It is made of asbestos-free, E-glass fiber filament yarns, and then passes through an oven with high temperature in order to burn off the sizing and other organic elements in the cloth. After this heat treatment, fiberglass cloth will change to brown color and it will be smoke-free during the application. It could be used for all types of thermal insulation and heat protectione, specially for the application where smoke is not allowed. also the basic cloth for finish treament in order to meet special applications.