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
GSC Go Science Crazy Rubber Stopper, Size 1, Solid (no-hole)
Science Education
A science education product.
A science education product.
Pliable Soft Rubber Stoppers for multiple applications
United Scientific™ Rubber Stoppers, One Hole
Supplier Diversity Partner
Small and/or diverse supplier based on Federal laws and SBA requirements.
Learn More
Science Education
A science education product.
Small and/or diverse supplier based on Federal laws and SBA requirements.
Learn More
A science education product.
Ideal for use with non-aggressive or concentrated solutions. Rubber Stoppers withstand temperatures from -13°F to +158°F (-25°C to +70°C).
Shape | Tapered |
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Product Type | Stopper (1 hole) |
Color | Black |
Temperature Range (Metric) | -25°C to +70°C |
Autoclavable | Autoclavable |
Sterility | Non-sterile |
Eisco™ Rubber Cones
Science Education
A science education product.
A science education product.
Designed for use with Buchner Funnels in filtration assemblies, these cones are made of flexible, quality neoprene rubber. Rubber Cones have superior chemical stability, and can withstand a wide temperature range.
Color | Blue |
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United Scientific Supplies Rubber Stopper Assortment
Supplier Diversity Partner
Small and/or diverse supplier based on Federal laws and SBA requirements.
Learn More
Science Education
A science education product.
Small and/or diverse supplier based on Federal laws and SBA requirements.
Learn More
A science education product.
This Rubber Stopper Assortment includes assorted styles, size numbers 1 to 6.
Eisco™ Solid ASTM Neoprene Stoppers
Science Education
A science education product.
A science education product.
Pack of ten solid ASTM neoprene stoppers. Made from long lasting neoprene rubber. Oil resistant, use up to 250°F / 120°C. Suitable for use with petroleum products, minerals, oils, fats as well as most inorganic acids.
Disposable | No |
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Shape | Conical |
Color | Blue |
Material | Neoprene |
Certifications/Compliance | ASTM |
For Use With (Application) | Stopper for Labware |
Sterility | Non-sterile |
Eisco™ Solid Glass Penny Head Stoppers
Science Education
A science education product.
A science education product.
Solid glass penny head stoppers are made from high quality borosilicate glass and come in a variety of joint sizes.
Color | Clear |
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Quantity | 1 |
Material | Borosilicate Glass |
For Use With (Application) | Labware closure |
Autoclavable | Yes |
GSC Go Science Crazy Rubber Stopper, Size 8, 1 hole 5mm in diameter
Science Education
A science education product.
A science education product.
Pliable Soft Rubber Stoppers for multiple applications
GSC Go Science Crazy Rubber Stopper, Size 6, 1 hole 5mm in diameter
Science Education
A science education product.
A science education product.
Pliable Soft Rubber Stoppers for multiple applications
Fisherbrand™ Disposable Polyethylene Cuvette Stoppers
Science Education
A science education product.
A science education product.
Flexible fins on cap allow for tight fit that will not damage the cuvette.
GSC Go Science Crazy Rubber Stopper, Size 6, Solid (no-hole)
Science Education
A science education product.
A science education product.
Pliable Soft Rubber Stoppers for multiple applications
GSC Go Science Crazy Rubber Stopper, Size 5, 1 hole 5mm in diameter
Science Education
A science education product.
A science education product.
Pliable Soft Rubber Stoppers for multiple applications
GSC Go Science Crazy Rubber Stopper, Size 5, Solid (no-hole)
Science Education
A science education product.
A science education product.
Pliable Soft Rubber Stoppers for multiple applications
GSC Go Science Crazy Rubber Stopper, Size 00, Solid (no-hole)
Science Education
A science education product.
A science education product.
Pliable Soft Rubber Stoppers for multiple applications
GSC Go Science Crazy Rubber Stopper, Size 0, Solid (no-hole)
Science Education
A science education product.
A science education product.
Pliable Soft Rubber Stoppers for multiple applications
GSC Go Science Crazy Rubber Stopper, Size 4, Solid (no-hole)
Science Education
A science education product.
A science education product.
Pliable Soft Rubber Stoppers for multiple applications