Item

Unit

Inspection Method

Data

Tolerance

Grammage

g/m²

GB/T451.2

50

52

54

56

58

60

62

64

70

80

±3%

Bulkiness

cm³/g

GB/T451

0.88

0.88

0.88

0.88

0.88

0.88

0.88

0.88

0.88

0.88

±4%

Smoothness

s

GB/T451

900

900

900

900

900

900

900

900

900

900

±300

Glossiness

%

GB/T8941.3

43

43

43

43

43

43

43

43

43

43

±8

Brightness

%ISO

GB/T7974

84

84

84

84

84

84

84

84

84

84

±2

Opacity

%

GB/T1543

87

87

87

88.5

89.5

91

91.5

92.5

94

96

±2

Moisture

%

GB/T462

5

5

5

5

5

5

5

5

5

5

±1.5