... ,eco-friendly. high quality soundproof and heat insulation material. insulation board 1. material is compressed cork grains with nontoxic glue which ... of natural cork,can meet special need such as soundproof,waterproof,heat insulation function,this kinds insulating material is distinctive from ... -250kg/m3. 3. Packing: export carton,loading quantity depends on board thickness. insulation cork ...