General rules and recommendations for the optimisation of leather manufacture

The material properties may not be modified through storage, transport and proces-sing. The following overview contains the most important recommendations for the optimisation of leather manufacture with regard to the avoidance of chromium (VI) in leather and leather products.

  1. Carefully degrease the raw hides
  2. Avoid or reduce the quantity of bleaching agent used prior to the tanning process; never use bleach after the tanning process
  3. Use chromium (VI)-free tanning agents and chemicals
  4. Neutralise down to the lowest-possible pH value; avoid pH peaks during neutralization
  5. Preserve wet blue sufficiently with biocides approved for the purpose
  6. Use 1 – 3 % vegetable tanning agents; they will provide additional protection against oxidation
  7. Replace polyunsaturated fatliquors with oxidation-resistant fatliquors
  8. Do not use pigments containing chromium
  9. Avoid ammonia or other chemicals containing ammonia when neutralising, and when purging or dyeing; use dispersing syntans instead.
  10. End the wet finishing at low pH values (pH 3.5 – 4)
  11. Conduct an additional washing process
  12. Avoid the formation of mould over the entire process
  13. Check the leather after prolonged storage for chromium (VI) pollution

Please contact us for more information on the safety and quality of leather products.

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