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Dow XIAMETER™ RTV-4136-M Silicone Rubber Curing Agent for use with XIAMETER™ RTV Base Rubber products. SILASTIC™ M RTV is a two component, silicone rubber that cures to be firm and flexible; it has high inhibition resistance, good cut growth resistance and low shrinkage. Curing agent only. 20.4 kg Pail.