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
Ace Glass, Inc. Trap, stopper, vacuum, 40/50, 19mm inner & side tube OD
Trap, stopper, vacuum, 40/50, 19mm inner & side tube OD
Ace Glass, Inc. Trap, stopper, vacuum, bent vertical tube, 29/42, 13mm inner& side tube OD
Trap, stopper, vacuum, bent vertical tube, 29/42, 13mm inner& side tube OD
Ace Glass, Inc. Trap, stopper, vacuum, 55/50, 25mm inner & side tube OD
Trap, stopper, vacuum, 55/50, 25mm inner & side tube OD
Chemglass Life Sciences Rubber Stopper, #5, One Hole, Black
Rubber Stopper, #5, One Hole, Black. Similar to CG-3026 except with one hole. These stoppers are suitable for practically all general laboratory uses. Composition ensures resiliency and pliability over a long period and withstands laboratory conditions without hardening. The dimensions are in accordance with specifications established by the N.B.S. and are low in free sulfur (1/2%). Autoclavable at 250°F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application.
Chemglass Life Sciences Polyethylene Stopper for Dewar Flask, Fits CG-1593 & CG-1594-01, Codes -02, & -03
Polyethylene Stopper for Dewar Flask, Fits CG-1593 & CG-1594-01, Codes -02, & -03. Vented polyethylene stopper to minimize evaporation from Dewar flasks.
Ace Glass, Inc. #27 PTFE Stopper with Polypropylene Extraction
#27 standard taper PTFE stopper with polypropylene extraction nut for easy removal from outer joints.
Ace Glass, Inc. 125mL gas wash stopper only, porosity A
125mL gas wash stopper with porosity A (145-174micron) fritted disc.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #7, 41 x 33 x 25mm, 15 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.
Chemglass Life Sciences 14/20 Stopper, Solid
14/20 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 Stopper, Pennyhead, Hollow, 55/50
Stopper, Pennyhead, Hollow, 55/50. Hollow stopper with closed bottom.