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RSiCl${}_3$ introduces branching and, at sufficient conversion and loading, cross-links. hydrolysis gives RSi(OH)${}_3$, with three possible siloxane connections per silicon. Incorporation links chains into a network, suppressing flow and usually increasing stiffness and dimensional retention. A sufficiently connected permanent network behaves as a thermoset or cross-linked elastomer rather than an ordinary flowing linear polymer. A small concentration need not immediately produce a macroscopic gel; conversion and network connectivity matter.