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 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.
Chemglass Life Sciences Midget Impinger, Graduated, Stopper only, Plain tip
Stopper only, Plain tip. For use with the CG182001 and CG182002 midget impinger.
Cole-Parmer Solid Color-Coded Silicone Stoppers, Standard Size 0, Green; 50/Bag
Silicone bubbles make these stoppers lightweight—they float on water. Withstand temperatures from –76 to 392°>F (–60 to 200°>C). Stoppers are available in 14 color-coded sizes, given in both standard and Japanese size numbers. Softness and flexibility allow stoppers to fit a range of holes. Easily make openings for glassware fit your exact specifications with the optional cork borer set. 2 bg/cs.*
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 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, 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, Flask Length, PTFE, Size 13
Stopper, Flask Length, PTFE, Size 13. PTFE stopper for use in flask length outer joints.
Research Products International Corp Laboratory Grade Rubber Stoppers, Green Neoprene Rubber, Size #10 1/2, 7 per Package
Laboratory Grade Rubber Stoppers offered in a wide range of common sizes for most laboratory applications. Available in green neoprene rubber that is resistant to chemicals and ozone deterioration or standard black SBR rubber. Solid rubber stoppers are molded in the USA according to standard industry size specification. Packaged in approximately one pound packages.
West Pharmaceutical Services Inc 20mm NovaPure® Ready-to-Sterilize Bromobutyl 4023/50 Serum Stoppers, Qty. 3,000 stoppers/bag
NovaPure® serum stoppers are made from 4023/50 a premium quality bromobutyl elastomer with West’s lowest particulate specification available. Laminated with FluroTec™ barrier film to help reduce particulate, limit drug interaction with the elastomer and reduce leachables. These components are provided washed (ready-to-sterilize) and 100% vision inspected. This stopper configuration can be used with European blowback, North American blowback, or straight wall (no blowback) vials. West item number: 70025047
Grainger Stopper Sz 9 37 mm BDia Black 0 PK10
The Grainger 16ZD76 is a 3M Scotch-Brite General Purpose Hand Pad that can be used for cleaning and scouring. It features an open web construction with non-scratching fibers that are ideal for cleaning pots, pans, dishes, floors, walls, and more. This 6 inch by 9 inch hand pad has a medium duty scrubbing level. It is disposable and can stand up to water, grease, and detergents. The 3M Scotch-Brite General Purpose Hand Pad removes dirt and grime without damaging surfaces.
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, precision seal, red rubber, sized for 14/20 joint, pk/100
Septa, precision seal, red rubber, sized for 14/20 joint, pk/100