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
Corning™ PYREX™ Standard Taper Polyethylene Stoppers
Design protects neck during event of accidental tipping
DWK Life Sciences Kimble™ Kontes™ Solid Pennyhead Glass Full Length Stoppers
Stoppers are used with laboratory glassware such as flasks and separatory funnels.
Cytiva Whatman™ Stopper for use with MV050 Vacuum Filtration Manifolds
Replacement Rubber Stopper for use with MV050 Vacuum Filtration Manifolds.
Corning™ PYREX™ Hollow Combination Standard Taper Joint and Reagent Bottle Stoppers
Choose from variety of sizes and taper types
MilliporeSigma™ Supelco™ Rubber Stoppers
Generally used to seal samples in vials
DWK Life Sciences Wheaton™ Straight Plug Rubber Stoppers
Provides maximum sealing for vials with straight-wall glass finishes. Wheaton™ Straight Plug Rubber Stoppers are manufactured from the highest quality raw materials.
DWK Life Sciences Kimble™ Kontes™ Full Length Pennyhead Stoppers, 10/30
Stoppers are used with laboratory glassware such as flasks, mixing cylinders and separatory funnels.
DWK Life Sciences Wheaton™ BOD Bottles Replacement Robotic Stopper
Compatible with 60 and 300mL BOD bottles
DWK Life Sciences Wheaton™ Lyophilized Stopper: Igloo Lyophilization Stopper
Very low adsorption of the preservatives present in aqueous parenteral solutions - Available in 2-Leg, 3-Leg and Igloo styles.
DWK Life Sciences Wheaton™ Stoppers for Serum Bottles and Vials: Locking Flange Septa
Provide airtight covers
DWK Life Sciences Wheaton™ Lyophilized Stopper: 2-Leg Lyophilization Stopper
Very low adsorption of the preservatives present in aqueous parenteral solutions - Available in 2-Leg, 3-Leg and Igloo styles.
DWK Life Sciences Kimble™ Stoppers for Headspace Vials
Gray stoppers for aluminum seal finish
MilliporeSigma™ Supelco™ Rubber Stoppers
Size: 20 mm
DWK Life Sciences Kimble™ Straight-Sided Serum Stoppers
For research and pharmaceutical packaging applications