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 13 58 mm BDia Black 0 PK5
Grainger is a leading distributor of industrial supplies and equipment. Their catalog offers over 1.5 million products from thousands of trusted brands. Products range from safety supplies, lighting, material handling, power tools, pumps, motors, HVAC and more. Grainger helps businesses simplify purchasing with next-day delivery, easy online ordering, and 24/7 customer service. Their catalog provides detailed product information like specs, images, videos and 360 product views. Grainger aims to help businesses get the job done efficiently.
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 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 2 16 mm BDia Black 0 PK25
The Grainger Approved 2-1H Stopper Sz 2, 16 mm BDia, Black 0 PK25 is a rubber stopper made of black butyl rubber. It has an outer diameter of 16 mm, an inner diameter of 6 mm, and a length of 16 mm. This stopper is designed to provide a tight seal and fit snugly into containers. It comes in a pack of 25 stoppers. The stoppers are rated to withstand temperatures between -65 to 250°F. This product can be used to plug bottles, vials, tubes and other containers in laboratory, industrial, and chemical processing applications. The black color provides contrast for easy visual inspection.
Grainger Stopper Sz 11.5 50 mm BDia Black 0 PK6
The 16VC10 is a 10-gallon, vertical, oil-lubricated air compressor from Ingersoll Rand. It has a 2-stage pump that delivers 16 CFM at 175 PSI with a maximum pressure of 175 PSI. The motor is 5 HP, 230V, 1 phase. It has a cast iron cylinder and an ASME coded air receiver tank. The compressor includes an aftercooler, belt guard, and automatic tank drain. This air compressor is designed for automotive service, body shops, fleet maintenance, machine shops, production lines, wood working, dry cleaners, car washes, general maintenance/repair shops, tire shops, and other light industrial applications. The 16VC10 provides a reliable supply of quality air for air tools and other pneumatic equipment.
Cayman Chemical 384-Wel SolId Platelow vol 5ea
A 15-LO-1 inhibitor (Ki 3.3 UM) a P. falciparum aspartate carbamoyltransferase inhibitor (IC50 3.32 UM) reduces LPS-induced expression of the mRNAs encoding TNF-a iNos Il-1B Il-6 Il-8 and Il-12b in mouse lung slices at 50 UM inhibits glutamate-induced increases in lipid peroxidation and mitochondrial superoxide formation as well as cell death in mouse HT22 cells at 10 UM
Cayman Chemical 96-Wel SolId Plateblack 1ea
An analytical reference standard categorized as a piperazine intended for research and forensic applications
Cayman Chemical 384-Wel SolId Platelow vol 1ea
A 15-LO-1 inhibitor (Ki 3.3 UM) a P. falciparum aspartate carbamoyltransferase inhibitor (IC50 3.32 UM) reduces LPS-induced expression of the mRNAs encoding TNF-a iNos Il-1B Il-6 Il-8 and Il-12b in mouse lung slices at 50 UM inhibits glutamate-induced increases in lipid peroxidation and mitochondrial superoxide formation as well as cell death in mouse HT22 cells at 10 UM
Enterprise Technology Solutions 20-Sheet Ez Squeeze Two-Hole P
20-Sheet Ez Squeeze Two-Hole Punch 9/32 Holes Black/silver
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 #16 PTFE Stopper, Blue Handle
#16 PTFE Stopper, Blue Handle. Flask length PTFE stopper with color coded handle.
Chemglass Life Sciences Stopper, PTFE, Hollow, 29/42
Stopper, PTFE, Hollow, 29/42. Hollow PTFE stopper.