For the person that wants the best! US Energy Products radiant barrier is the thickest and strongest Radiant Barrier product on the market. Use in the same applications as our well known NASATECH when a little extra strength and rigidity are desired. The increased strength of this material makes it the easiest to install. Available in 500 and 1,000 sq. ft. rolls or custom lengths beyond. Comes in perforated 4 widths. NASATECH Heavy Duty is a construction / industrial grade Radiant Barrier reflective insulation. Key Benefits Thickest and strongest radiant barrier product on the market. Allows for easier and quicker installation. Product Specifications Meets ASTM C1313 Standard Specifications for Sheet Radiant Barriers for Building Construction Applications Product Description Two-sided reflecting metalized film with polyethylene woven reinforcement Weight 32 lbs per 1000 sq ft roll Tensile/Tear Strength Length: 21.49 pounds force Width: 24.56 pounds force ASTM D2261 Pliability 70°F±5°F & 50±5% Relative Humidity ? No Cracking or Delamination ASTM C1313-05 Adhesive Performance 180°F±5°F & 50% Relative Humidity ? No Bleeding or Delamination ASTM C1313-05 Flame Spread & Smoke Class A/ Class 1 0 Flame Spread, 5 Smoke Development ASTM Method E84-10 Resistance to Fungi PASS ? No Growth ASTM C1338-08 Permiability 5.88 Perms ASTM E96-05 Thermal Properties EMISSIVITY: 0.05 REFLECTIVITY: 95% ASTM C1371-04a