1. sound proof insulation for car 2.High purity of butyl rubber & high-quality aluminum foil 2.Water proof, sound absorbing, sound proof ... in railroad cars, buses, automobiles, and ships. It is also used for building construction, electronic industry, machinery, steel furniture, home appliances ... -free solvent. Remove all dust, dirt, oil, moisture etc.2.Use scissors, knife or die to cut the mat to ...