is specially designed for high intensity, low frequency noise that is typical of diesel engines in marine and industrial environments. No 662 consists of a filled vinyl layer with acoustical foam attached, for a total weight of 1.5 lbs/sq. ft. the high density of this product results in the maximum sound transmission loss available for a thin (3/8") flexible material. No 662 can be used to line all types of enclosures, ductwork, doors or machinery shrouds. Excellent as a heavy duty carpeting underlayment. Standard color is gray, which can be painted (acrylic latex only) to match surrounding decor. Standard size is 3/8" x 52" x 60' roll or cut to length. No. 662 carries flame ratings of UL #94 SE1 and Fed Spec. 191, Method 5903, on the foam and barrier components. the filled vinyl resists water or oil and withstands temperatures up to 200 degrees F.