Adhesive compositions and flexible heating device fabricated therewith

A flexible electrically conducting heating device comprising a heat resistor and a pair of electrodes in contact with and adhered to the surface of the resistor by a cured electrically conductive composition, said conductive composition is obtained from a mixture which consists essentially of (a) a vinyl containing organopolysiloxane having the formula

• R.sub.2 (CH.sub.2 =CH)SiO (R'.sub.2 SiO).sub.n Si R.sub.2 (CH=CH.sub.2)
• wherein R is selected from the group consisting of methyl and phenyl radicals, R' is selected from the group consisting of methyl, vinyl and phenyl radicals, n is a number sufficient to provide an organopolysiloxane having a viscosity of at least 100,000 cP at 25.degree. C, in which 0.1 to 1 mol percent of the diorganopolysiloxane units are vinylmethylsiloxanes and at least 90 percent of the remaining organic radicals consist of methyl radicals, and some or all of the terminal CH=CH.sub.2 groups may be R groups, (b) an organopolysiloxane containing at least three Si-bonded hydrogen atoms in which the Si-bonded hydrogen atoms are present in an amount of from 0.01 to 1.7 weight percent, (c) a catalyst which promotes the addition of Si-bonded hydrogen atoms to the vinyl groups, and (d) an electrically conductive material.