Patent ID: 7501183

Claim:
A method of preventing or retarding corrosion by a sulfur-containing gas of electric and electronic parts, said method comprising sealing and encapsulating the electric and electronic parts with a cured product of a silicone rubber composition comprising (A) 0.5 to 90% by weight of a copper powder, (B) an organopolysiloxane containing at least two alkenyl radicals in a molecule, (C) an organohydrogenpolysiloxane containing at least two hydrogen atoms each attached to a silicon atom in a molecule, in an amount such that 0.5 to 4 mol of silicon-bonded hydrogen atoms in the organohydrogenpolysiloxane are available per mol of alkenyl radicals in the organopolysiloxane (B), and (D) a platinum group metal catalyst, the cured product of the composition being a non-conductive silicone rubber having a volume resistivity of at least 1×10 9 Ω·cm.