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 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.
Chemglass Life Sciences Nylon Loosening Nut, 24/40, 10mm
Nylon Loosening Nut, 24/40, 10mm. Replacement part for CG2077H series of PTFE stirrer bearings.
Chemglass Life Sciences 14/20 Stopper, Solid
14/20 Stopper, Solid. PTFE stopper has a Polypropylene extraction nut permitting easy removal of the stopper from the glass outer joint. The 14/20 and 19/22 are solid, while the larger sizes are hollow.
Chemglass Life Sciences Septum Stopper, Sleeve Type, for 5mm OD NMR Tubes, Red
Septum Stopper, Sleeve Type, for 5mm OD NMR Tubes, Red. 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.
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.
Chemglass Life Sciences Stopper, PTFE, Hollow, 19/22
Stopper, PTFE, Hollow, 19/22. Hollow PTFE stopper.
Chemglass Life Sciences 34/45 Stopper, Hollow
34/45 Stopper, Hollow. PTFE stopper has a Polypropylene extraction nut permitting easy removal of the stopper from the glass outer joint. The 14/20 and 19/22 are solid, while the larger sizes are hollow.
Chemglass Life Sciences Vacuum Trap Stopper Only, 55/50
Vacuum Trap Stopper Only, 55/50. Replacement part for CG451610 vacuum trap.
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 CG451410.
Chemglass Life Sciences Vacuum Trap Stopper Only, 29/42
Vacuum Trap Stopper Only, 29/42. Replacement part for CG451601 vacuum trap.
Chemglass Life Sciences Vacuum Trap Stopper Only, 50/50
Vacuum Trap Stopper Only, 50/50. Replacement part for CG451610 vacuum trap.