Fire retardant brick produced from a foamed intumescent composition base on polyurethane has a structure of a perforated brick with through-holes connecting two opposite sides

摘要

Fire-retardant brick produced from a foamed intumescent composition base on polyurethane has a structure of a perforated brick with through-holes connecting two opposite sides. The outer walls and optionally webs remaining in the inside consist of the foamed intumescent composition.