Improvement for two-component intumescent flame retardant

摘要

An improved flame retarded polyolefin is disclosed which comprises a combination of ammonium polyphosphate ; tris(2-hydroxyethyl) isocyanurate; and a selected silica in an amount from .5 percent to an amount equal to one-half the amount by weight of THEIC, wherein the silica meets defined surface area, particle size and absorption criteria.