| 摘要 |
The valve for an aerosol container comprises a valve body (1) defining an aperture, a seal (9) mounted at the aperture, and a valve stem (7) having a dispensing passage (15), the valve stem (7) being slideably moveable through the seal (9) such that in a first position the valve is closed to prevent the substance to be dispensed from entering the dispensing passage (15), and in a second position the valve is opened to allow the substance to be dispensed through the dispensing passage (15). The seal (9) is made from a material comprising a fluorine-containing polymer, such as polytetrafluoroethane, ethylenetetrafluoroethylene, perfluoroalkoxyalkane, fluorinated ethylenepropylene, polyvinyldienefluoride and chlorinated ethylene tetrafluoroethylene.
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