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Location :: Products -> Leather Tanning
-> Anchrome |
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ANCHROME
Chemical Character : Basic Chromium Sulphate |
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PROPERTIES
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ANCHROME is a powder
easily soluble in cold water and highly soluble in hotwater in the
proportion of 1 : 2.
It contains compatible additives to help fast penetration and
better exhaustion.
The product is made in such a way as to ensure a high degree of
solubility in cold water.
The tanner has the obvious advantage of controlling his masking by
the addition of suitable masking agents. The basicity variation
from batch to batch is very minimal and one can be assured of a
starting material of standard basicity. |
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APPLICATION
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Because of the ease of solubility,
this can be used in dry tannage or floatless tannage without any
problem. The product could also be dissolved in water in the
proportion of 1 : 2 and used for tannages where definite floats are
employed. Since they are not masked, the tanner can add the requisite
amount of masking agent which has the advantage of controlled and
uniform dyeing at the later stage. As such, when used, it gives an
optimum bluish green colour and uniform tanning is achieved. |
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ANALYTICAL DATA |
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Cr2O3 |
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24 + 0.5% |
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Basicity |
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33 + 1% |
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Neutral Salts |
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28 + 1% |
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pH of 6% Solution |
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3.0 + 0.2 |
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METHOD OF TANNAGE
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DRY TANNAGE |
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Starting Material |
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Pickled pelt |
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Dry Drum |
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10-12% anchrome |
1
hr |
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Flood |
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60% Water |
1
hr |
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Basify |
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1.5-2% Basifying agent in 20% water.
(added in 3 feeds at intervals of 15 mts.
run for 1/2 hr. after last addition) |
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Final pH |
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3.8 - 4.0 |
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LIQUOR TANNAGE |
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60% Water - 3% Salt |
15 mts |
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10-12% ANCHROME in 20-30% Water (added in three feeds at 30 mts. intervals; run for finally 1 hr.) |
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1.5-2% Basifying Salt in 20% Water (added in 3 feeds at
15 mts. intervals;
run for 1/2 hr. after last addition) |
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Final pH |
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3.8 - 4.0 |
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NOTE |
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1. It
is better to add 0.1 - 0.2% of preservative at the end of Chrome
Tanning, when storage is contemplated.
2.
The powder should be kept well packed without exposure to air as it is
highly hygroscopic. |
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PACKING |
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Available in 25/50 kgs. Packings
Packed in Kraft Paper Bags / HDPE Woven bags with an additional inner
polythene liner. |
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(The above procedure
outlined is for guidance only and is without obligation) |
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