abstract |
A composition of lower alkenyl-containing organopolysiloxane, an organohydrogenpolysiloxane, and a platinum catalyst in which the refractive index of the alkenyl organopolysiloxane is 1.45 to 1.48 and the elastic modulus in compression is from 1.0 x 10- 4 to 3.0 x 10 -1 kg/mm 2 at 25°C after curing is a refractive-index-coupler for optical communications fiber joints. |