FR pants are designed to resist ignition and burning, while arc flash pants provide additional protection against brief, high-energy electrical arcs. Arc flash pants typically have a higher ATPV rating than FR pants.

ATPV (Arc Thermal Protective Value) is a measurement of the resistance of a fabric to an electric arc. It indicates how much heat the fabric can block before the heat transfer to the skin would result in a second-degree burn.

While these pants offer protection against flames and arc flashes, they may not provide full protection against other hazards such as extreme heat, chemicals, or impact.

FR pants are often made from inherently flame-resistant materials such as Nomexu00ae, Kevlaru00ae, or PBIu00ae. Arc flash pants, in addition to these materials, may incorporate metalized fibers or coatings to enhance arc flash protection.