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 Stopper #22, Pennyhead, Flask Length, Solid
Stopper #22, Pennyhead, Flask Length, Solid. All sizes are solid with the exception of the #38 (CG-3018-08) which is hollow.
Thomas Scientific Stopper, Schoniger, 300/500 mL
6513C60 stopper was traditionally offered by Thomas for 300/500 mL combustion flasks; glass tip extends 50 mm below ground joint 6513C65 stopper is used for 1,000 mL combustion flasks; glass tip extends 90 mm below ground joint All feature U-shaped platinum gauze with 3 mm opening for insertion of the sample wrapper. For replacement Platinum Carrier, see Thomas number 6514F55.
WEST PHARMACEUTICAL SERVICES INC 13MM READY PACK NOVPUR 4023/50
NC2204939 13MM READY PACK NOVPUR 4023/50
Chemglass Life Sciences Stopper, Hex Head, Hollow, 24/40
Stopper, Hex Head, Hollow, 24/40. Hexagonal shaped head of stopper prevents it from rolling off of the bench top. Flat surface will also permit stopper to be inverted and placed on end, thereby preventing possible contamination of ground surface.
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, 45mm, Anaerobic Flange, Grey Bromobutyl Rubber
¿ Stopper shape, and material properties optimized to fit GL45 bottles with sizes from 100mL to 20L. ¿ Low permeability to air, gases and moisture. ¿ Manufactured from a high purity bromobutyl rubber elastomer. ¿ Conforms to EP 3.2.9 Type I closure for chemical and penetration tests. ¿ Material is virtually free of organics that might leach into the incubation medium. ¿ Elastic material for effective sealing and reliable self-sealing after needle piercing. ¿ Upper surface features seven numbered hemispherical impressions for needle-piercing. ¿ Wide usable temperature range: -50 to +121 ¿C. ¿ Suitable for autoclaving / steam sterilizing at 121 ¿C for 20 minutes.
Research Products International Corp Laboratory Grade Rubber Stoppers w/Hole, BLK SBR Rubber, Size #8, 41 x 33 x 25mm, 10 per Package
Laboratory Grade Rubber Stoppers with hole are offered in a wide range of common sizes for most laboratory applications. Available standard black SBR rubber. Material can typically withstand temperatures up to about 100°C (212°F). Rubber stoppers with hole are molded in the USA according to standard industry size specification.
Packaged in approximately one pound packages.
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.
Chemglass Life Sciences Septum Stopper, Sleeve Type, For 24/40-24/25 Outer Joints, Red
Septum Stopper, Sleeve Type, For 24/40-24/25 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.