The Foam Core Spiral Duct Insulation consists of two highly reflective layers of film (96-percent reflectivity) The inner layer of insulating foam core resists conductive heat flow while a center layer of polyethylene give our product high reliability and strength (nominal thickness 5/16-Inch) The product is an ideal alternative to other types of fibrous insulation products for attics, crawl spaces, metal building, garage doors. etc Ease of handling and quick installation make our Duct Insulation the first choice for insulating round or rectangular ductwork A thermal benefit of R-8 is gained when installed directly to the duct Measures 48inch x 100ft Made in the USA Product: Foam Core laminated between two layers of highly reflective radiant barrier foil. Contact Temperature Range: -60F To 180F (-51C To 82C) Water Vapor Transmission: .02 Perms**** Puncture Resistance: 60 Lbs. Per In.*** Pliability: No Cracking Linear Shrinkage: None Mold And Mildew: No Growth Flame Spread: 0 Astm E84-08 Smoke Development: 40 Astm E84-08 Fire Rating: Class A / Class 1 Reflectivity: 95% Motor Vehicle Safety Standard 302: Zero Surface Burn Rate Emittance: 0.04**** Benefits: 100% Made in USA Only Energy Star Rated Foam Core Reflective Insulation on the planet!!! Blocks radiant heat by up to 95% Reduces Heating and cooling loss Foam Core Sound Reduction Technology Saves you Energy and Money Easy to use and install Requires no protective clothing or special tools Requires no maintenance Highly Durable, Lasts Longer Meets new ASTM Fire codes Additional Details ------------------------------ Product description: The Foam Core Spiral Duct Insulation consists of two highly reflective layers of film (96-percent reflectivity) The inner layer of insulating foam core resists conductive heat flow while a center layer of polyethylene give our product high reliability and strength (nominal thickness 5/16-Inch) The product is an ideal alternative to other types of fibrous insulation products for attics, crawl spaces, metal building, garage doors. etc Ease of handling and quick installation make our Duct Insulation the first choice for insulating round or rectangular ductwork A thermal benefit of R-8 is gained when installed directly to the duct Measures 48inch x 100ft Made in the USA Product: Foam Core laminated between two layers of highly reflective radiant barrier foil. Contact Temperature Range: -60F To 180F (-51C To 82C) Water Vapor Transmission: .02 Perms**** Puncture Resistance: 60 Lbs. Per In.*** Pliability: No Cracking Linear Shrinkage: None Mold And Mildew: No Growth Flame Spread: 0 Astm E84-08 Smoke Development: 40 Astm E84-08 Fire Rating: Class A / Class 1 Reflectivity: 95% Motor Vehicle Safety Standard 302: Zero Surface Burn Rate Emittance: 0.04**** Benefits: 100% Made in USA Only Energy Star Rated Foam Core Reflective Insulation on the planet!!! Blocks radiant heat by up to 95% Reduces Heating and cooling loss Foam Core Sound Reduction Technology Saves you Energy and Money Easy to use and install Requires no protective clothing or special tools Requires no maintenance Highly Durable, Lasts Longer Meets new ASTM Fire codes