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
Research Products International Corp Laboratory Grade Rubber Stoppers with Hole, BLK SBR Rubber, Size #12, 64 x 54 x 25mm, 5 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.
Chemglass Life Sciences Septum Stopper, Sleeve Type, For 24/40-24/25 Outer Joints, Red
Septum Stopper, Sleeve Type, For 24/40-24/25 Outer Joints, Red. Sleeve type stoppers with a hollow plugs and sleeve extensions that folds down over the neck of a vessel, tubing, etc. The diaphragm can be punctured with a syringe needle, re-sealing after the needle is withdrawn.
Chemglass Life Sciences Septum Stopper, Sleeve Type, For 29/26-29/42 Outer Joints, Red
Septum Stopper, Sleeve Type, For 29/26-29/42 Outer Joints, Red. Sleeve type stoppers with a hollow plugs and sleeve extensions that folds down over the neck of a vessel, tubing, etc. The diaphragm can be punctured with a syringe needle, re-sealing after the needle is withdrawn.
Chemglass Life Sciences Rubber Stopper, #8, Two Holes, Black
Rubber Stopper, #8, 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 (41mm), Bottom (33mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Rubber Stopper, #4, Two Holes, Black
Rubber Stopper, #4, 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 (26mm), Bottom (20mm). Length: (25mm). Diameter of holes: (5mm).
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.
Chemglass Life Sciences Rubber Stopper, #13, One Hole, Black
Rubber Stopper, #13, 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 (68mm), Bottom (58mm). Length: (25mm). Diameter of hole: (5mm).
Grainger Rubber Rim Hole Plug 5/8 Rim
The Haltec Rubber Rim Hole Plug is a rubber plug designed to seal holes in wheel rims. It has a tapered design to fit different hole sizes and is made of durable rubber that resists cracking, weathering, and aging. The plugs come in a pack of 100 and fit hole sizes ranging from 5/16 inch to 3/4 inch. They can seal spoke holes, valve stem holes, and other rim holes to prevent air leaks. The plugs are easy to install by simply tapping into the hole with a hammer. Overall, the Haltec Rubber Rim Hole Plugs provide an effective and affordable way to seal holes in wheel rims.
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. Pk6 50mm 10 microliter, 26 gauge, 20° bevel removable needle syringe.
Pk6 50mm 10 microliter, 26 gauge, 20° bevel removable needle syringe.
Bellco Glass, Inc. Polypropylene Volumetric Flask W/Polypropylene Stopper,500mL Class B
Individually calibrated to deliver at 20C. Durable ring marks resilient wear. Supplied with standard ground polypropylene stopper. Certified Class B tolerance per DIN ISO 1042. Translucent with individual ring mark. Volume: 500ml Accuracy +/- ml: 0.40 Height: 270mm Stopper size: 19/26
Chemglass Life Sciences Solid Rubber Stopper, #7, Black
Solid Rubber Stopper, #7, 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 (37mm), Bottom (30mm). Length: (25mm).
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #4, 26 x 20 x 25mm, 33 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.