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 Vacuum Trap Stopper Only, 55/50
Vacuum Trap Stopper Only, 55/50. Replacement part for CG451520.
Chemglass Life Sciences Vacuum Trap Stopper Only, 50/50
Vacuum Trap Stopper Only, 50/50. Replacement part for CG451504.
Bellco Glass, Inc. Polypropylene Volumetric Flask W/Polypropylene Stopper,25mL 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: 25ml Accuracy +/- ml: 0.06 Height: 115mm Stopper size: 10/19
Bellco Glass, Inc. KAP-UTS/Blue,16mm
Manufactured from non-toxic autoclavable polypropylene. Ideal for culture tubes and flasks with DeLong style neck and access ports. Same evaporation and sterility characteristics as stainless steel closures. Molded pressure fins for firm grip. There are seven colors and six sizes form 13mm to 38mm. MADE IN THE USA. Case quantity 1000, Color Blue, 16mm
Chemglass Life Sciences Midget Impinger, Plain Top, Fritted Tube, Graduated, Stopper Only
Stopper Only. Replacement stopper for the CG182101 midget impinger.
Chemglass Life Sciences Stopper Only, 250mL Gas Washing Bottle
Stopper Only, 250mL Gas Washing Bottle. Stopper is held in place with two CG-110-02, 18mm Stainless Steel springs. Springs are supplied when bottle is ordered complete. Image shown is the complete bottle.
Cole-Parmer Solid Color-Coded Silicone Stoppers, Standard Size 2, Pink; 20/Bag
Cole-Parmer Solid Color-Coded Silicone Stoppers, Standard Size 2, Pink; 20/Bag, Silicone bubbles make these stoppers lightweight—they float on water. Withstand temperatures from –76 to 392°>F (–60 to 200°>C).
DATWYLER PHARMA PACKAGING USA INC V9024 RFS STOPPERS 16000 PCS
NC3856757 V9024 RFS STOPPERS 16000 PCS
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.
Grainger Stopper Sz 13.5 62 mm BDia Black 0 PK3
The 16WC39 is a 16-ounce 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 approximately 13.25 inches long.
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 10 42 mm BDia Black 0 PK8
The Grainger 16VC04 is a 4-ton capacity chain hoist with a lift height of 20 feet. It has a cast iron body and features a load brake, slack switch, and upper and lower limit switches for added safety and control. This electric hoist requires a 230 volt 3 phase power supply and has a lifting speed of 8 feet per minute. The hoist comes with 10 feet of lift chain, hooks, and is rated for indoor and outdoor use. With proper installation and maintenance, this rugged hoist provides reliable lifting for manufacturing and industrial settings.
Grainger Stopper Sz 5 23 mm BDia Black 0 PK25
The Grainger Approved Stopper Sz 5, 23 mm BDia, Black is a rubber stopper with an overall diameter of 23mm and a body diameter of 5mm. It is made of black rubber and has a solid top design. The stopper is used to plug openings in laboratory glassware and features a tapered design for a tight fit. It provides an airtight and watertight seal and is resistant to acids, bases, and most solvents. The stopper is rated to withstand temperatures up to 200°F. It meets ASTM D3574 standards and is an economical option for basic laboratory applications. The package contains 100 stoppers.