Patent ID: 6837401

Claim:
An apparatus for discharge of vapocoolants in stream or mist form including a container of pressurized vapocoolant and a valve having at least one movable valve element operating with a sealing surface for regulating the vapocoolant discharge, said sealing surface comprising a fluoroelastomer selected to have: a) a durometer change of 85±5, as measured by ASTM D2240; b) a permeability measured as product loss from the assembled can through the valve assembly by gas chromatography in the range of 1 to 1.2 g/year; c) chemical inertness in respect to ethyl chloride as characterized by gas chromatography characterization of impurities less than about 100 ppm; d) a dimensional stability that exhibits limited dimensional change equal to ±5%; e) a low solid residue in vapocoolant as characterized by an ethyl chloride USP non-volatile residue test of less than about 100 ppm.