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
Chemglass Life Sciences #38 PTFE Stopper, Black Handle, Hollow
#38 PTFE Stopper, Black Handle, Hollow. Flask length PTFE stopper with color coded handle.
SIGMA ALDRICH FINE CHEMICALS BIOSCIENCES SLEEVE STOPPER SEPTA FKM
NC3257959 SLEEVE STOPPER SEPTA FKM
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #000, 12.7 x 8.2 x 21mm, 183 per Package
Laboratory Grade Rubber Stoppers offered in a wide range of common sizes for most laboratory applications. Available standard black SBR rubber. Solid rubber stoppers are molded in the USA according to standard industry size specification. Packaged in approximately one pound packages.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #9, 45 x 37 x 25mm, 10 per Package
Laboratory Grade Rubber Stoppers offered in a wide range of common sizes for most laboratory applications. Available standard black SBR rubber. Solid rubber stoppers are molded in the USA according to standard industry size specification. Packaged in approximately one pound packages.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #5, 27 x 23 x 25mm, 28 per Package
Laboratory Grade Rubber Stoppers offered in a wide range of common sizes for most laboratory applications. Available standard black SBR rubber. Solid rubber stoppers are molded in the USA according to standard industry size specification. Packaged in approximately one pound packages.
Hach Company Replacement Stopper
Replacement stopper for use with Gas washing bottle in the Hach Cold Vapor Mercury Apparatus Set (Prod No 2674400) to perform Cold Vapor Mercury Concentration Analysis Hach Method 10065
West Pharmaceutical Services Inc STOPPERS STERILIZED 500PCS/BAG
NC3842868 STOPPERS STERILIZED 500PCS/BAG
Chemglass Life Sciences Stopper, Grey Butyl Rubber, 20mm ASF
Stopper, Grey Butyl Rubber, 20mm ASF. For use with Headspace Vials.
Perkin Elmer US LLC Un-Assembled Aluminum Crimp Cap with Butyl (Grey) Stopper, 1000/pk
We offer a variety of GC headspace vials, caps and septa to fulfil your application needs. Our patented vial and cap design incorporates pressure-relief features which guarantee safe operation with the high pressure typically developed during thermostatting. Ordinary vials and caps without these safety features may burst. All of our headspace vials have a greater wall thickness and round base which enables them to withstand pressure up to 60 psig. Low-volume sampling can be achieved by using a 6 mL vial and vial adapter. All PerkinElmer headspace vials are manufactured to specific tolerances that are guaranteed for fit and performance. Note: Due to the patent which PerkinElmer holds on the closures system of the Headspace vials, the caps, septa, and star springs cannot be sold separately. Vial Top Type Cap Type Septa Material Quantity Crimp Top Aluminum Butyl (Grey) Stopper 1000
Chemglass Life Sciences Trap Stopper Only, 57mm Flat O-ring Flange, Aifree, Schlenk
Trap Stopper Only, 57mm Flat O-ring Flange, Aifree, Schlenk. Trap stopper portion only. Replacement part for item AF-0300-04.
Ace Glass, Inc. #50 solid PTFE plug, 7855-748 FETFE O-ring back seal
#50 solid PTFE plug, 7855-748 FETFE O-ring back seal