One-part organopolysiloxane gel composition

A one-part organopolysiloxane gel composition comprising:

• (A) 100 parts by weight of an organopolysiloxane consisting of from 80.0 to 97.0 mol % of R(CH3)SiO units, from 1.0 to 10.0 mol % of RSiO1.5 units, from 0.1 to 4.0 mol % of (CH3)2(CH2═CH)SiO0.5 units, and from 0.5 to 10 mol % of (CH3)3SiO0.5 units [wherein, a total of said units is 100 mol %, and in each unit formula representing said units, R represents a methyl group, a phenyl group, or a group represented by a formula RfCH2CH2— (wherein Rf is a perfluoroalkyl group that contains or does not contain an ether linkage-forming oxygen atom within a chain)], in which a plurality of said R groups within a single molecule are either identical or different;
• (B) an organohydrogenpolysiloxane having at least two units represented by a formula H(R1)2SiO0.5 within each molecule [wherein, each R1 represents, independently, an unsubstituted or substituted monovalent hydrocarbon group other than an alkenyl group],
• in sufficient quantity that a number of hydrogen atoms bonded to silicon atoms within this component is within a range from 0.5 to 4.0 atoms for each vinyl group within said organopolysiloxane of said component (A);
• (C) an effective quantity of a platinum based catalyst;
• (D) a phosphite triester in sufficient quantity to provide at least 2 equivalents relative to platinum metal atoms within said component (C);
• and
• (E) an organic peroxide in sufficient quantity to provide at least 2 equivalents relative to said component (D).