Item  copy paper

Unit

Data

brightness 

%

102-104%

substance

g/m2

80±2

thickness

MM

≥110

thickness difference

MM

≤0.02

opacity

%

≥95

whiteness

%

≥145

COBB 60 S 

g/m2

230+/-100ML

Breaking  length average 

MM

≥400

smoothness front side 

S

22-25

            back side 

17-22

smoothness variation  

%

≤20

tensile strength MD

N

≥46

                 CD

≥28

Ash

%

9_15

Moisture content 

%

4.5-6.5

shrinking variation CD

%

≤+2.5

Rigidity MD

MN

80-90

         CD

30-40