Process

%

Chemical

^oC

Time(min)

PH

Comments

Washing

200

Water

40

0.3

Rockol  642

0.2

Formic acid

20

         Drain

100

Water

35

     Retannage I

3

Chrome (26/33)

2

Rockytan RHN

60

1.5

Rockytan DC

30

0.7

Sodium formate

30

4.3

         Drain

150

Water

35

Neutralization

1.5

Sodium formate

30

0.6

Sodium bicarbonate

3×15

5.2

Check Ø with B.C.G

         Drain

Washing

300

Water

35

5

80

Water

35

      Retannage II

3

Rockytan RE-540

30

5

Rockytan RR7

30

2

Rockytan RD

30

3

Chest nut extract

2

Rockytan ROS

2.5

Dye

60

Check Ø penetration

0.3

Formic acid

30

4.5

         Drain

100

Water

50

      Fatliquoring

3

Rockol LNP-375

3

Rockol OPS-322

2.5

Rockol LNE-918

1.5

Rockol OFL

60

0.5

Formic acid

2× 15

1

Rockytan ROS

20

0.5

Formic acid

2× 15

3.7

         Drain

Washing

200

Water

20

5