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International Journal of Interdisciplinary Research

Table 2 Nature of hazards and precautions for various classes of lasers

From: The use of laser in garment manufacturing: an overview

Laser class Nature of hazard (ANSI and OSHA) Precautions
Class 1 Low power, safe to view No potential hazard
Class 1M Low power, hazardous when viewed directly for longer than 1000 s Do not view directly with optical instruments
Class 2 Low power, hazardous when viewed directly for longer than 0.25 s Do not stare into the beam
Class 2M Medium power, nonhazardous when viewed directly for less than 0.25 s Do not stare into the beam, do not view directly with optical instruments
Class 3A Medium power (0.5 W), are hazardous when viewed directly Avoid direct eye exposure
Class 3B Medium power (0.5 W), are hazardous when viewed directly Avoid direct eye exposure
Class 4 High power (>0.5 W), produce ocular, skin and fire hazards Avoid eye or skin exposure to direct or scattered radiation