Fiberglass needled mat is a filter material which has a reasonable structure and can bear high temperature. It not only has the excellent merit such as heat-isolation, anti-corrosion, stable-size, minimum elongated shrinkage, high intensity; but also the textile fiber of mat layer assumes the single textile fiber, three dimensional pore structure, the hole rate is high, filtering the resistance to the air small, is a kind of high speed and high effective of heat filter material. Density： 100 kg/m3 -200 kg/m3