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
Med Vet International Compression Plate 4.5mm, 3 holes, 55mm L, J0427B
Use with 4.5mm cortical screws to produce fracture-site compression.
Chemglass Life Sciences Septum Stopper, Sleeve Type, For 19/22-19/38 Outer Joints, Red
Septum Stopper, Sleeve Type, For 19/22-19/38 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 The diaphragm can be punctured with a syringe needle, re-sealing after the needle is withdrawn.
Chemglass Life Sciences PTFE/Silicone Stopper
Replacement PTFE/silicone stopper for Multi-Tier Reaction plates (CG191501, CG191502, CG191503).
Chemglass Life Sciences Septum Stopper, Sleeve Type, for 5mm OD NMR Tubes, Red
Septum Stopper, Sleeve Type, for 5mm OD NMR Tubes, 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.
Accuflow Systems Saint-Gobain Versilic Stopper, Silicone, 5 x 9 x 20 mm
Versilic silicone stoppers, 5 x 9 x 20 mm, provide a tight laboratory seal for tubes, flasks, and vessels. Molded from silicone, they offer broad chemical compatibility and a wide operating temperature range suitable for routine biological and biopharmaceutical workflows.
- Silicone material
- Dimensions: 5 x 9 x 20 mm (0.197 x 0.355 x 0.788 in)
- Pack quantity: 10 per pack
- Withstands temperatures from -70 °C to 250 °C (-94 °F to 482 °F)
- Suitable for biology, hematology, microbiology, and biopharmaceutical applications
- Meets FDA and BGA standards
Grainger K4796 Silicone Round Cord 1/4 D 100 L 70A Blue
The Silicone Round Cord from Grainger is a flexible, durable silicone cord that can withstand temperatures from -100 to 500°F. It has a round cross-section and comes in multiple diameters from 1/16 inch to 3/4 inch. The cord is made from platinum-cured silicone which provides excellent resistance to weathering, aging, moisture, and UV rays. With the ability to tie knots without weakening, this silicone cord has many potential uses including automotive, HVAC, marine, and more. The cord comes in standard lengths of 25 feet and 50 feet.
Grainger K4796 Silicone Round Cord 3/32 D 10 L 70A Blue
The Silicone Round Cord Metal is a silicone rubber cord with a metal core that is flexible and durable. It is made of high quality silicone rubber with a stainless steel wire core and has excellent resistance to extreme temperatures, sunlight, moisture, and chemicals. This cord comes in multiple diameters from 1/8 inch to 3/4 inch and is sold by the foot, with a minimum order of 1 foot. It can withstand temperatures ranging from -85°F to 500°F. Potential applications include automotive, HVAC, marine, and appliance uses. This product is manufactured in the USA.
