... and improve it for raising the production efficiency.colour wool felt techique use:1.used in mechanism, ... ,heatpoof,sound insulation,silencing4.fire retardant,insulation5.filtration:air,petroleum,water6.polishing:marble,crystal,glass,jadeware,furniture, ... ,heatpoof,sound insulation,silencing4.fire retardant,insulation5.filtration:air,petroleum,water6.polishing:marble,crystal,glass,jadeware,furniture, ...