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 Kimble™ Stoppers for Headspace Vials
Gray stoppers for aluminum seal finish
DWK Life Sciences Kimble™ Two-Leg Lyophilization Serum Bottle of Vial Stoppers
For research and pharmaceutical packaging applications
DWK Life Sciences Kimble™ Kontes™ Butyl Rubber Stopper, Plug style
Designed for aluminum seal finish vials
DWK Life Sciences Kimble™ Kontes™ Solid Standard Taper Pennyhead Stoppers
Stoppers are used with laboratory glassware such as flasks, mixing cylinders and separatory funnels.
DWK Life Sciences Kimble™ Kontes™ KEM-KLAMP Solid Pennyhead Glass Stopper with Lug
These stoppers are designed for use with 675500 KEM-KLAMPS™.
DWK Life Sciences Kimble™ Kontes™ Replacement Glass Stopper for Cylindrical Addition Funnels with Pressure Equalizing Lines
With pressure equalizing lines
Heidolph™ Distiller Equipment Caps: B14/23 Rodaviss Sealing Cap
Caps for use with Heidolph distillers
Heidolph™ Distiller Equipment Caps: B24/29 Rodaviss Connect Cap
Caps for use with Heidolph distillers
Synthware™ Hollow Penny Head Stopper
Heavy wall hollow penny head stopper
Synthware™ 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.
Synthware™ Flask Length Penny-Head Stopper
Various Joint Sizes Available.
Synthware™ PFTE Stopper with Extraction Nut
Stopper has a nylon extraction nut permitting easy removal of the stopper from the glass outer joint.
Synthware™ Cap Style Stopper
For an apparatus with an inner opening.