Two-part fast curing RTV silicone for formed-on-part automotive gasket

A fast curing two-part RTV silicone formulation comprising:

• a silanol terminated polyorganosiloxane;
• at least 5% by weight of the formulation of a tri- or tetra- methoxy or enoxy functional silane crosslinker;
• water;
• and,
• a condensation catalyst selected from the group consisting of stannous carboxylate compounds, dimethyl tin (IV) compounds and mixtures thereof, the water being present in a first of said two parts and said first part further comprising said silanol terminated polyorganosiloxane and the second of said two parts being free of water and comprising said crosslinker component, said condensation catalyst and a tri-methylsilyl terminated polyorganosiloxane,
• the composition further comprising one or more fillers, and
• the stoichiometry of the formulation is adjusted to provide a mix ratio of the two parts of 2:1-1:1.

A fast curing two-part RTV silicone formulation,

• the first part comprising a silanol terminated polyorganosiloxane having a viscosity in the range of about 1000 cst to 50,000 cst;
• water;
• and a filler, and
• the second part comprising at least 5% by weight of the total formulation of a tri- or tetra- methoxy or enoxy functional silane crosslinker;
• an effective amount of a condensation catalyst selected from the group consisting of stannous carboxylate compounds, dimethyl tin (IV) compounds and mixtures thereof;
• and a tri-methylsilyl terminated polyorganosiloxane having a viscosity in the range of about 100 cst to about 10,000 cst.