What technical requirements define self adhering polymer modified bitumen roofing underlayment for asphalt or bitumen modification?

Self-adhering polymer modified bitumen roofing underlayment must meet several technical requirements. It should have a minimum thickness of 1.5 mm, exhibit excellent adhesion to various substrates, and possess a high resistance to UV radiation and temperature fluctuations. The material should also demonstrate flexibility at low temperatures and maintain tensile strength and elongation properties. Additionally, it must comply with relevant ASTM standards, ensuring durability and performance in protecting against water infiltration and environmental stressors.