Sound insulationin polyester resin expanded high density 60 kg/m3, fireproof class1, with inside a polymer plate EPDM 2 mm having a weight 4 kg/sqm. Exposed surface coated with an aluminum film very smoothshock resistant. Ideal for the isolation of environments, enginecompartments, partition walls, to prevent the transmission of heat,etc..Thickness mm. 20. Sheet mm. 1000 x 1500. Supplied in sheets