Nylon, polyester and acetate may sound like innocuous fabrics, but wearing them might actually increase the severity of arc flash-caused injuries, because they tend to burn longer than other textiles and can even melt on the skin, according to OSHA1. The agency’s information on FR clothing, available at www.osha.gov, underscores a critical part of arc flash safety: knowing what not to wear is as important as determining the best FR (flame resistant) clothing for particular heat exposures. Additionally, taking the proper care of FR clothing ensures that it will continue to provide protection despite repeated use.