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 Stopper, Spherical, Cap Type, Size 28/15
Stopper, Spherical, Cap Type, Size 28/15. Cap style stopper to be used with apparatus having a spherical ball joint. For clamp see CG-150.
Chemglass Life Sciences #27 PTFE Stopper, Red Handle, Hollow
#27 PTFE Stopper, Red Handle, Hollow. Flask length PTFE stopper with color coded handle.
MARIAN MEDICAL INC ACE Stopper, 14Fr/100mm, W/ ACElok Dressing, 1 Each
ACE Stopper. Stoma Accessory. Marian Medical Inc. AP Series. Silicone ACE stopper for stoma closure and tract maintenance. Includes ACElok external fixation dressing. Available in multiple French sizes and lengths. For use in ACE and Malone stoma management. Packaged as 1 each.
Chemglass Life Sciences 19/22 Stopper, Solid
19/22 Stopper, Solid. PTFE stopper has a Polypropylene extraction nut permitting easy removal of the stopper from the glass outer joint. The 14/20 and 19/22 are solid, while the larger sizes are hollow.
Chemglass Life Sciences #16 PTFE Stopper, Blue Handle
#16 PTFE Stopper, Blue Handle. Flask length PTFE stopper with color coded handle.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #00, 15 x 10 x 25mm, 106 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 Stopper, Rubber, One Hole, Size 8, 1/pk
#8 Black SBR stopper, complete with one 7/8 inch diameter drilled center hole. 1/pk.
Grainger Stopper Sz 2 16 mm BDia Black 0 PK25
The Grainger Approved 2-1H Stopper Sz 2, 16 mm BDia, Black 0 PK25 is a rubber stopper made of black butyl rubber. It has an outer diameter of 16 mm, an inner diameter of 6 mm, and a length of 16 mm. This stopper is designed to provide a tight seal and fit snugly into containers. It comes in a pack of 25 stoppers. The stoppers are rated to withstand temperatures between -65 to 250°F. This product can be used to plug bottles, vials, tubes and other containers in laboratory, industrial, and chemical processing applications. The black color provides contrast for easy visual inspection.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #12, 64 x 54 x 25mm, 5 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.
