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Cr(OH)SO4 - Chrome Tanning Agent

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Chrome Tanning Agent / Basic Chromium Sulphate
 
CAS No.
12336-95-7
MF
Cr(OH)SO4
EINECS No.
235-595-8
Place of Origin
Russian Federation
Grade Standard
Industrial Grade
Purity
25% min
Appearance
bright green powder
Application
tanning industry, dyeing and printing

Leather has a complicated structure that is used by tanners to derive material suitable for all types of task. Tanning renders the skin stable and rot proof whilst retaining its structure and strength. The process involves several stages; removal of hair and epidermis (the very outer layer) and also of the fatty part of the flesh. The remaining layer is called the corium. The corium is stabilised by one of several methods using animal oils, alum, chrome salts or vegetable tanning.
Chrome tanning involves tumbling skins in drums with chromium salts and other chemicals. It is very quick and the most common method in use today.
SPECIFICATION:

ITEM

Grade A

Grade B

Chrome in Cr2O3 equivalent, w/w %, not less

25

25

Basic capacity, %, within limits

High

30-36

30-36

Low

37-42

37-42

Fe (%)

0.04 max

0.08 max

Water-insoluble components, w/w %, not more

0.1 max

0.4 max

Solubility in water at 20 - 25 °C, %, not less

99

97

pH of product solution with 2% w/w

3,0

3,0

 

Packing: in 25kg kraft paper multilayer bag with polyethylene liner

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