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
Research Products International Corp Laboratory Grade Rubber Stoppers, Green Neoprene Rubber, Size #3, 35 per Pack
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.
Quality Lab Accessories SET SCREW STYLE CANNULA STOPPR
Adjustable Cannula Stopper with set screw for Sotax (use with CAN013-ST,.125" dia.
West Pharmaceutical Services Inc 20MM NOVAPURE STOPPERS 500/BAG
This item has a minimum order quantity of 20 packs per supplier requirements
Chemglass Life Sciences Rubber Stopper, #14, One Hole, Black
Rubber Stopper, #14, One Hole, 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 (90mm), Bottom (75mm). Length: (39mm). Diameter of hole: (5mm).
Grainger Stopper Sz 13 58 mm BDia Black 0 PK5
The 16WC37 is a 16-inch diameter, 3-blade, cast aluminum propeller made by Sensenich Propeller Manufacturing Company. It has a pitch of 37 inches and is designed for experimental aircraft with engines from 65 to 85 horsepower. The propeller is manufactured from heat treated aluminum alloy for strength and durability. It has a standard 1-inch diameter propeller shaft hole and includes all mounting hardware. The 16WC37 provides efficient thrust while minimizing noise and vibration. With proper engine matching, it is an ideal propeller upgrade for many experimental amateur-built aircraft.
Chemglass Life Sciences Solid Rubber Stopper, #00, Black
Septum Stopper, Sleeve Type, For 29/26-29/42 Outer Joints, 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. This item is RED rubber.
Cole-Parmer Solid Black Rubber Stoppers, Standard Size 2; 52/Pk
Black rubber stoppers stay pliant over a long period and withstand laboratory conditions without hardening. Stoppers retain resiliency even after repeated autoclaving. Each stopper has its size in raised figures on top. Contain some sulfur. Autoclavable.
West Pharmaceutical Services Inc 20MM NOVAPURE LYO STOPRS 2K/PK
NC3812723 20MM NOVAPURE LYO STOPRS 2K/PK