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 |
Color | Red |
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Material | Natural Rubber |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |
Fisherbrand™ Solid Rubber Stoppers
Offers higher resilience, flexibility and can withstand many chemical agents in normal laboratory use.
Color | Red |
---|---|
Material | Rubber |
For Use With (Application) | Laboratory use |
Fisherbrand™ Polyurethane Foam Stoppers
Formed by polymerization in the presence of a foaming agent.
Product Type | Plug Stopper |
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Quantity | 100/Pk. |
Material | Polyurethane |
Color | Red |
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Material | Natural Rubber |
Hardness | 46/55 IRHD |
For Use With (Application) | For laboratory use |
Fisherbrand™ BS 2775 Series Rubber Stopper With One Hole
Prevents liquid chemical leaks or escape from container.
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 |
Cole-Parmer™ Solid Color-Coded Silicone Stoppers
Use these silicone stoppers with a wide range of tubes and glassware. Solid Color-Coded Silicone Stoppers are available in 14 color-coded sizes and feature flexible construction for an easy fit.
Product Type | Solid Stopper |
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Material | Silicone |
Temperature Range (Metric) | –60 to 200°C |
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 |
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Color | White |
Quantity | 100/Pk. |
Material | Polyurethane |
For Use With (Application) | Microbiology |
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 |
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 |
---|---|
Material | Silicone |
Color | Red |
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Material | Rubber |
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™ LDPE Grip Stoppers
Manufactured from Low-density polyethylene (LDPE) BRAND™ LDPE Grip Stoppers are used with sample and sedimentation tubes. The dual-ringed stopper prevents sample leakage. Ridged edge provides easy gripping and handling.
Product Type | Grip Stopper |
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Quantity | 1000/Ea. |
Material | LDPE |
For Use With (Application) | Sample and sedimentation tubes |