Flame Resistant Clothing (FRC) — NFPA & ASTM Certified FR Workwear

Flame Resistant (FR) clothing is workwear specifically engineered to self-extinguish when exposed to flame or arc flash — it does not continue to burn once the ignition source is removed. FR garments protect workers by limiting burn injury and preventing the melting or dripping of fabric onto skin, which can cause severe secondary burns. FR clothing is required by OSHA in industries where workers face flash fire or arc flash hazards, including oil & gas, electrical utilities, petrochemical, welding, and mining.

NFPA 2112 covers flame resistant garments designed to protect against flash fire exposure, commonly required in the oil & gas and petrochemical industries. Garments are tested and rated by ATPV (Arc Thermal Performance Value) measured in cal/cm².

NFPA 70E (paired with ASTM F1506) governs arc flash protection for electrical workers. It assigns garments to Hazard Risk Categories: CAT 1 (minimum 4 cal/cm²), CAT 2 (minimum 8 cal/cm²), CAT 3 (minimum 25 cal/cm²), and CAT 4 (minimum 40 cal/cm²). Many FR garments are dual-certified to both standards. To choose correctly, your employer must first conduct a hazard risk assessment to identify which standard and category applies to your work environment.

Inherent FR fabrics — such as Nomex®, Kevlar®, and modacrylic blends — are flame resistant at the fiber level. The protection is built into the material itself and cannot be washed out or worn away. These garments maintain their FR properties for the life of the garment.

Treated FR fabrics are typically cotton or cotton-blend base fabrics that have had FR chemistry applied during the manufacturing process. They are generally less expensive, but the FR treatment can degrade over time with improper laundering, bleaching, or heavy wear. Always follow the care label instructions on treated FR garments to maintain their protective properties.

OSHA 29 CFR 1910.269 (electric power generation and distribution) and 1910.132 (general PPE requirements) mandate FR clothing where workers are exposed to flash fire or arc flash hazards. Industries typically required to provide FR clothing include: oil and gas extraction and refining, petrochemical and chemical processing, electrical utility and power generation, arc welding, natural gas distribution, and mining. If your workplace has been assessed for flash fire or arc flash hazards, FR clothing is likely required for exposed workers.

Cal/cm² (calories per square centimeter) is the unit used to measure the Arc Thermal Performance Value (ATPV) of FR fabric — it indicates the amount of incident arc flash energy the garment can withstand before a wearer has a 50% probability of sustaining a second-degree burn. A higher cal/cm² rating means greater protection. For example, a CAT 1 garment requires a minimum rating of 4 cal/cm², while a CAT 4 garment requires at least 40 cal/cm². Your employer's arc flash hazard analysis will specify the minimum cal/cm² rating required for your work tasks.