EN ISO 14116
Protective clothing - Materials, composite materials and flame-retardant clothing
Levels
Level 1: No flame spread, no melting residue, no afterglow, a hole can be formed.
Level 2: No flame spread, no melting residue, no afterglow, no hole formation.
Level 3: No flame spread, no melting residue, no afterglow, no hole formation, flame occurs not more than two seconds.