Stopper
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A stopper is a conical closure used to seal a container, such as a bottle, tube or other conical openings.
Contents
General
A stopper has the form of a cone frustum. It is made of glass, plastic (PE, PTFE), rubber, wood (cork), cellulose fiber. Glass and plastic stoppers have a flat head, for easy grabbing, though some glass models simply have a closed glass cylinder. The glass stoppers have ground glass joint more often than not. Some plastic and rubber stoppers have holes in them, through which tubes can be inserted to inject gas in the bottle.
Availability
Stoppers can be bought from lab suppliers. Rubber and cork stoppers can be found in many hardware stores.
DIY stopper
You can make a stopper by sculpting a rod of plastic. Rubber or cork can also be used.
See also
References
Relevant Sciencemadness threads
- Ground glass stoppers
- Glass Stopper Types
- Rubber stoppers, or Glass Joints?
- Rubber stoppers
- Rubber stopper and a weird story
- Problem with a stuck rubber stopper ...
- High Temperature Stoppers
- Solid glass stopper or empty glass stopper?
- Cork stopper chemical resistant, and other information
- Need 2" stopper (tapered rubber/silicone) for HNO3 and NH3 (both in hot gaseous form)
- Frozen reagent bottle stopper
- Frozen Glass Stopper
- polypropylene caps for conc. H2SO4/HNO3
- question regarding stoppers and tubing
