ASTM F1959/F1959M

Arc-rating test for clothing materials

Requirements & test methods

ASTM F1959/F1959M-24b measures the arc rating of flame-resistant materials and material combinations under a controlled open-air electric arc.

Checks flame resistance before arc testing.

Char length < 150 mm; afterflame < 2 s.

Exposes flat, vertical specimens to a controlled arc at approximately 2,100 kW/m², or 50 cal/(cm²·s).

Arc rating in cal/cm² for the tested single layer or layer combination.

Determines the arc rating from the lower applicable ATPV or EBT result.

Arc-rating endpoints:

Arc-rating endpoints
Result	Meaning
ATPV	Energy associated with a 50% probability of reaching the predicted second-degree burn threshold.
EBT	Energy associated with a 50% probability of material breakopen.

Arc-rating data for materials used in clothing for electrical tasks at process facilities.

Laboratory determination of a material or material assembly's arc rating.

Arc-rating data for clothing used during electrical maintenance in foundries.

Permanent multi-norm protection balanced with all-day wearer comfort.

View fabric Arc flash + wind + rain

PFAS-free tri-laminate protection for changing outdoor conditions.

View fabric Aluminum + viscous alloys

Lightweight foundry protection enhanced with TENCEL™ for comfort.

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