Inorganic retanning compound.
CORETAN ST is a retanning product used for articles that require fibres to be compact and the skin to be firm.
It is, therefore, excellent for the production of splits that are to be polyurethane finished, as well as printed and fatliquored splits for the production of mountain and leisure footwear. Its use impairs waterproofing, but has no effect on the softness of the leathers produced.
The recommended amount varies from 2 % to 5 % in accordance with the article required and with the material available.