abstract |
(57) [Summary]nAn aerosol delivery device comprising a casing member, a valve stem and a diaphragm. This diaphragm was made of ethylene-propylene-diene rubber (“EPDM”) and exposed to 1,1,1,2,4-tetrafluoroethane or 1,1,1,2,3,3,3-heptafluoropropane. Sometimes stable against dimensional changes. |