Glass Wool It is mainly used in the shock absorbing, sound deafening or noise reduction treatment in building interiors. Glass Wool Main Sepcifications Product Name: Glasswool Felt Density: 10-48kg/ m3 Thickness: 25-150mm Extant: 1200mm Length: Custom-tailo r Thermal conductivity: 0.033-0.047( W/ MK) Service temperature: -120-400( ° c)