This document discusses heat and flame resistant clothing. It defines FR as flame resistant, referring to a material's ability to self-extinguish, and FRC as flame resistant clothing. It explains that electricians, utility workers, refinery workers, and others working near hazards like electric arcs or combustible dust wear FR clothing for protection. The construction of FR clothing involves a base, mid, and outer layer for maximum protection. The base layer is made of inherently FR fibers that will not burn or melt. The mid layer provides additional protection and the outer layer is a hardwearing workwear with FR reflective tape for visibility. It lists various FR safety standards and explains that FR fabrics are either cotton treated or made of inherently FR fibers