Patent ID: 8889754

Claim:
A cellular polyurethane foam composition for forming a cellular ceramic under fire conditions, the composition comprising: at least 40% by weight based on the total weight of the composition of a polyurethane; from 15% to 40% by weight based on the total weight of the composition of silicate mineral filler; from 5% to 20% by weight based on the total weight of the composition of at least one inorganic phosphate that forms a liquid phase at a temperature of no more than 800° C.; from 1% to 5% by weight based on the total weight of the composition of heat expandable graphite; and wherein the total proportion of inorganic components constitutes in the range of from 20% to 60% by weight of the total composition and the density of the polyurethane foam is in the range of from 150 to 500 kilograms per cubic meter.