No defects such as: no color change,uneven surface,wrinkle,crackle ,filth,abnormal luster. AppearanceNo defects such as: no color change,uneven surface,wrinkle,crackle ,filth,abnormal luster.Width mm1260+201300+20Thicknessmm2.0±0.5 Unit volume g/m2180±20Fire resistancemm/minCombustible,but speed is less than 100mm/min.