Stoppers

Stoppers

Stoppers, also known as bungs, are used to give an airtight seal to laboratory flasks and test tubes by fitting tightly inside a container's neck, preventing material from spilling out. Rubber stoppers are often sized with a stopper number or stopper size, using the stopper's top and bottom diameter dimensions. Sizing can vary among manufacturers. Stoppers are typically designed with a conical shape, but straight and flanged options are also available. Rubber stoppers are available in a solid design or with holes, also known as positions, present on the stopper's top. Positions are used to

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Solid Rubber Stoppers 
Offers higher resilience, flexibility and can withstand many chemical agents in normal laboratory use.
Solid Natural Rubber Stoppers 
Used for laboratory purposes.
Silicone Stoppers 
For laboratory and/or food testing, industrial masking or educational use.
Sleeve Type Septum 
The Sleeve Type Septum is a flanged type stopper with a hollow plug and sleeve extension that folds down over the neck of vessel, tubing, etc. The diaphragm can be punctured with a syringe needle, resealing after need is withdrawn.
Solid Neoprene Rubber Stoppers 
Solid Rubber Stoppers 
Available in a variety of sizes ranging from 000 through 16
Identi-plug™ Plastic Foam Stoppers 
For test tubes and flasks
Solid Neoprene Rubber Stoppers 
Recommended where rubber would be attacked or deteriorated
Solid Rubber Stoppers 
Available in a variety of sizes ranging from 000 through 16
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.
Wheaton™ Ultra Pure OmniFlex Pure Stoppers 
Featuring PTFE-like coatings to prevent reactions due to sample contact with rubber. Wheaton™ Ultra Pure OmniFlex Plus Stoppers are manufactured in a silicone-free environment.
Wheaton™ Lyophilized Stopper: Straight Plug Stopper 
Very low adsorption of the preservatives present in aqueous parenteral solutions - Available in 2-Leg, 3-Leg and Igloo styles.
Turnover Septum Stoppers 
For narrow-aperture containers
Polyurethane Foam Stoppers 
Formed by polymerization in the presence of a foaming agent.
White Polyurethane Foam Stoppers 
Used as convenient alternative method for closing sterile media flasks and vials instead of cotton plugs.
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