Yes, it is. Bluewind Vermiculite Insulating Firebrick does provide the best option for insulating firebricks used in furnaces in industries. Its composition which has non asbestos expanded silver vermiculite provides maximum pore structure control thereby ensuring maximum insulation efficiency. The high temperature sintering of this brick makes it also very strong and exposes it to a wider range of industrial uses in steel, glass and ceramics industries. It is an energy saving insulating material and also environmentally friendly and it aids industries in operating efficiently while minimizing pollution.