Flammable/combustible construction materials shall be avoided in spaces housing Class-4 lasers. Materials used for beam stops or beam barriers shall not off-gas, nor be combustible at the beam power used. Curtains used as laser barriers shall not off-gas, and shall be flame-retardant or, preferably, flame-proof or laser-rated.
ANSI Z136.1 4.3.8
NFPA 115 4, 6
NFPA 115 advises that laser beams with irradiances above 2 W/cm2 should be regarded as a fire hazard
Provisions shall be made for the safe storage of laser dye solutions, solvents, and other flammable materials well away from the laser use area.
8 CCR 5191
NFPA 115 9