The new generation of high silica materials with high thermal resistance was created by the leaching of chopped glass fibre. These materials with low thermal conductivity are inert to the majority of chemical reagents, resistant to organic and mineral acids, weak alkali, water and high pressure stream. High silica chopped strand mats are non woven fabrics designed for using in a wide range of insulation and protection applications at temperature till 1100C. The technology and the quality of the leaching process of initial Si-Al-Na glass widely depends on quality of fibre surface characteristics, i.e. roughness of surface glass filaments. The surface roughness of the fibre before leaching is a function of chemical durability, therefore it depend on content of Al2O3.
