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 Rubber Stopper, #5-1/2, One Hole, Black
Rubber Stopper, #5-1/2, One Hole, Black. 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 250F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (28mm), Bottom (24mm). Length: (25mm). Diameter of hole: (5mm).
Med Vet International Compression Plate 4.5mm, 6-hole, 103mm L, J0427E
Use with 4.5mm cortical screws to produce fracture-site compression.
Grainger 3 Hole - Center Tap Base Plate Double
The Tripp Lite 16U351 is a 19-inch open frame rack enclosure cabinet with a depth of 35 inches. It has an adjustable mounting depth from 22 to 35 inches and comes with mounting rails, leveling feet and a vented top panel. The steel enclosure has a weight capacity of 1000 lbs and is compatible with EIA-310-D mounting rails. The cabinet comes unassembled in a flat pack box to reduce shipping costs. Overall, the 16U351 provides an open and adaptable rack enclosure solution for mounting up to 16U of 19-inch rackmount equipment.
Chemglass Life Sciences Rubber Stopper, #9-1/2, One Hole, Black
Rubber Stopper, #9-1/2, One Hole, Black. 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 250F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (46mm), Bottom (38mm). Length: (25mm). Diameter of hole: (5mm).
Hach Company Stopper, Neoprene, Solid, Size 6, 6/pk
Recommended where natural rubber would deteriorate or be attacked.
Chemglass Life Sciences Solid Rubber Stopper, #10-1/2, Black
Solid Rubber Stopper, #10-1/2, Black. 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 250F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (53mm), Bottom (45mm). Length: (25mm).
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #6, 32 x 26 x 25mm, 18 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 accordinig to standard industry size specification. Packaged in approxinmately one pound packages.
Ace Glass, Inc. Stopper, cone, 37mm OD top, 22mm OD bottom, black neoprene, pk12
22mm to 37mm OD black neoprene nested ring pluro stoppers. Will give a vacuum tight fit for all openings within its size range. Suitable for applications from -40 to 150 degrees F.
Research Products International Corp Laboratory Grade Rubber Stoppers, Green Neoprene Rubber, Size #13, 4 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.
Grainger Stopper Sz 11 48 mm BDia Black 0 PK7
The Grainger 16VC08 is a 16-ounce aerosol can of CRC Brakleen non-chlorinated brake parts cleaner. It is a fast drying, non-flammable cleaner that removes oil, grease, brake fluid, and other contaminants from brake linings and drums. It contains no 1,1,1 trichloroethane, chlorofluorocarbons, or any ozone depleting substances. This brake parts cleaner features a 360-degree valve for convenient application at any angle.
Chemglass Life Sciences Rubber Stopper, #2, Two Holes, Black
Rubber Stopper, #2, Two Holes, Black. Similar to CG-3026 and CG-3027 except with two holes. 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 250F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (20mm), Bottom (16mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Rubber Stopper, #13-1/2, One Hole, Black
Rubber Stopper, #13-1/2, One Hole, Black. 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 250F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application. Diameter: Top (75mm), Bottom (62mm). Length: (35mm). Diameter of hole: (5mm).