Abstract: There is provided a two-part moisture cure organopolysiloxane composition comprising a base part and a catalyst package part. The catalyst package part, despite comprising amino silane(s), alkoxy silane(s), tin catalyst(s) and optionally reinforcing filler(s) and/or extending filler(s) in a carrier fluid, undergoes minimal phase separation during storage. This is achieved by utilizing one or more polyarylorganosiloxane polymers or silicone copolymers thereof as the carrier fluid, enabling the catalyst package part to be stored and function as a shelf stable continuous phase.

Abstract: A two-part moisture cure organopolysiloxane composition comprising a base part and a catalyst package part is provided. The catalyst package part undergoes minimal phase separation during storage despite comprising amino silane(s), alkoxy silane(s), and tin catalyst(s) and optionally reinforcing filler(s) and/or extending filler(s). This is given by the utilization of one or more linear or branched polyethers as a carrier fluid thereby enabling the catalyst package part to function as a shelf stable continuous phase.

Abstract: A two-part moisture cure organopolysiloxane composition comprising a base part and a catalyst package part is provided. The catalyst package part, despite comprising amino silane(s), alkoxy silane(s), and tin catalyst(s) and optionally reinforcing filler(s) and/or extending filler(s) in a carrier fluid, undergoes minimal phase separation during storage. This is achieved by utilizing silicon-free linear or branched polyethers comprising repeating units having the average formula (—CnH2n—O—)y wherein n is an integer from 3 to 6 inclusive and y is at least four, comprising one or more —OH terminal groups, —OR10 terminal groups or —OH and —OR10 terminal groups where R10 is an optionally functionalised hydrocarbon group having from 1 to 12 carbons; as the carrier fluid, enabling the catalyst package part to function as a shelf stable continuous phase.