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 Silicone Plug Stoppers, 7mm
Microcarrier spinner flasks promote optimal growth of suspension and microcarrier cultures.Indented bottoms, 100mL thru 1000mL, prevent accumulation of microcarrier beads under the impeller paddle.Please Note: The 6L and 8L Versions Do Not Have Dimpled Bottoms.The complete system includes a flask with two angled sidearms and a PTFE paddle with glass shaft that adjusts trough the compression fitting in the cap.
Accuflow Systems Saint-Gobain Versilic Stopper, Silicone, 5 x 9 x 20 mm
Versilic silicone stoppers, 5 x 9 x 20 mm, provide a tight laboratory seal for tubes, flasks, and vessels. Molded from silicone, they offer broad chemical compatibility and a wide operating temperature range suitable for routine biological and biopharmaceutical workflows.
- Silicone material
- Dimensions: 5 x 9 x 20 mm (0.197 x 0.355 x 0.788 in)
- Pack quantity: 10 per pack
- Withstands temperatures from -70 °C to 250 °C (-94 °F to 482 °F)
- Suitable for biology, hematology, microbiology, and biopharmaceutical applications
- Meets FDA and BGA standards
Grainger K4796 Silicone Round Cord 1/4 D 100 L 70A Blue
The Silicone Round Cord from Grainger is a flexible, durable silicone cord that can withstand temperatures from -100 to 500°F. It has a round cross-section and comes in multiple diameters from 1/16 inch to 3/4 inch. The cord is made from platinum-cured silicone which provides excellent resistance to weathering, aging, moisture, and UV rays. With the ability to tie knots without weakening, this silicone cord has many potential uses including automotive, HVAC, marine, and more. The cord comes in standard lengths of 25 feet and 50 feet.
Grainger K4796 Silicone Round Cord 3/32 D 10 L 70A Blue
The Silicone Round Cord Metal is a silicone rubber cord with a metal core that is flexible and durable. It is made of high quality silicone rubber with a stainless steel wire core and has excellent resistance to extreme temperatures, sunlight, moisture, and chemicals. This cord comes in multiple diameters from 1/8 inch to 3/4 inch and is sold by the foot, with a minimum order of 1 foot. It can withstand temperatures ranging from -85°F to 500°F. Potential applications include automotive, HVAC, marine, and appliance uses. This product is manufactured in the USA.
Foxx Life Sciences Borosil® Solid Penny Head Glass Stopper with Interchangeable Ground Joint 19/26, 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.
Foxx Life Sciences Borosil® Solid Penny Head Glass Stopper with Interchangeable Ground Joint 45/40, 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.
Foxx Life Sciences Borosil® Solid Penny Head Glass Stopper with Interchangeable Ground Joint 7/16, 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.
Ace Glass, Inc. 125mL gas wash stopper only, porosity B
125mL gas washing stopper with porosity B (70-100 micron) 25mm fritted disc diameter, and 40/35 joint. Inlet/outlet arms are 8mm O.D.
Ace Glass, Inc. 250mL gas wash stopper only, porosity B
250mL gas washing stopper with porosity B (70-100 micron) 25mm fritted disc diameter, and 40/35 joint. Inlet/outlet arms are 8mm O.D.