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
Enterprise Technology Solutions 40-Sheet Ez Squeeze Two-Hole P
40-Sheet Ez Squeeze Two-Hole Punch 9/32 Holes Black/silver
Cole-Parmer Essentials Two-Hole Black Rubber Stoppers, Standard Size 1; 63/Pk
These two-hole black stoppers made with solid natural rubber stay pliable over a long period of time. Provide good tightness and adhesion, withstand laboratory conditions without hardening, and are ideal for use with nonaggressive or low concentration solutions. Each stopper has its size marked in raised figures. Low sulfur content. Withstand temperatures from 13 to 158F (25 to 70C).
Chemglass Life Sciences Septum Stopper, Sleeve Type, For 19/22-19/38 Outer Joints, White
Septum Stopper, Sleeve Type, For 19/22-19/38 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 Rubber Stopper, #8, Two Holes, Black
Rubber Stopper, #8, 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 (41mm), Bottom (33mm). Length: (25mm). Diameter of holes: (5mm).
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 M27 Blind Stopper for Bioreactor Head Plate (Chemglass CLS-1385-14)
The M27 Blind Stopper is a threaded blind plug designed to close unused M27 threaded ports on bioreactor head plates. It provides a corrosion-resistant closure for unused openings and is suitable as a replacement component in laboratory bioreactor assemblies.
- Constructed from 316L stainless steel.
- Electropolished surface finish of 20Ra or better.
- Threads into M27 ports from the outside to close unused openings.
- Designed for use with bioreactor head plates and assemblies.
- Compatible with common bioreactor systems; replacement silicone o-ring available.
Hach Company SC4200c hole plug kit M20
This neoprene plug can be purchased as a replacement part in order to seal any of the five open holes in the SC4200 controller The plug does not allow for cable pass through
Hach Company Plastic BOD Bottle Stoppers
Unbreakable acrylic stopper for 300 mL BOD disposable bottles Qty 1
Grainger Stopper Sz 5.5 24 mm BDia Black 0 PK26
The 16ZD51 is a 3M Novec 1230 Clean Agent Fire Extinguisher. It is UL rated 2-B:C and contains 1.4 gallons of Novec 1230 fluid. This clean agent extinguisher is intended for Class A, B, and C fires. It features an all-steel valve construction with stainless steel valve stems. The cylinder is made of steel that is coated with red enamel paint. This extinguisher has a discharge range of 10-15 feet and should be inspected annually. It does not contain any ozone depleting substances.
Ace Glass, Inc. Stopper, cone, 69mm OD top, 45mm OD bottom, black neoprene, pk12
Stopper, cone, 69mm OD top, 45mm OD bottom, black neoprene, pk12
Chemglass Life Sciences Solid Rubber Stopper, #7, Black
Solid Rubber Stopper, #7, 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 (37mm), Bottom (30mm). Length: (25mm).