The silicone foam is a two-part type of silicone RTV. It has the features of excellent fireproof, flood-sealing, and ventilation-sealing.
It is designed to set up fire walls and fireproof zones in case of fire break. The rapid blocking of fire spread and toxic gases is critical to save lives and lessen damages.
Mixing part A and part B at the same ratio of 1:1 makes a sticky liquid. It would be two or three times as big as the original mixture when it is blown and cured and become a closed-cell foam.