted Color Variety Pack includes four plugs each of charcoal grey, blue, and white.
Chemglass Life Sciences Midget Impinger, Plain Top, Fritted Tube, Graduated, Stopper Only
Stopper Only. Replacement stopper for the CG182101 midget impinger.
Chemglass Life Sciences Foam Plug, fits 46-65mm Openings, 3.5" Long
Foam Plug, fits 46-65mm Openings, 3.5" Long. 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.
Chemglass Life Sciences Trap Stopper Only, 57mm Flat O-ring Flange, Aifree, Schlenk
Trap Stopper Only, 57mm Flat O-ring Flange, Aifree, Schlenk. Trap stopper portion only. Replacement part for item AF-0300-04.
Hach Company Neoprene Stopper, with hole, #1, for Floc Jar 4117000
Stopper, neoprene, w/hole, #1. Replacement stopper for 41170-00 Wagner Floc Jar.
Chemglass Life Sciences Adapter, #9 O-Ring to 9mm Tubulation, Airfree, Schlenk
Replacement parts for AF-0451-01. #9 o-ring joint to 3/8" tubulation for Cajon adapters.
Accuflow Systems Saint-Gobain Chemware Versilic Stoppers, Silicone, 0.709x0.946x1.182 in., 10/Pk.
Saint-Gobain Chemware Versilic Stoppers are silicone stoppers suitable for a range of laboratory uses, providing a reliable seal for vessels. This particular pack includes 10 stoppers with specific dimensions to fit various apparatus.
- Made from durable silicone material
- Dimensions of 0.709 x 0.946 x 1.182 in.
- Conveniently packaged as 10 per pack
BioSpec Products SILICONE RUBBER CAP, 100/PK
These silicone rubber caps were specifically designed for use with our 2 ml stainless steel microvials. Use when beadbeating or grinding with steel beads