WHAT IS OXIDIZED BITUMEN (BLOWN ASPHALT)? Oxidized Bitumen (Blown Asphalt) is a form of bitumen that has undergone oxidation, resulting in a material that is harder and more viscous. This procedure includes exposing bitumen to high-temperature air, which causes it to shed some of its volatile components and become more resistant to temperature fluctuations.For roofing … Continue reading OXIDIZED BITUMEN (BLOWN ASPHALT)