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Auto sound insulation materials: This car soundproofing special material for hood and other parts are made of multi-fiber cotton + aluminum foil. In response to the high temperature of the engine compartment, this soundproofing material can provide a layer of protection for the hood paint surface and prevent the heat reflection of the engine. Protect the various wires in the engine compartment from high temperature baking, avoid premature aging, and even affect service life and driving safety. Thickness:10mm Recommended Install Temperature: -10℃ ~ +60℃ Resistance Temperature Range: -40℃ ~ +149℃ Applications:Such as the door, the roof, the window, the bottom plate, the rear tail box, the hood and other parts that are prone to car noise. Package Included:1 Sheet(not one roll) Function: Low air permeability and good air tightness Excellent thermal invariance Features superior receiving vibration and impact energy Lower temperature and better elasticity High ozone resistance and weather resistance High chemical invariance Electrical insulation and corona resistance are better than shallow rubber The water penetration rate is extremely low, and the water absorption rate at normal temperature is lower than other rubbers. Use high-viscosity adhesive to ensure that the material and the sheet metal are tightly bonded, and the viscosity is not weakened by environmental changes; after strict environmental testing, the materials you use are healthy and safe. The engine compartment is constantly hot and there is no need to worry about the production of harmful substances.