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
Fisherbrand™ Polyurethane Foam Stoppers
Formed by polymerization in the presence of a foaming agent.
Product Type | Stopper |
---|---|
Quantity | 100/Pk. |
Material | Polyurethane |
Fisherbrand™ Natural Rubber Two Hole Stoppers
Used for laboratory purposes.
Product Type | Stopper |
---|---|
Color | Red |
Diameter (Metric) Hole | 5mm |
Material | Natural Rubber |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |
Saint Gobain Life Sciences Versilic™ Folding Skirt Stoppers
Silicone biologically neutral Versilic™ Folding Skirt Stoppers.
Product Type | Silicone Stopper |
---|---|
Material | Silicone |
Cole Parmer High-Purity Silicone Stopper
High-Purity Silicone Stopper is suited to tissue culture work and food science applications
Height (Metric) | 20 mm |
---|---|
Product Type | Stopper |
Color | Translucent |
Material | Silicone |
Certifications/Compliance | FDA compliant |
Temperature Range (Metric) | -60°C to +200°C |
Autoclavable | Yes |
Sterility | Sterile |
Fisherbrand™ Fisherbrand BS 2775 Two Holed Rubber Stopper
Prevents liquid chemical leaks or escape from container.
Cole-Parmer™ Two-Hole Rubber Stopper
Use these rubber stoppers for use with nonaggressive or low concentration solutions. Cole-Parmer™ Two-Hole Rubber Stoppers provide good tightness and adhesion and withstand laboratory conditions without hardening.
Height (Metric) | 25mm |
---|---|
Product Type | Stopper |
Color | Black |
Diameter (Metric) Hole | 5mm |
Material | Rubber |
Height (Metric) | 54mm |
---|---|
Product Type | Stopper |
Color | Red |
Quantity | 1/Ea. |
Material | Natural Rubber |
Hardness | 46/55 IRHD |
Cole-Parmer™ Twistit Stoppers, Rubber
Use these versatile Rubber Twistit Stoppers as solid, one-hole, two-hole, or three-hole stoppers.
Height (Metric) | 25 mm |
---|---|
Product Type | Twist it Stopper |
Color | White |
Material | Rubber |
Autoclavable | Autoclavable |
Fisherbrand™ White Polyurethane Foam Stoppers
Used as convenient alternative method for closing sterile media flasks and vials instead of cotton plugs.
Length (Metric) | 50 mm |
---|---|
Product Type | Stopper |
Color | White |
Quantity | 100/Pk. |
Material | Polyurethane |
For Use With (Application) | Microbiology |
Total Positions | 1 |
---|---|
For Use With (Application) | For narrow aperture containers |
Hirschmann™ SILICOSEN™ Silicone Caps
Excellent permeability and secure fitting, thanks to seal lip. Ideally suitable for agitated cultures.
Length (Metric) | 28 mm |
---|---|
Color | Pink |
Quantity | 10/Pk. |
Material | Silicone |
For Use With (Application) | For The Preparation And Sterilization Of Culture Media |
Fisherbrand™ Solid Rubber Stoppers
Offers higher resilience, flexibility and can withstand many chemical agents in normal laboratory use.
Product Type | Stopper |
---|---|
Color | Red |
Material | Rubber |
For Use With (Application) | Laboratory use |
Product Type | Bungs |
---|---|
Color | Gray |
Material | Neoprene |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |
Product Type | Stopper |
---|---|
Color | Red |
Material | Natural Rubber |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |