Stoppers
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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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Product Type | Turnover Septum Stopper |
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Total Positions | 1 |
For Use With (Application) | For narrow aperture containers |
Color | Gray |
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Material | Neoprene |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |
Fisherbrand™ Silicone Stoppers
For laboratory and/or food testing, industrial masking or educational use.
Product Type | Stopper |
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Material | Silicone |
Color | Red |
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Material | Natural Rubber |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |
Fisherbrand™ White Polyurethane Foam Stoppers
Used as convenient alternative method for closing sterile media flasks and vials instead of cotton plugs.
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Length (Metric) | 50 mm |
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Color | White |
Quantity | 100/Pk. |
Material | Polyurethane |
For Use With (Application) | Microbiology |
Fisherbrand™ Solid Rubber Stoppers
Offers higher resilience, flexibility and can withstand many chemical agents in normal laboratory use.
Color | Red |
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Material | Rubber |
For Use With (Application) | Laboratory use |
Kartell™ Rubber One-Hole Stoppers
Manufactured from rubber to ensure a tight fit. Kartell™ Rubber One-Hole Stoppers seal and secure medium in a bottle while providing tubing access.
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Color | Red |
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Material | Rubber |
Deutsch Neumann™ Grey Natural Rubber Stoppers
For safe and secure closure of laboratory apparatus. Deutsch Neumann™ Grey Natural Rubber Stoppers are suitable for general use.
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Color | Gray |
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Quantity | 1/Ea. |
Material | Natural Rubber |
Saint Gobain Life Sciences Versilic™ Folding Skirt Stoppers
Silicone biologically neutral Versilic™ Folding Skirt Stoppers.
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Product Type | Silicone Stopper |
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Material | Silicone |
Product Type | Tapered Stopper (2 holes) |
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Color | Red |
Diameter (Metric) Hole | 5 mm |
Material | Natural Rubber |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |
Deutsch Neumann™ Silicone Rubber Stoppers
For safe and secure closure of laboratory apparatus. Deutsch Neumann™ Silicone Rubber Stoppers are translucent in color.
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Material | Silicone |
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Product Type | Silicone Stopper |
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Color | Translucent |
Material | Silicone |
DWK Life Sciences Kimble™ Kontes™ Hollow White Rubber Sleeve Stoppers
Hollow stopper fits into the neck of the glassware apparatus. Series 774261 may be used at up to 125°C for up to 8 hours.
For Use With (Equipment) | NMR tubes, pressure venting or adding reactants via syringe |
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Product Type | Plug-type Sleeve Stopper |
Color | White |
Material | Rubber |
Kartell™ Stopper, conical, red rubber, upper\lower diameters 37 x 28mm, height 37mm
Kartell™ Red Rubber Conical Stoppers are suitable for high temperatures and are used in combination with a flask, bottle, or tube.
Color | Red |
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Material | Natural Rubber |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |