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 Rubber Stopper, #13-1/2, Two Holes, Black
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 established by the N.B.S. and are low in free sulfur (1/2%). Autoclavable at 250¿F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application.
Fireflysci Stopper 7 for P65 Series Cuvette Washers
Stopper 7 for P65 Series Cuvette Washers- Fits with FireflySci Vacuum Flask- Part of Cuvette Washer Kit
Foxx Life Sciences Borosil® Amber Solid Penny Head Glass Stopper with Interchangeable Ground Joint 45/40, 20/CS
Borosil® Amber Solid Penny Head Glass Stoppers are with Interchangeable Ground Joint and can be used with Volumetric Flask of 5645, 5647 families or for other suitable joints. Manufactured with low extractable quality grade USP Type I, 3.3 Borosilicate Glass. Available in sizes of 7/16 to 55/54. Amber blocks 300nm to 500nm. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil® Type 3.3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type I, Borosilicate glass that North American scientists have come to trust, Borosil® Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil® Glassware is stress-free and incredibly resistant to thermal shock.
Chemglass Life Sciences Stopper, Cap Style, 24/40
Stopper, Cap Style, 24/40. Cap style stopper for use with inner joints.
Chemglass Life Sciences Stopper, PTFE, Hollow, 24/40
Stopper, PTFE, Hollow, 24/40. Hollow PTFE stopper.
Foxx Life Sciences Borosil® Plastic Polypropylene Stopper for Volumetric Flasks with Interchangeable Joint 29/32, 50/CS
Borosil® Plastic Polypropylene Flat Head Stoppers are with Interchangeable Joint and can be used with Volumetric Flask of 5645, 5647 families or for other suitable joints. Polypropylene Available in sizes of 7/16 to 34/35. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil® Type 3.3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type I, Borosilicate glass that North American scientists have come to trust, Borosil® Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil® Glassware is stress-free and incredibly resistant to thermal shock.
Foxx Life Sciences Borosil® Plastic Polypropylene Stopper for Volumetric Flasks with Interchangeable Joint 12/21, 100/CS
Borosil® Plastic Polypropylene Flat Head Stoppers are with Interchangeable Joint and can be used with Volumetric Flask of 5645, 5647 families or for other suitable joints. Polypropylene Available in sizes of 7/16 to 34/35. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil® Type 3.3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type I, Borosilicate glass that North American scientists have come to trust, Borosil® Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil® Glassware is stress-free and incredibly resistant to thermal shock.
Chemglass Life Sciences Rubber Stopper, #5, One Hole, Black
Rubber Stopper, #5, One Hole, Black. Similar to CG-3026 except with one hole. 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 established by the N.B.S. and are low in free sulfur (1/2%). Autoclavable at 250°F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application.
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.
Research Products International Corp Laboratory Grade Rubber Stoppers, Green Neoprene Rubber, Size #10 1/2, 7 per Package
Laboratory Grade Rubber Stoppers offered in a wide range of common sizes for most laboratory applications. Available in green neoprene rubber that is resistant to chemicals and ozone deterioration or standard black SBR rubber. Solid rubber stoppers are molded in the USA according to standard industry size specification. Packaged in approximately one pound packages.
Ace Glass, Inc. Stopper, cone, 46mm OD top, 29mm OD bottom, black neoprene, pk12
29mm to 46mm OD black neoprene nested ring pluro stoppers. Will give a vacuum tight fit for all openings within its size range. Suitable for applications from -40 to 150 degrees F.
Chemglass Life Sciences Stopper Only, #10 Silicone, 9/16" Hole
Silicone stopper for use with the CG142001 filtration support assembly. STOPPER ONLY.
Chemglass Life Sciences Polyethylene Stopper for Dewar Flask, Fits CG-1593 & CG-1594-01, Codes -02, & -03
Polyethylene Stopper for Dewar Flask, Fits CG-1593 & CG-1594-01, Codes -02, & -03. Vented polyethylene stopper to minimize evaporation from Dewar flasks.
Chemglass Life Sciences Nylon Loosening Nut, 45/50, 25.4mm & 30mm
Nylon Loosening Nut, 45/50, 25.4mm & 30mm. Replacement part for CG2077H series of PTFE stirrer bearings.
Chemglass Life Sciences Vacuum Trap Stopper Only, 29/42
Vacuum Trap Stopper Only, 29/42. Replacement part for CG451601 vacuum trap.