... seam areas to form a reliable seamless waterproof layer.Standards(ASTM D6878) Typical properties Have three type : type I: ... break,%≥2503Rate of change of heat treatment size,%≤1.04Brittleness point, max, °C -40°CNo crack5Impermeability0.3MPa,2h ... break, min, %≥15ASTM D751Tearing strength,min, N≥245ASTM D751Brittleness point, max, °C≤-40ASTM D2137Ozone resistanceno cracksASTM D1149Properties after heat ...