1 Substanceg/m280±2.52Substance variation CDg/m2≤43.Thicknessum106-1124Thickness difference CD%≤105Brightness%102-1046Opacity%≥917Breaking length Averagem≥32008SmoothnessAverage of two sidesS20-25Variation of two sides%≤309Surface absorbing weightg/m2≤3010Shrinking Variation CD%≤±2.811Folding endrance CDtimes≥1512Dirt (0.2-1.5 mm2)Point/m2≤65>1.5 mm2013Moisture content%4.5-6.014Ash%≤16.015Sizingmm≥0.75mm