Item  copy paper

Unit

Data

brightness 

%

******4%

substance

g/m2

*0±2

thickness

MM

≥**0

thickness difference

MM

≤0.*2

opacity

%

≥*5

whiteness

%

≥**5

COBB *0 S 

g/m2

**0+/***0ML

Breaking  length average 

MM

≥**0

smoothness front side 

S

****5

            back side 

****2

smoothness variation  

%

≤*0

tensile strength MD

N

≥*6

                 CD

≥*8

Ash

%

9_*5

Moisture content 

%

4.**6.5

shrinking variation CD

%

≤*2.5

Rigidity MD

MN

****0

         CD

****0