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).
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.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #00, 15 x 10 x 25mm, 106 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.
Chemglass Life Sciences Foam Plug, fits 66-75mm Openings
Foam Plug, fits 66-75mm Openings. Identi-Plugs are for use with test tubes and flasks. They are reusable and leave no clinging fibers like cotton plugs. They provide a snug fit, yet permit free air flow. Plugs are ideal for use with Drosophila vials. They spring back to original shape after repeated use. Identi-Plugs can also be used as a cleaner for lab pipettes, tubes, vials, as well as industrial precision tubing. Plugs are approximately 1.75" long.
Hach Company Stopper, Neoprene, Solid, Size 2, 12/pk
Recommended where natural rubber would deteriorate or be attacked.
Research Products International Corp Laboratory Grade Rubber Stopper, Black SBR Rubber, Size #12, 64 x 54 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.
Ace Glass, Inc. Septa, white rubber, sized for 13-18mm OD tubes, pk/72
Septa, white rubber, sized for 13-18mm OD tubes, pk/72
Chemglass Life Sciences Stopper, #15 O-Ring Joint, Airfree, Schlenk
Stopper, #15 O-Ring Joint, Airfree, Schlenk. For use with the AF-0060 or AF-0061 manifolds or any Airfree component with an o-ring as a closure. Supplied complete with one Viton O-Ring.
Hach Company Stopper, Ground-glass for BOD bottles
Ground glass stopper for BOD bottles (60 and 300 mL sizes).
Chemglass Life Sciences Septum Stopper, Suba-Seal, For 29/26-29/42 Outer Joints and 25.5mm ID Tubing
Septum Stopper, Suba-Seal, For 29/26-29/42 Outer Joints and 25.5mm ID Tubing. Suba-Seal septa are a flanged stopper with a hollow plug and sleeve extension that folds down over the neck of the vessel. In addition to the pull over sleeve, Suba-Seal stoppers have a series of annular serrations on the plug portion of the septa. Each of these serrations depress along the inner wall of the glass vessel to form an extremely effective air-tight seal. Stoppers are made from natural red rubber and sold in the package quantities listed below.