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Leather is a fibrous protein consisting of collagen in a three dimensionally crosslinked network. Chrome tanning of leather improves the appearance of leather but at the same time emits both solid and liquid chrome leather wastes. Scrap rubber recycling using untreated and neutralized leather fibrous particles in natural rubber has been studied. Vulcanization, mechanical, morphological and swelling properties of the natural rubber -scrap rubber composites containing neutralized leather havedoi:10.1590/s0104-14282005000200008 fatcat:2cc22hjtfrhunhilxm5uyygmi4