... thermal insulation, Sound insulation Anti-aging High impact resistance Good waterproof Easy to clean10. Corrosion resistance11 ... qualityTest itemsStandardTest itemsStandardHardness,HRR≥85Veka softening point,≥83Tensile strength,MPa≥37Status after heatingNo bubbles, cracks. SmoothElongation ... change rate,%±0.2Charpy impact strength,kJ/sq.m. 23±2-10±1Weather resistantCharpy impact strength,kJ/sq.m. ...