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 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.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #11 1/2, 63 x 50 x 25mm, 5 per Package
Laboratory Grade Rubber Stoppers offered in a wide range of common sizes for most laboratory applications. Available standard black SBR rubber. Solid rubber stoppers are molded in the USA according to standard industry size specification. Packaged in approximately one pound packages.
West Pharmaceutical Services Inc 20mm Serum FluroTec™ Barrier Film-Laminated Ready-to-Sterilize Bromobutyl 4023/50 Stoppers with Envision™ Verification Process, Qty. 3,000 stoppers/bag
FluroTec™ barrier film-laminated serum stoppers are made from 4023/50 a bromobutyl elastomer and laminated with FluroTec™ barrier film to reduce the risk of a chemical interaction. These components are provided washed (ready-to-sterilize) and 100% vision inspected. This stopper configuration can be used with European blowback, North American blowback, or straight wall (no blowback) vials. West item number:10145417.
Grainger WallPlate Blank 2 Hole White
The Monoprice Wall Plate is a single-gang Decora style wall plate made of high-impact plastic in white color. It features a flat design with rounded corners and measures 4.69 x 2.75 x 0.12 inches. This wall plate has a smooth finish and includes 1 Decora opening, allowing the installation of a single Decora rocker switch, outlet, jack or other device. It can be installed over any standard single-gang US electrical box and is UL and CUL listed. The wall plate is designed for indoor use.
West Pharmaceutical Services Inc 20mm NovaPure® Ready-to-Sterilize Bromobutyl 4023/50 Serum Stoppers, Qty. 3,000 stoppers/bag
NovaPure® serum stoppers are made from 4023/50 a premium quality bromobutyl elastomer with West’s lowest particulate specification available. Laminated with FluroTec™ barrier film to help reduce particulate, limit drug interaction with the elastomer and reduce leachables. These components are provided washed (ready-to-sterilize) and 100% vision inspected. This stopper configuration can be used with European blowback, North American blowback, or straight wall (no blowback) vials. West item number: 70025047
Ace Glass, Inc. Bubbler stopper only, #7 Ace-Safe™; hose connections, porosity B (70-100 micron) tip
Bubbler stopper only, #7 Ace-Safe™; hose connections, porosity B (70-100 micron) tip