SRI – Solar Reflective Index
Combined value of emittance and reflectivity
Initial Weathered 3 Years
Energy Star Required 0.65 0.50
Soprastar Reflectivity 0.78 0.73
Soprastar Thermal Emittance 0.89 0.70
Soprastar has the ability to hold the reflectance value for up to 10
Years based on ASTM D4799, Cycle A Testing.
Competitive products using acrylic coatings or resin flakes tested at 0.51 reflectivity for acrylic coatings and 0.50 for resin flakes from an initial reflectivity of 0.80 and 0.66 respectively.
Result: Soprastar will hold its initial high reflectance for over 10 years and maintain a higher reflective value than many other cool roof products.