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Chrome Tanning Agent / Basic Chromium Sulphate
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CAS No. |
12336-95-7 |
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MF |
Cr(OH)SO4 |
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EINECS No. |
235-595-8 |
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Place of Origin |
Russian Federation |
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Grade Standard |
Industrial Grade |
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Purity |
25% min |
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Appearance |
bright green powder |
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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.
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:
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ITEM |
Grade A |
Grade B |
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Chrome in Cr2O3 equivalent, w/w %, not less |
25 |
25 |
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Basic capacity, %, within limits |
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High |
30-36 |
30-36 |
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Low |
37-42 |
37-42 |
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Fe (%) |
0.04 max |
0.08 max |
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Water-insoluble components, w/w %, not more |
0.1 max |
0.4 max |
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Solubility in water at 20 - 25 °C, %, not less |
99 |
97 |
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pH of product solution with 2% w/w |
3,0 |
3,0 |
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Packing: in 25kg kraft paper multilayer bag with polyethylene liner | ||