| http://www.w3.org/ns/prov#value | - (R1R22SiO1/2)w(R22SiO2/2)x(R2SiO3/2)y(SiO4/2)z wherein R1 is a C1 to C10 hydrocarbyl group or a C1 to C10 halogen-substituted hydrocarbyl group, both free of aliphatic unsaturation, R2 is R1 or an alkenyl group, w is from 0 to 0.9, x is from 0 to 0.9, y is from 0 to 0.99, z is from 0 to 0.85, w+x+y+z=1, y+z/(w+x+y+z) is from 0.1 to 0.99, and w+x/(w+x+y+z) is from 0.01 to 0.9, provided said silicon
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