Carrara ArmourCool HD Reflective Cap Sheet is constructed with a tough composite reinforcement of non-woven polyester strengthened with a glass fiber scrim in both machine and cross directions, which is coated with select SBS polymers and premium asphalt. Specially formulated for excellent fire resistance, this membrane has highly reflective mineral granules (82 SRI) embedded in the top surface to provide protection against ultraviolet radiation, while the underside is covered with a thin micro-perforated film, which disappears upon heat welding. Carrara ArmourCool HD utilizes the benefits of a Titanium Dioxide (TiO2) compound which is applied onto the surface of the product. In combination with sunlight, this Air Care Technology (ACT) treatment is proven to act as a catalyst to convert Nitrogen Oxide (NOx) compounds into harmless nitrates. This cap sheet can be used as the top ply in either a BUR or modified bitumen roof system where requirements call for diminished heat gain and emittance and reduced Nitrogen Oxide (NOx).