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 Only, #10 Silicone, 9/16" Hole
Silicone stopper for use with the CG142001 filtration support assembly. STOPPER ONLY.
West Pharmaceutical Services Inc 20MM SERUM NOVAPURE RP S10-F45
20mm Serum NovaPure RP S10-F451 4432/50G
Chemglass Life Sciences 24/40 Stopper, Hollow
24/40 Stopper, Hollow. PTFE stopper has a Polypropylene extraction nut permitting easy removal of the stopper from the glass outer joint. The 14/20 and 19/22 are solid, while the larger sizes are hollow.
Chemglass Life Sciences Stopper, PTFE, Hollow, 14/20
Stopper, PTFE, Hollow, 14/20. Hollow PTFE stopper.
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.
Med Vet International 2.4mm x 45mm 6-Hole Compression Plate, J1074C
Many fractures in feline and small canine patients are too small for the 2.0mm DCP and the 2.7mm CDP is too large.The difference between these plates is enormous compared to the difference between 2.7 and 3.5 CDPs. The AMI (resistance to bending) of the 2.7 CDP is 20 times stiffer than the 2.0 DCP. The AMI of the 2.4 DCP is 10 times that of the 2.0 DCP.The solution is a 2.4 series of plates and screws. The plates in both size and strength are midway between 2.0 and 2.7 DCPs. The range and specifications are shown below. The standard 1.5mm hex screwdriver (used for 1.5 and 2.0 screws) is required. The pilot drill is 1.8mm and dedicated instrumentation such as load/neutral guides are also available.