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 16 90 mm BDia Black 0
The Grainger Approved 16-004 Stopper is a black rubber stopper with a 16 mm diameter and 90 mm length. It has a solid top and hollow bottom to fit various sized containers and test tubes. The stopper is made from high quality SBR rubber that resists cracking and provides an airtight seal. It can withstand temperatures from -20°F to 250°F. The stopper meets ASTM D3574 standards for rubber stoppers. It comes individually packaged. This basic rubber stopper is suitable for home, school, industrial, and laboratory use.
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.
Sigma Aldrich Fine Chemicals Biosciences Precision SealR rubber sep
The recommended choice for use with organic chemicals and solvents pressure applications and cannulation techniquesPrecision Seal septa are designed specifically for the rigorous requirements of chemical applications.Precision fit Precision Seal septa have a longer tapered plug that seats firmly inside the glass joint or tube providing a sealing surface that is 50 to 80% greater than standard sleeve stoppers. The inner seal design of Precision Seal septa minimizes chemical and solvent vapor migration up the joint to the sleeve which can swell leak or fail from exposure. The surface texture of the rubber is similar to that of a ground glass joint and resists movement once seated.Non-contaminating Precision Seal natural rubber is lower in solvent extractables 1.9% vs. standard sleeve stoppers 5-6%. Precision Seal rubber is higher in density to minimize the effects of solvent degradation. They are manufactured from a single certified lot for absolute consistency.Safet
Chemglass Life Sciences Solid Rubber Stopper, #9-1/2, Black
Solid Rubber Stopper, #9-1/2, 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 (46mm), Bottom (38mm). Length: (25mm).
Bellco Glass, Inc. Septum Stopper, 20mm Blue Butyl Rubber
Manufactured from blue Chlorobutyl. The septum stopper can withstand autoclaving 160 degree Celsius at normal autoclaving times 12-20 minutes. Autoclaving: no higher than 160 degree Celsius. FOR 2048-00150 - ANAEROBIC TUBES. DIMENSIONS: 19.5mm @ TOP, 14mm LONG, 14.5-13.5mm TAPER. MADE IN THE USA. Size: 20mm
Chemglass Life Sciences Rubber Stopper, #00, Two Holes, Black
Rubber Stopper, #00, 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 (15mm), Bottom (10mm). Length: (25mm). Diameter of holes: (3mm).
Accuflow Systems Saint-Gobain Versilic Stopper, Silicone, 8D, 20 mm
Peroxide-cured silicone stoppers designed for laboratory use. These chemically and biologically neutral closures are non-toxic, odorless, non-adherent, and resistant to aging. They withstand a wide temperature range and meet common laboratory standards, making them suitable for tissue culture and general laboratory containment.
- Material: Peroxide-cured silicone.
- Dimensions: Bottom 4 mm, Top 8 mm, Height 20 mm.
- Temperature range: -70°C to 250°C (-94°F to 482°F).
- Compliance: DIN 18271, FDA/BGA approvals.
- Pack quantity: 500 per pack.
- Properties: Chemically and biologically neutral, non-toxic, odorless, non-adherent, resistant to aging.
- Applications: Tissue culture, microbiology, hematology, food science, laboratory containers.
Research Products International Corp Laboratory Grade Rubber Stoppers, Green Neoprene Rubber, Size #8, 41 x 33 x 25mm, 12 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 15 83 mm BDia Black 0
The 16WC61 is a 16 oz. claw hammer by Estwing Manufacturing Company. It has a forged steel head and neck with a shock-reducing vinyl grip. The claw is curved for easier nail pulling. This American-made hammer is designed for general purpose use driving and pulling nails. It measures 16 inches long and weighs 1.5 pounds. The head measures 4 inches across.
Electron Microscopy Sciences Lyophilization Three Leg Stoppers Gray, 13 mm I.D., 20 mm O.D.
Manufactured from the highest quality raw materials. Fits mouth with:
I.D.: 13 mm
O.D.: 20 mm
Material: Gray holobutyl/50
