Glass fiber insulation cotton (needle felt) is a kind of felt nonwovens made of glass fiber as raw material, which cuts the fiber into short threads of two to three inches per share, and the combed glass fiber is needled to make the fibers entangled with each other. Glass fiber needle felt has the characteristics of low thermal conductivity, good sound absorption, long fiber, high tensile performance, non-toxic and harmless, odorless and so on. Sailong glass fiber needle felt has developed and produced a special base material for aerogel felt.