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
Product Type | Turnover Septum Stopper |
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Total Positions | 1 |
For Use With (Application) | For narrow aperture containers |
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 |
Color | Gray |
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Material | Neoprene |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |
Color | Red |
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Material | Natural Rubber |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |
Lenz Laborglasinstrumente™ Pointed Bottom Hollow Stoppers, Hexagonal Plate
For the safe and secure closure of flasks, bottles, tubing and other laboratory apparatus. Lenz Laborglasinstrumente™ Pointed Bottom Hollow Stoppers, Hexagonal Plate are manufactured from durable DURAN™ borosilicate glass.
Description | Hollow |
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Product Type | Hollow Stopper |
Quantity | 10/Pk. |
Material | Borosilicate Glass |
BRAND™ BISTABIL™ Borosilicate Glass Conical Ground Joint Stopper, Hexagonal Grip
Hollow with drip tip and hexagonal grip. BRAND™ BISTABIL™ Borosilicate Glass Conical Ground Joint Stopper is constructed from Boro 3.3 to DIN 12252 standards.
Shape | Conical |
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Product Type | Ground Joint Stopper |
Quantity | 1/Pk. |
Material | Borosilicate Glass |
DWK Life Sciences Wheaton™ Ultra Pure Straight Plug Stoppers
Provides for extremely high chemical purity and low gas permeability. Wheaton™ Ultra Pure Straight Plug Stoppers are manufactured from an ultra pure bromobutyl formulation.
Product Type | Straight Plug Stopper |
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Color | Gray |
Material | Bromobutyl Rubber |
Autoclavable | Autoclavable |
Deutsch Neumann™ Silicone Rubber Stoppers
For safe and secure closure of laboratory apparatus. Deutsch Neumann™ Silicone Rubber Stoppers are translucent in color.
Color | Transparent |
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Material | Silicone |
Saint Gobain Life Sciences Versilic™ Silicone Stoppers
Versilic™ Stoppers for biology, microbiology and hematology.
Product Type | Silicone Stopper |
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Material | Silicone |
Temperature Range (Metric) | -70°C and +250°C |
Fisherbrand™ PTFE Flat Head Stopper
Contains B Length Cone for Europe. Fisherbrand™ PTFE Flat Head Stopper can be used up to 280°C.
Description | Push Fit |
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For Use With (Equipment) | Ground Glass Joints |
Product Type | Tapered Stopper |
Color | White |
Quantity | 1/Ea. |
Material | PTFE |
Certifications/Compliance | Certificate of Conformance, Certificate of Analysis, Product Data Sheet, Material Safety Data Sheet (MSDS) |
Temperature Range (Metric) | -200 to +280°C |
Autoclavable | Autoclavable |
Disposable | Single-use |
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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 |
Kartell™ PTFE Tapered Stoppers
Quality PTFE constructed stopper to work in a variety of application. Kartell™ PTFE Tapered Stoppers can withstand high temperatures as well as a wide range of chemicals.
Product Type | Tapered Stopper |
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Quantity | 1/Pk. |
Material | PTFE |
Certifications/Compliance | DIN Standards 12242 |
For Use With (Application) | Suitable for foodstuff |
Autoclavable | Autoclavable |
Product Type | Solid Stopper |
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Color | Gray |
Material | Neoprene |
Cowie Technology™ PTFE Flat Head Stopper
Cowie Technology™ PTFE Flat Head Stopper features trapezoidal rings that give high vacuum performance and reduce seizure.