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
Cole-Parmer Essentials Two-Hole Black Rubber Stoppers, Standard Size 1; 63/Pk
These two-hole black stoppers made with solid natural rubber stay pliable over a long period of time. Provide good tightness and adhesion, withstand laboratory conditions without hardening, and are ideal for use with nonaggressive or low concentration solutions. Each stopper has its size marked in raised figures. Low sulfur content. Withstand temperatures from 13 to 158F (25 to 70C).
Ace Glass, Inc. 34/45 Bent Vertical Hose Barb Vacuum Trap Stopper
34/45 Bent Vertical Hose Barb Vacuum Trap Stopper
Ace Glass, Inc. Septa, red rubber, sized for 8mm OD tubing, sp/12
Septa, red rubber, sized for 8mm OD tubing, sp/12
Grainger Rubber Rim Hole Plug 5/8 Rim
The Haltec Rubber Rim Hole Plug is a rubber plug designed to seal holes in wheel rims. It has a tapered design to fit different hole sizes and is made of durable rubber that resists cracking, weathering, and aging. The plugs come in a pack of 100 and fit hole sizes ranging from 5/16 inch to 3/4 inch. They can seal spoke holes, valve stem holes, and other rim holes to prevent air leaks. The plugs are easy to install by simply tapping into the hole with a hammer. Overall, the Haltec Rubber Rim Hole Plugs provide an effective and affordable way to seal holes in wheel rims.
Cole-Parmer Solid Color-Coded Silicone Stoppers, Standard Size 6.5, Yellow; 10/Bag
Stoppers Silicone Sz 6.5 10/bg
Cole-Parmer High-purity silicone stopper, size 9 (45D)
Translucent silicone stoppers are especially suited for procedures demanding high purity, such as tissue culture work and food science applications. Food-grade quality stoppers are nontoxic, chemically inert, and resist particle buildup. Withstand repeated sterilization, as well as temperatures from –76 to 392°F (–60 to 200°C). Peak at 428°F (220°C). European size (DIN no.) is noted on stopper. FDA compliant. Autoclavable.
Cole-Parmer Solid Black Rubber Stoppers, Standard Size 2; 52/Pk
Black rubber stoppers stay pliant over a long period and withstand laboratory conditions without hardening. Stoppers retain resiliency even after repeated autoclaving. Each stopper has its size in raised figures on top. Contain some sulfur. Autoclavable.
Ace Glass, Inc. Septa, precision seal, red rubber, sized for 14/20 joint, pk/100
Septa, precision seal, red rubber, sized for 14/20 joint, pk/100
Chemglass Life Sciences Stopper Only, 500mL Gas Washing Bottle, Coarse Frit
Stopper Only, 500mL Gas Washing Bottle, Coarse Frit. Replacement stopper for CG-1114-15.
Foxx Life Sciences Borosil® Amber Solid Penny Head Glass Stopper with Interchangeable Ground Joint 7/16, 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 confirming to ASTM E438 Class A requirements. 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.
Foxx Life Sciences Borosil® Solid Penny Head Glass Stopper with Interchangeable Ground Joint 14/23, 20/CS
Borosil® 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 confirming to ASTM E438 Class A requirements. Available in sizes of 7/16 to 55/54. 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.