Pipe Insulation, Length 4 ft., Wall Thickness 1, Temp. Range -40° to 350°F, Material Melamine Foam and Standards ASTM C1410 Cellular Melamine, ASTM E84 25/50 Rating; Varies by Insulation Type, Insulation Nominal I.D., For Tube I.D., For Tube O.D., For Iron Pipe Size and Color.