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Feb 09, 2018

Leather is the animal skin that has been denatured and perishable by physical and chemical processing such as hair removal and tanning. Leather is composed of natural protein fibers closely knitted in three-dimensional space, the surface has a special grain surface layer, with the natural grain and luster, feel comfortable.

In the process of human evolution, it was found that some plant juice or mineral oil has a certain tanning of leather, raw skin through the juice soaking, more breathable, anti-corrosion. So that the board has a soft, tear-resistant, anti-tortuosity and other physical and chemical properties. Leather in this period truly possessed the characteristics of leather products. We call this juice tanning agent. Tanning industry to the middle of the last century to form a stable tanning agent can be divided into the following three categories:

1. Vegetable Tanning Agent: The main gum, for industrial leather or leather.

2. Mineral tanning agent: The main chromium salt, aluminum salt, for a variety of civilian leather. Such as clothing.

3. Organic tanning agent: Mainly formaldehyde, glutaraldehyde, etc., for fur and all kinds of miscellaneous skin fur.