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 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 Adapter, #9 O-Ring to 9mm Tubulation, Airfree, Schlenk
Replacement parts for AF-0451-01. #9 o-ring joint to 3/8" tubulation for Cajon adapters.
Chemglass Life Sciences Stopper, PTFE, Hollow, 24/40
Stopper, PTFE, Hollow, 24/40. Hollow PTFE stopper.
Cayman Chemical 96-Wel SolId Plateblack 1ea
An uncoated flat-bottom 96 well plate for use in fluorescence or chemiluminescent assays.
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 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
Chemglass Life Sciences Rubber Stopper, #1, One Hole, Black
Rubber Stopper, #1, 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 (19mm), Bottom (14mm). Length: (25mm). Diameter of hole: (4mm).
Chemglass Life Sciences Rubber Stopper, #13-1/2, Two Holes, Black
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 250¿F for 30 minutes under water or steam conditions only (not dry heat). End user must test for their specific application.
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).
Grainger Stopper Sz 13.5 62 mm BDia Black 0 PK3
The 16WC40 is a 16-inch diameter, 40-inch long, carbon steel pipe nipple with National Pipe Thread ends. It has a wall thickness of 0.280 inches and is made from ASTM A53 Grade B ERW pipe. This nipple is typically used to connect and extend threaded pipe. It can withstand pressures up to 700 psi and temperatures up to 850°F. The nipple has a black finish and weighs approximately 27 pounds. It is made in the USA.
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).