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Norm

1st sort

2nd sort

a) mass-method

for 25, 35 - 97,7
for other - 98,0

97,5

б) photometric method

для марок 25, 35 - 97,7
для других - 98,0

97,5

the degree of moisture-absorbing, g min 

140

130

water content, % max

10,0

ash content, % max

0,2

0,3

contents of the things that don't dissolve in sulphuric acid , % max

0,30

0,50

dust content, % max

0,2

Whiteness, % min

85

-

Fe, mg/kg of waterless cellulose, max

-

the viscosity mPa sec for marks

15

1,0-2,0 (10-20)

25

2,1-3,0 (21-30)

35

3,1-4,5 (31-45)

70

4,6-8,5 (46-85)

100

8,6-11,5 (86-115)

150

11,6-17,5 (116-175)

250

17,6-30,0 (176-300)

350

30,1-43,0 (301-430)

650

43,1-85,0 (431-850)