Rubber Stoppers and Rubber Plugs
Stoppers can be made of glass, cork or rubber and are a tapered plug that is used to seal the opening of test tubes, flasks and other laboratory glassware. Rubber stoppers are however 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 it. Rubber stoppers are generally cylindrical in shape and have a tapered bottom end. Some rubber stoppers contain one or two holes to allow the insertion of pipettes, tubing or other test equipment, such as a thermometer.
What types of rubber stoppers are available?
- Turnover stoppers have external serrations providing an excellent internal seal and a flexible turnover sleeve that folds down over the container’s neck creating a double seal. The head can be easily pierced with hypodermic needles.
- Stoppers for serum bottles or vials have two or three legs with external serrations, or straight sides, and a flanged top creating an airtight seal and are ideal for research and drug applications.
- Ultra pure bromobutyl straight, plug type stoppers provide high chemical purity and low gas permeability. Lyophilisation stoppers remain stable during the transfer and sublimination phases in the freezer dryer. They have excellent performance during freeze drying processes.
- Silicone recessed septum stoppers are non-toxic, with external serrations to create an effective internal seal.
- Straight plug bromobutyl stoppers for vials and serum bottles provide maximum sealing of vials with a straight wall glass finish
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