Patent ID: 7148300

Claim:
A compound comprising: (a) an amorphous copolymer including interpolymerized units derived from one or more perfluorinated ethers of the formula: CF 2 ═CFO—(CF 2 ) m —(O(CF 2 ) p ) n —OR f (Formula 1) wherein R f is a perfluorinated (C1–C4)alkyl group, m=1–4, n=0–6, and p=1–2, or CF 2═ CF(CF 2 ) m —O—R f (Formula II) wherein: m=1–4; R f is a perfluorinated aliphatic group optionally eontaining O atoms; and (b) a curable component including at least one filler, present in an amount of at least 10 parts per 100 parts of component (a), such that upon vulcanization the resulting compound has a Shore A hardness according to ASTM D2240 of 60 or greater, a TR-10 of −25° C. or less, and a permeation rate of 65 (g-mm/m 2 -day) or less.