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, #4, Two Holes, Black
Rubber Stopper, #4, Two Holes, Black. Similar to CG-3026 and CG-3027 except with two holes. 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 (26mm), Bottom (20mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Rubber Stopper, #10-1/2, Two Holes, Black
Rubber Stopper, #10-1/2, Two Holes, Black. Similar to CG-3026 and CG-3027 except with two holes. 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 (53mm), Bottom (45mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences Rubber Stopper, #13, One Hole, Black
Rubber Stopper, #13, 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 (68mm), Bottom (58mm). Length: (25mm). Diameter of hole: (5mm).
Chemglass Life Sciences Rubber Stopper, #9-1/2, Two Holes, Black
Rubber Stopper, #9-1/2, Two Holes, Black. Similar to CG-3026 and CG-3027 except with two holes. 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 (46mm), Bottom (38mm). Length: (25mm). Diameter of holes: (5mm).
Chemglass Life Sciences #27 PTFE Stopper, Red Handle, Hollow
#27 PTFE Stopper, Red Handle, Hollow. Flask length PTFE stopper with color coded handle.
Chemglass Life Sciences Stopper, #20 O-Ring Joint, Airfree, Schlenk
Stopper, #20 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.
Bellco Glass, Inc. Rubber STOPPER,#0
A laboratory rubber stopper is mainly used in chemical laboratory in combination with flasks and test tub. Made from rubber Closure of flask Size: 0 Top dia: 17mm Bottom dia: 13.5mm Length: 25mm
Bellco Glass, Inc. Amber R.A.M Vial,2.0mL 9mm Thd - 12x32mm
Manufactured from type 1 class a Borosilicate glass. Amber vials are manufactures from type 1 amber glass. these vials fit most auto-sampler. Designed for use with varian and other auto-samplers. MADE IN THE USA Size: 12x32mm Amber & clear vials available
Ace Glass, Inc. Full-length hollow glass stopper with 45/50 standard taper joint.
Full-length hollow glass stopper with 45/50 standard taper joint.
Ace Glass, Inc. Septa, red rubber, sized for 24/40 joints, sp/12
Septa, red rubber, sized for 24/40 joints, sp/12
Ace Glass, Inc. Septa, red rubber, sized for 8mm OD tubing, sp/12
Septa, red rubber, sized for 8mm OD tubing, sp/12
Ace Glass, Inc. Septa, white rubber, sized for 14/20 joints, sp/12
Septa, white rubber, sized for 14/20 joints, sp/12
Ace Glass, Inc. Septa, red rubber, sized for 24/40 joints, pk/144
Septa, red rubber, sized for 24/40 joints, pk/144
Accuflow Systems Saint-Gobain Silicone Stopper, Sani-Tech, 1.256 x 1.041 in, Autoclavable
Autoclavable biopharmaceutical-grade platinum-cured silicone stopper engineered for vessel and bottle sealing. The stopper resists cracking and particle migration, and is compatible with common laboratory sterilization methods.
- Platinum-cured silicone.
- Dimensions A x B x H: 1.256 x 1.041 x 0.915 in (31.9 x 26.4 x 23.2 mm).
- Volume: 0.947 in³ (15.52 cm³).
- Weight: 0.040 lb (18.14 g).
- Sterilization: autoclavable; radiation up to 2.5 Mrad (25 kGy); ethylene oxide.
- Compliance: tested to USP Class VI and meets FDA 177.2600 criteria.
- Manufacturing: lot traceability and ISO 9001 production available for custom options.
- Typical applications: carboys, solution and media bottles, process and laboratory apparatus.