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
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.
Grainger Stopper Sz 5.5 24 mm BDia Black 0 PK28
The 16ZD52 is a 3M Scotch-Brite General Purpose Hand Pad, 6" x 9", from Grainger. It features an open web construction that cleans effectively without scratching. The pad is made of high-quality fibers and resin that resist shedding. It can be used for light scrubbing and cleaning of surfaces. This durable hand pad measures 6 inches by 9 inches. It provides versatile cleaning action for dishes, pots, pans, sinks, countertops, appliances, outdoor furniture, grills, and more. The 3M Scotch-Brite General Purpose Hand Pad is ideal for everyday cleaning tasks.
Chemglass Life Sciences Replacement Luer Stopper
Replacement Luer Stopper. Replacement luer stopper for CG-1158 caps.
Chemglass Life Sciences Septum Stopper, Sleeve Type, For 29/26-29/42 Outer Joints, White
Septum Stopper, Sleeve Type, For 29/26-29/42 Outer Joints, White. 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.
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.
Uline Rubber Pressure Pad For 24" Foot-Operated Impulse Sealer
Rubber Pressure Pad For 24IN Foot-Operated Impulse Sealer
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
MSC Nylon Cap Nut, 5/16-18 Thread, Made in USA
This nylon cap nut is designed for fastening applications where a protective and insulating cover over exposed bolt threads is required. It features a 5/16-18 thread for secure attachment.
- Constructed from durable nylon.
- Features a 5/16-18 thread size.
- Provided in a pack of 15.
- Manufactured in the USA.
Ace Glass, Inc. #9 PTFE Stopper with Polypropylene Extraction
#9 standard taper PTFE stopper with polypropylene extraction nut for easy removal from outer joints.
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