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ISO (International Standard Organization) 15115:2019 is the standard for leather terminologies and definitions.
hide or skin with its original fibrous structure more or less intact, tanned to be imputrescible, where the hair or wool may or may not have been removed, whether or not hide or skin has been split into layers or segmented either before or after tanning (3.97) and where any surface layer, however applied, is not thicker than 0.15 mm
full grain leather leather having kept its entire grain , with none of the surface removed by any corrective mechanical treatment.
raw skin of a mature or fully-grown animal of the larger kind.
hide or skin converted to leather either by treatment solely with chromium salts or with chromium salts together with a small amount of some other tanning agent, used merely to assist the chromium tanning process, and not in sufficient amount to alter the essential chromium tanned character of the leather
hide or skin converted to leather by a tanning agent free of chromium salts, where the total content of chromium in the tanned leather is less than or equal to 0,1% (mass of chromium/total dry weight of leather)
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