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, Flask Length, Flathead, Solid, Size 16
Stopper, Flask Length, Flathead, Solid, Size 16. Flathead design allows stopper to be inverted and placed on end thereby preventing contamination of the ground surface.
Chemglass Life Sciences Stopper, Cap Style, 24/40
Stopper, Cap Style, 24/40. Cap style stopper for use with inner joints.
Chemglass Life Sciences Stopper #13, Pennyhead, Flask Length, Solid
Stopper #13, Pennyhead, Flask Length, Solid. All sizes are solid with the exception of the #38 (CG-3018-08) which is hollow.
Chemglass Life Sciences Stopper, PTFE, Hollow, 24/40
Stopper, PTFE, Hollow, 24/40. Hollow PTFE stopper.
Chemglass Life Sciences Stopper, Cap Style, 14/20
Stopper, Cap Style, 14/20. Cap style stopper for use with inner joints.
Chemglass Life Sciences Stopper #9, Pennyhead, Flask Length, Solid
Stopper #9, Pennyhead, Flask Length, Solid. All sizes are solid with the exception of the #38 (CG-3018-08) which is hollow.
Chemglass Life Sciences Stopper, Pennyhead, Hollow, 24/40
Stopper, Pennyhead, Hollow, 24/40. Hollow stopper with closed bottom.
Research Products International Corp Laboratory Grade Rubber Stoppers w/Hole, BLK SBR Rubber, Size #10 1/2, 53 x 45 x 25mm, 7 per Package
Laboratory Grade Rubber Stoppers with hole are offered in a wide range of common sizes for most laboratory applications. Available standard black SBR rubber. Material can typically withstand temperatures up to about 100°C (212°F). Rubber stoppers with hole are molded in the USA according to standard industry size specification.
Packaged in approximately one pound packages.
Grainger Stopper Sz 8 33 mm BDia Black 0 PK12
The Grainger 16ZD71 is a Westward brand 1/4-inch drive socket set. It includes 17 sockets ranging from 4mm to 14mm in both standard and deep configurations. The sockets are made from chrome vanadium steel and have a matte black phosphate finish. The set comes packaged in a molded case for storage and portability. This socket set is ideal for automotive and machinery applications that require metric sized fasteners. The lifetime warranty provides peace of mind that the sockets are a quality and durable product.
Ace Glass, Inc. Septa, red rubber, sized for 8mm OD tubing, sp/12
Septa, red rubber, sized for 8mm OD tubing, sp/12
Ace Glass, Inc. Septa, white rubber, sized for 14/20 joints, sp/12
Septa, white rubber, sized for 14/20 joints, sp/12
Ace Glass, Inc. Septa, red rubber, sized for 24/40 joints, pk/144
Septa, red rubber, sized for 24/40 joints, pk/144
Ace Glass, Inc. Septa, red rubber, sized for 24/40 joints, sp/12
Septa, red rubber, sized for 24/40 joints, sp/12