Abstract

The factors to be considered in the selection of a test for the assessment of the resistance of leathers to perspiration are discussed. Any such test must involve treatment with a synthetic perspiration coupled with a period of exposure to moist heat. Mechanical action is an important factor in wear but it is difficult to incorporate satisfac torily into a test. The synthetic perspiration used should contain the same con stituents as natural perspiration in the same relative proportions and should have the same buffering capacity. The temperature of exposure to moist heat should not exceed 4Oc. A test based on successive extraction with a synthetic perspiration corresponding in composition to a fourfold concentration of natural perspiration at 4Oc is suggested. Damage resulting at each stage can be assessed objectively or by rele vant physical tests. The degree to which the shrinkage temperature is maintained is an indication of potential resistance to more prolonged exposure to moist heat.