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
Cole-Parmer Solid Color-Coded Silicone Stoppers, Standard Size 6.5, Yellow; 10/Bag
Stoppers Silicone Sz 6.5 10/bg
Cole-Parmer Solid Color-Coded Silicone Stoppers, Standard Size 9.5, Pink; 5/Bag
Silicone bubbles make these stoppers lightweight—they float on water. Withstand temperatures from –76 to 392°>F (–60 to 200°>C). Stoppers are available in 14 color-coded sizes, given in both standard and Japanese size numbers. Softness and flexibility allow stoppers to fit a range of holes. Easily make openings for glassware fit your exact specifications with the optional cork borer set. 2 bg/cs.*
Accuflow Systems Saint-Gobain Silicone Stopper, Size 3, Platinum-Cured Silicone, Autoclavable
Sani-Tech silicone stopper size 3 is an ultra-pure, platinum-cured silicone closure engineered for laboratory and bioprocess applications. It offers high purity, resistance to cracking and spallation, and is fully autoclavable for sterile processing.
- Ultra-pure platinum-cured silicone.
- Size 3, suitable for carboys and solution bottles.
- Dimensions: A 0.950 in (24.1 mm), B 0.725 in (18.4 mm), H 0.982 in (24.9 mm).
- Fully autoclavable and sterilizable.
- Resists cracking and spallation, minimizes particulate release.
- Common applications include process and storage procedures and laboratory apparatus.
Grainger K4796 Silicone Round Cord 5/16 D 25 L 70A Blue
The Silicone Round Cord Metal is a silicone rubber cord with a metal core that is flexible and durable. It has a temperature range of -60°F to 500°F and comes in multiple diameters and lengths. The cord has good electrical insulation properties and high tensile strength. It is often used for applications like weatherstripping, gasketing, binding, and holding. This product can provide flexibility while maintaining shape in high heat environments. The metal core offers rigidity while the silicone exterior provides insulation against electricity, moisture, and weather.
Grainger K4796 Silicone Round Cord 3/16 D 10 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 its high flexibility and temperature resistance, this silicone cord is ideal for a variety of applications including gaskets, seals, hose fabrication, and more. The cord can be cut to desired lengths.
Cayman Chemical 384-Wel SolId Platelow vol 1ea
A 15-LO-1 inhibitor (Ki 3.3 UM) a P. falciparum aspartate carbamoyltransferase inhibitor (IC50 3.32 UM) reduces LPS-induced expression of the mRNAs encoding TNF-a iNos Il-1B Il-6 Il-8 and Il-12b in mouse lung slices at 50 UM inhibits glutamate-induced increases in lipid peroxidation and mitochondrial superoxide formation as well as cell death in mouse HT22 cells at 10 UM
Cayman Chemical 384-Wel SolId Platelow vol 5ea
A 15-LO-1 inhibitor (Ki 3.3 UM) a P. falciparum aspartate carbamoyltransferase inhibitor (IC50 3.32 UM) reduces LPS-induced expression of the mRNAs encoding TNF-a iNos Il-1B Il-6 Il-8 and Il-12b in mouse lung slices at 50 UM inhibits glutamate-induced increases in lipid peroxidation and mitochondrial superoxide formation as well as cell death in mouse HT22 cells at 10 UM
Cayman Chemical 96-Wel SolId Plateblack 1ea
An uncoated flat-bottom 96 well plate for use in fluorescence or chemiluminescent assays.
WEST PHARMACEUTICAL SERVICES INC 13MM S2-F451 STOPPER 1000/CS
NC2220919 13MM S2-F451 STOPPER 1000/CS
