Patent ID: 8772366

Claim:
A composition for forming, when foamed and cured, a phenolic foam product with a pH of 5 or more, a closed cell content of 90% or more, and an aged thermal conductivity of 0.025 W/m·K or less when measured at a mean temperature of 10° C. after heat aging for 175±5 days at 70±2° C. in accordance with the procedure specified in European Standard EN13166: 2001, Annex C, Section C.4.2.3, the composition comprising: a phenolic resin, a blowing agent, an acid curing catalyst to initiate polymerization of the phenolic resin, an inorganic filler, a plasticiser and an organic modifier for co-reacting with the phenolic resin; wherein the blowing agent comprises isopropyl chloride and at least one hydrocarbon of butane, pentane, hexane and their isomers in a weight ratio of from 60:40 to 95:5; the inorganic filler consists of a metal hydroxide or metal carbonate with an ionic equilibrium solubility (Ksp) less than 10 −8 when measured at 25° C.; and the plasticiser has a molecular structure containing both an ester backbone and a hydroxyl group.