Stoppers
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
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Filtered Search Results
Kartell™ Stopper for RIA Disposable Test Tubes
Kartell™ Stopper for RIA Disposable Test Tubes provide a leakproof seal to the test tube, which decreases risk of spilling.
Disposable | Yes |
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Product Type | Stopper |
Material | Cellulose Fiber |
Temperature Range (Metric) | 200°C |
For Use With (Application) | Beakers, Erlenmeyer flasks, tubes, and different types of bottles |
Sterility | Sterile |
Jaece Industries Identi-plug™ Plastic Foam Stoppers
For test tubes and flasks
Non-distribution item offered as a customer accommodation; additional freight charges may apply.
Learn More
Product Type | Stopper |
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Color | White |
Autoclavable | Yes |
Fisherbrand™ BS 2775 Natural Rubber Stopper With Inlet/Outlet Holes
Chemically resistant, flexible, tightly fitting natural rubber stopper with predrilled inlet/outlet holes. Fisherbrand™ BS 2775 Natural Rubber Stopper With Inlet/Outlet Holes work well for ventilated and vacuum glassware.
Fisherbrand™ BS 2775 Series Rubber Stopper With One Hole
Prevents liquid chemical leaks or escape from container.
Height (Metric) | 54mm |
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Product Type | Stopper |
Color | Red |
Quantity | 1/Ea. |
Material | Natural Rubber |
Hardness | 46/55 IRHD |
Height (Metric) | 54mm |
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Product Type | Stopper |
Color | Red |
Quantity | 1/Ea. |
Material | Natural Rubber |
Hardness | 46/55 IRHD |
Fisherbrand™ Fisherbrand BS 2775 Two Holed Rubber Stopper
Prevents liquid chemical leaks or escape from container.
Saint Gobain Life Sciences Versilic™ Silicone Caps
Use these stoppers for biology, microbiology and hematology, as well as food science, technical, medical and hospital apparatus. Versilic™ Silicone Caps are particularly suited for all types of tissue culture work.
Product Type | Silicone Stopper |
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Quantity | 500 Pk. |
Material | Silicone |
Temperature Range (Metric) | -70 to +250°C |
Autoclavable | Autoclavable |
Saint Gobain Life Sciences Rubber Folding Skirted Stopper
Use these stoppers for a variety of applications. Saint Gobain Life Sciences&trade Rubber Folding Skirted Stopper are particularly suited for chemical transfer.
Saint Gobain Life Sciences Silicon Folding Skirt Stopper
Use this stopper for biology, microbiology and hematology, as well as food science, technical, medical and hospital apparatus. Silicon Folding Skirt Stopper is particularly suited for all types of tissue culture work.
Product Type | Silicone Stopper |
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Color | Transparent |
Quantity | 1 Ea. |
Material | Silicone |
Height (Metric) | 40mm |
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Product Type | Silicone Versilic™ Cap |
Quantity | 2/Pk. |
Material | Silicone |
Certifications/Compliance | FDA compliant food contact / BFR |
Temperature Range (Metric) | –60 to 200°C |
Autoclavable | Yes |
Material | Silicone |
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