What is an Arc Rating?

Arc-Rated Insulated FR Nomex® IIIA Overalls - ATPV of 4.6 cal/cm² (HRC 1) - Khaki

Arc-Rated Insulated FR Nomex® IIIA Overalls - ATPV of 4.6 cal/cm² (HRC 1) - Khaki

An Arc Rating describes the amount of energy a certain fabric can defend against before there is a 50% chance that the wearer will suffer a second-degree burn through that fabric. The Arc Rating is usually expressed as an ATPV (Arc Thermal Performance Value), measured in calories per square centimeter (cal/cm²) of fabric. If a fabric has an ATPV arc rating of 8 cal/cm², that means that this fabric can withstand 8 calories of energy (heat, flame) per square centimeter before there is a 50% chance that the wearer will suffer a second-degree burn through that fabric.

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