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 Septum Stopper, Sleeve Type, For 14/20-14/35 Outer Joints, Red
Septum Stopper, Sleeve Type, For 14/20-14/35 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 The diaphragm can be punctured with a syringe needle, re-sealing after the needle is withdrawn.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 Septum Stopper, Suba-Seal, For 24/25-24/40 Outer Joints and 20.5mm ID Tubing
Septum Stopper, Suba-Seal, For 24/25-24/40 Outer Joints and 20.5mm ID Tubing. Suba-Seal septa are a flanged stopper with a hollow plug and sleeve extension that folds down over the neck of the vessel. In addition to the pull over sleeve, Suba-Seal stoppers have a series of annular serrations on the plug portion of the septa. Each of these serrations depress along the inner wall of the glass vessel to form an extremely effective air-tight seal. Stoppers are made from natural red rubber and sold in the package quantities listed below.
Chemglass Life Sciences Septum Stopper, Sleeve Type, for 8mm OD Standard Wall or 9mm OD Medium Wall, White
Septum Stopper, Sleeve Type, for 8mm OD Standard Wall or 9mm OD Medium Wall, 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 Septum Stopper, Sleeve Type, For 24/40-24/25 Outer Joints, Red
Septum Stopper, Sleeve Type, For 24/40-24/25 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 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 Septum Stopper, Sleeve Type, For 24/40-24/25 Outer Joints, White
Septum Stopper, Sleeve Type, For 24/40-24/25 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 Septum Stopper, Sleeve Type, For 29/26-29/42 Outer Joints, Red
Septum Stopper, Sleeve Type, For 29/26-29/42 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 Stopper, Flask Length, PTFE, Size 19
Stopper, Flask Length, PTFE, Size 19. PTFE stopper for use in flask length outer joints.
Chemglass Life Sciences Stopper, Flask Length, PTFE, Size 9
Stopper, Flask Length, PTFE, Size 9. PTFE stopper for use in flask length outer joints.
Chemglass Life Sciences Stopper, Safe-Lab, Flask Length, PTFE, Size 22
Stopper, Safe-Lab, Flask Length, PTFE, Size 22. Flask length PTFE stopper has a Polypropylene extraction nut permitting easy removal of the stopper from the flask. All sizes are solid.
Chemglass Life Sciences Stopper, PTFE, Hollow, 45/50
Stopper, PTFE, Hollow, 45/50. Hollow PTFE stopper.
Chemglass Life Sciences #27 PTFE Stopper, Red Handle, Hollow
#27 PTFE Stopper, Red Handle, Hollow. Flask length PTFE stopper with color coded handle.
Chemglass Life Sciences #22 PTFE Stopper, Yellow Handle
#22 PTFE Stopper, Yellow Handle. Flask length PTFE stopper with color coded handle.
Chemglass Life Sciences #16 PTFE Stopper, Blue Handle
#16 PTFE Stopper, Blue Handle. Flask length PTFE stopper with color coded handle.