ASTM D4576-16 Standard Test Method for Mold Growth Resistance of Wet Blue and Wet White

The ASTM D4576-16 standard published by the American Testing and Materials Organization (ASTM) describes the properties of mildew resistance and test methods in leather textiles of wet blue and wet white. The full name of this standard is as follows: ASTM D4576-16 Standard test method for mold growth resistance of wet blue and wet white.

It is divided into two basic types: wet blue or wet white leather, vegetable tanning and tanning. Substances used to transform raw hides are of vegetable origin. The active ingredient responsible for the tanning process is tannin, which is concentrated in some plants. The intermediate product resulting from this process is a pre-tanned material called wet white leather. In recent years, chrome tanning has made saving of vegetable tanning products simpler and in a shorter time. In addition, chromium salts form a more stable bond with the skin than the tanning processes ever known. At the end of the tanning process, the skins turn to a light blue color and react which must be partially neutralized before starting the dyeing and fattening process called wet blue skin.

The test method presented in the ASTM D4576-16 standard is a test method to evaluate the resistance properties of wet blue and wet white to mold growth. This test result helps to estimate the storage time before molding takes place.

With this test, the degree of correlation between commercial wet blue and wet white quantities in storage or shipping situations, or in both cases, is not fully determined.

Briefly, this test method involves determining the mold growth resistance of wet blue and wet white leather depending on the storage and transportation requirements and for use in leather production.

Within the framework of laboratory test services, ASTM D4576-16 provides standard test services for mold growth resistance of wet blue and wet white by our organization.