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
DWK Life Sciences Wheaton™ Straight Plug Style Bromobutyl rubber Stoppers for Vials and Serum Bottles
For maximum sealing of vials with straight wall glass finish
Heidolph™ Distiller Equipment Caps: B24/29 Rodaviss Connect Cap
Caps for use with Heidolph distillers
DWK Life Sciences Wheaton™ Straight Plug Style Silicone Stoppers for Vials and Serum Bottles
For maximum sealing of vials with straight wall glass finish
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.
MilliporeSigma™ Supelco™ Silicone Stoppers
Stopper Diameter: 20 mm
DWK Life Sciences Kimble™ Straight-Sided Serum Stoppers
For research and pharmaceutical packaging applications
DWK Life Sciences Wheaton™ Snap-on Style Stoppers for Vials and Serum Bottles
For maximum sealing of vials with blow-back glass finish
DWK Life Sciences 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.
DWK Life Sciences Kimble™ Kontes™ Replacement Glass Stopper for Cylindrical Addition Funnels with Pressure Equalizing Lines
With pressure equalizing lines
MilliporeSigma™ Supelco™ Rubber Stoppers
Size: 20 mm
DWK Life Sciences Wheaton™ Stoppers for Serum Bottles and Vials: Locking Flange Septa
Provide airtight covers
DWK Life Sciences™ Wheaton™ Thin Flange Stopper for Serum Bottles and Vials
Provide airtight covers for your serum bottles and vials with this thin flange stopper.
DWK Life Sciences Wheaton™ BOD Bottles Replacement Robotic Stopper
Compatible with 60 and 300mL BOD bottles
Corning™ PYREX™ Hollow Combination Standard Taper Joint and Reagent Bottle Stoppers
Choose from variety of sizes and taper types