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JKTAN FCBJ4
Bleach tanning agents for vegetable tanned leather

Jktan FCBJ 3 is a synthetic tanning agent for bleaching vegetable tanned or retanned leather to a pale colour.  It is particularly suitable for the bleaching of EI tanned leather. 

Jktan FCBJ 4 is a synthetic tanning agent for bleaching vegetable tanned or retanned leather to a pale colour with a yellowish tinge.  It is particularly suitable for bleaching Sole, Sandal and vegetable-tanned industrial leathers.

Nature

:

 Naphthalene sulphonic acid condensation products.
Specification : Concentration                  80% approx.
pH (1:10)                        1.3 – 1.8
  : Jktan FCBJ 3 produces a neutral pale leather colour while FCBJ 4 gives a pronounced yellowish tinge.  They bleach the colour of the leather very evenly and do not impair resistance to cracking of the grain when they are applied in the proper way.
Properties : Jktan FCBJ types are bleach tanning agents in powder form.  They are readily soluble in water.  They are also soluble in vegetable tan liquors to a greater or lesser extent, depending on the concentration of the later.

Jktan FCBJ 3 produces a neutral pale leather colour, while FCBJ 4 gives a pronounced yellowish tinge.  They bleach the colour of the leather very evenly and do not impair resistance to cracking of the grain when they are applied in the proper way.

Jktan FCBJ types are stable to iron and do not gives to discolouration.  Iron stains formed on vegetable tanned or retanned leather can be removed with FCBJ types.
Application : Jktan FCBJ types can be used as bleach tanning agents for all types of vegetable tanned or retanned leather.  However, Jktan FCBJ3 is mostly preferred for bleaching EI leather while FCBJ4 is preferred for bleaching heavy leathers like Factory Sole leather, industrial leathers etc.  Depending on the conditions given bleaching can be effected in the drum or by dipping process or on the table.
Drum Bleaching : Light and medium weight leathers are drummed with 3-5% of Jktan FCBJ type and 100-150% of float at30oC until the desired bleach effect is attained followed by rinsing for five minutes in running water.

Factory sole leathers, which are to be retanned with extracts filling agents, are drummed until the extracts has been taken up completely penetration being promoted by introducing hot air.
DIP Bleaching : This is carried out in plastic tubs containing solutions of 70-100g. of the Jktan FCBJ type per litre of water.  The bleaching solution may be heated to 35-40oC.  The leathers to be bleached are immersed for a short period in the solution, given a short rinse, if required.  The bleaching solution can be used several times and can finally be added to other tan liquors.
Bleaching on Tables : Solutions containing 50 gm of Jktan FCBJ type per litre of water at 35oC are used for bleaching on tables.
Safety : We know of no ill effects that could have resulted from using the Jktan FCBJ types for the purpose for which they are intended and from processing them in accordance with current practice.
Storage Stability : Although storage life is unlimited, particular care should be taken to ensure that the product is stored dry, and bags are tightly closed.
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