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
Grainger Stopper Sz 8 33 mm BDia Black 0 PK12
The Grainger 16ZD72 is a 3M Speedglas Welding Helmet that features auto-darkening technology to protect the eyes and face during welding, cutting and grinding. It has a large viewing area, multiple adjustable settings like shade level and sensitivity, and comfortable padded headgear. The helmet provides versatility for different applications with grind, cut and weld modes. It meets industry safety standards. This auto-darkening welding helmet delivers reliable eye protection and visibility.
Chemglass Life Sciences Solid Rubber Stopper, #000, Black
Solid Rubber Stopper, #000, Black, Pack of 24
Chemglass Life Sciences Rubber Stopper, #11, Two Holes, Black
Rubber Stopper, #11, 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 (56mm), Bottom (48mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Rubber Stopper, #6, Two Holes, Black
Rubber Stopper, #6, 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 (32mm), Bottom (26mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Rubber Stopper, #3, Two Holes, Black
Rubber Stopper, #3, 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 (24mm), Bottom (18mm). Length: (25mm). Diameter of holes: (5mm).
Grainger Stopper Sz 0 10 mm BDia Black 0 PK50
The 16TW28 is a 16-inch diameter, two-speed, direct drive exhaust fan from Twin City Fan Companies. It features a welded steel housing with an epoxy powder coat finish and is designed for general ventilation and exhaust applications. This belt drive exhaust fan has a maximum airflow of 8,050 CFM and is available in 8 standard motor sizes ranging from 1/3 to 7.5 HP. The fan blades are made of aluminum and it can handle temperatures up to 104°F. This exhaust fan is suitable for roof or sidewall mounting.
Ace Glass, Inc. Septa, white rubber, sized for 14/20 joints, pk/144
Septa, white rubber, sized for 14/20 joints, pk/144
Ace Glass, Inc. Septa, white rubber, sized for 24/40 joints, sp/12
Septa, white rubber, sized for 24/40 joints, sp/12
Grainger Stopper Sz 11 48 mm BDia Black 0 PK7
The Grainger 16VC09 is a 16-ounce aerosol can of CRC Brakleen non-chlorinated brake parts cleaner. It is a fast drying, non-flammable spray that removes oil, grease, brake fluid, and other contaminants from brake linings and drums. It leaves no residue and can be used on metallic and non-metallic brake parts. The aerosol spray reaches hard to access areas.
Electron Microscopy Sciences Vacule Red Stoppers
Heavy wall construction, designed for lyophilization and freeze-drying. Manufactured from Wheaton 33 low extractable borosilicate glass (meets ASTM Type I Class and USP Type I Standards). Accessory for 4 ml Vacule Vials.
Grainger Stopper Sz 0 9 mm BDia Black 0 PK181
The EPDM Rubber Stopper from Grainger is a rubber stopper made from EPDM rubber. It has a diameter of 1-1/2" and a length of 1-1/2". The stopper has a solid top and no hole. It is rated for temperatures up to 250°F. The stopper provides an economical plug for closing off pipes and fittings. It creates an airtight and watertight seal. The EPDM rubber offers resistance to weather, ozone, aging, and chemicals. This stopper can be used in a variety of industrial applications.
Chemglass Life Sciences Rubber Stopper, #9, Two Holes, Black
Rubber Stopper, #9, 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 (45mm), Bottom (37mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Rubber Stopper, #5, Two Holes, Black
Rubber Stopper, #5, 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 (27mm), Bottom (23mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Solid Rubber Stopper, #6, Black
Solid Rubber Stopper, #6, 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 (32mm), Bottom (26mm). Length: (25mm).