Yellowing resistance test

Leather and rubber products will experience varying degrees of aging during long-term use, and yellowing is one of the indicators of aging. Polyurethane (PU) materials in footwear materials, thermoplastic rubber (TPR) materials without ultraviolet anti-aging agents, and leather coated with polymer materials are all prone to yellowing when exposed to sunlight. In addition, fabrics, as an indispensable part of the upper material, are also prone to yellowing during long-term storage, transportation and wearing.

Advisory Message