Fire resistance

In France, there is a rating scale with 5 categories that define the fire resistance of materials:

• M0: non-combustible
• M1: combustible (non-flammable)
• M2: combustible (flame retardant)
• M3: combustible (moderately flammable)
• M4: combustible (highly flammable)

This French rating scale has since been replaced by the European classification (Euroclasses) defined by the EN 13501-1 standard.