HP Fire Armor Sleeve - Thermal Sleeving by Heatshield Products: HP Fire Armor Sleeve is perfect for protecting your components in extreme situations. Fire Armor Sleeving has a rugged silicone covering that makes it resistant to fraying and chemicals. Under the silicone covering is a thermal barrier that results in heat protection against temperatures of up to 450 degrees of continuous heat and up to 700 degrees of intermittent heat. The part number for this HP Fire Armor Sleeve Heat Shielding Sleeve is 210040 and it has a 3/8 inch diameter. It is 3 Feet long and can be easily cut to desired length(s).