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, Pennyhead, Solid, 14/20
Stopper, Pennyhead, Solid, 14/20. Solid stopper with closed bottom.
Foxx Life Sciences Borosil® Amber Solid Penny Head Glass Stopper with Interchangeable Ground Joint 55/54, 20/CS
Borosil® Amber Solid Penny Head Glass Stoppers are with Interchangeable Ground Joint and can be used with Volumetric Flask of 5645, 5647 families or for other suitable joints. Manufactured with low extractable quality grade USP Type I, 3.3 Borosilicate Glass. Available in sizes of 7/16 to 55/54. Amber blocks 300nm to 500nm. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil® Type 3.3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type I, Borosilicate glass that North American scientists have come to trust, Borosil® Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil® Glassware is stress-free and incredibly resistant to thermal shock.
Hampton Research NATRIX 2 NO27 185ML
HR2-917-27/Natrix 2 #27 (G03), 185 ml - 0.02 M Magnesium chloride hexahydrate, 0.05 M Sodium cacodylate trihydrate pH 7.0, 15% v/v 2-Propanol, 0.001 M Hexammine cobalt(III) chloride, 0.001 M Spermine. Please note items from this supplier are non-returnable.
Cole-Parmer Solid Black Rubber Stoppers, Standard Size 16; 1/Pk
Black rubber stoppers stay pliant over a long period and withstand laboratory conditions without hardening. Stoppers retain resiliency even after repeated autoclaving. Each stopper has its size in raised figures on top. Contain some sulfur. Autoclavable.
MSC E.R. Wagner Caster, 4 inch, TPR, Threaded Stem, 165 lb Capacity
This versatile caster is engineered for reliable mobility in industrial and commercial environments. It features a 4 inch diameter TPR wheel, a threaded stem, and offers a load capacity of 165 lb. Its robust design ensures smooth operation and durability.
- Features a 4 inch wheel diameter for easy maneuverability
- Constructed with TPR (thermoplastic rubber) wheel material for durability and floor protection
- Provides a 165 lb load capacity to support various equipment
- Equipped with a threaded stem for secure mounting
- Includes a Delrin bearing for smooth swiveling action
- Hardened-heat treated construction ensures longevity
- Finished with zinc chromate for enhanced corrosion resistance
- Suitable for a wide range of industrial and commercial applications
Research Products International Corp Laboratory Grade Rubber Stopper, BLK SBR Rubber, Size #11, 56 x 48 x 25mm, 6 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.
Grainger Stopper Sz 14 75 mm BDia Black 0
The 16WC45 is a 16-inch diameter, 45-degree elbow made of carbon steel. It has a schedule 40 wall thickness and is rated for 150 psi working pressure at 100 degrees Fahrenheit. The elbow has beveled ends and is made in the USA. It conforms to ASTM A234 standards for carbon steel pipe fittings. The elbow is typically used in steam, water, air and other low pressure applications. It provides a cost-effective way to make 45 degree turns in piping systems.
Ace Glass, Inc. #6 stopper accepted by 7478 reaction bottles.
#6 stopper accepted by 7478 reaction bottles.
Bellco Glass, Inc. Rubber STOPPER,#00
A laboratory rubber stopper is mainly used in chemical laboratory in combination with flasks and test tub. Made from rubber Closure of flask