Double A4 Copy Paper 80gsm a4 paper

Quality(The proportion of wood pulp)

Imported wood pulp 70%
Domestic wood pulp 30%

Whiteness (%) is greater than

102-104

Coefficient of Opacity (%) is greater than

90

Opacity (%) is greater than

recto25

wire side20

recto and wire side deviation is less than(s)

30

size resistance(mm)is greater than

0.75

Ash content(%)

16---18

Moisture content(%)

4.5---5.5

Density (g/cm3) less than the

0.75

Surface strength (m / s) is greater than

1.0

Dust degree (a / m2) is less than

(0.2—1.5)mm2 50

greater than1.5mm20

Substance(gsm)

70/75/80

substance deviation is less than(g)

2.5

thickness(um)

10.0—11.0

thickness deviation is less than (um)

0.5