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 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).
Grainger Stopper Sz 15 83 mm BDia Black 0
The 16WC60 is a 60-watt, 120-volt A19 medium base LED light bulb made by GE Lighting. This bulb produces 800 lumens of soft white light at a color temperature of 2700K. It has an estimated yearly energy cost of $7 and an average life of 15,000 hours. This bulb can be used in enclosed fixtures and is dimmable. It measures 4.25 inches in length and 2.375 inches in diameter. The 16WC60 provides an energy-efficient LED alternative to traditional incandescent bulbs.
Grainger Stopper Sz 0 9 mm BDia Black 0 PK100
The Grainger 16UC46 is a 16-ounce can of CRC Brakleen Brake Parts Cleaner. It is a fast drying, non-flammable brake parts cleaner that removes oil, grease, brake fluid, and other contaminants from brake linings and drums. This product can be used on brakes, clutches, and other metal parts. It comes in a 16-ounce aerosol can and is made in the USA. The can measures 4-1/2 inches tall by 2-1/2 inches in diameter.
Enterprise Technology Solutions Rubber Numberer
Rubber Numberer Conventional Type Size 2 Eight Bands
Sigma Aldrich Fine Chemicals Biosciences Precision SealR rubber sep
Engineered for a push on fit in NMR tubes and ampules. The unique design provides a penetration point for cannulation and a dual seal inside the tube and on the outer sleeve. Will not break delicate thin-wall tubing. Manufactured from one certified raw material formulation for absolute consistency in all sizes from lot to lot.Storage Note for Natural Rubber Septa Store septa in a closed bag out of sunlight to retard blooming which is the formation of a whitish film on the surface of the rubber. Blooming is a natural process and does not affect performance. Remove visible bloom by washing or wiping off before use.
Research Products International Corp Laboratory Grade Rubber Stoppers, Green Neoprene Rubber, Size #2, 48 per Pack
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.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #5 1/2, 32 x 26 x 25mm, 25 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.
Chemglass Life Sciences Solid Rubber Stopper, #9, Black
Solid Rubber Stopper, #9, 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 (45mm), Bottom (37mm). Length: (25mm).
Chemglass Life Sciences Septum Stopper, Suba-Seal, For 14/20-14/35 Outer Joints and 12.5mm ID Tubing
Septum Stopper, Suba-Seal, For 14/20-14/35 Outer Joints and 12.5mm ID Tubing. Suba-Seal septa are a flanged stopper with a hollow plug and sleeve extension that folds down over the neck of the vessel. In addition to the pull over sleeve, Suba-Seal stoppers have a series of annular serrations on the plug portion of the septa. Each of these serrations depress along the inner wall of the glass vessel to form an extremely effective air-tight seal. Stoppers are made from natural red rubber and sold in the package quantities listed below.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #10 1/2, 53 x 45 x 25mm, 7 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.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #11 1/2, 63 x 50 x 25mm, 5 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.
Chemglass Life Sciences Rubber Stopper, #5, One Hole, Black
Rubber Stopper, #5, One Hole, Black. Similar to CG-3026 except with one hole. 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 250°F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application.
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.
Quality Lab Accessories SET SCREW STYLE CANNULA STOPPR
Adjustable Cannula Stopper with set screw for Sotax (use with CAN013-ST,.125" dia.
Hach Company Stopper, Rubber, One Hole, Size 8, 1/pk
#8 Black SBR stopper, complete with one 7/8 inch diameter drilled center hole. 1/pk.