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A=COM • Safe for the unprotected eye only, but potentially hazardous when optical instruments are used; • Medium power lasers either collimated with a large beam or highly divergent; • MPE can be exceeded when using optical instruments; • Nominal Hazard Zone: none for the unprotected eye. 4.3.10 Class 2 Lasers • Safe for unintended exposure, (less than 0.25 seconds)but hazardous when looking at for more than 0.25 seconds; • Visible (wavelength of 400-700 nanometers)low power lasers; • MPE is not exceeded provided the viewings are accidental only. MPE calculation assumes the blink reflex will stop the light after 0.25 second; • Nominal Hazard Zone: none for accidental exposure. 4.3.11 Class 2M Lasers • Safe for the unprotected eye when the exposure is unintended, (less than 0.25 seconds)but hazardous when looking at for more than 0.25 seconds or when optical instruments are used; • Visible (wavelength of 400-700 nanometers) medium power lasers either collimated with a large beam or highly divergent; • MPE is not exceeded provided the viewings are accidental only and only with unprotected eyes. MPE calculation assumes the blink reflex will stop the light after 0.25 seconds. Using optical instruments might bring the exposure above the MPE as well; • Nominal Hazard Zone: none for accidental exposure to the unprotected eye. 4.3.12 Class 2M Lasers and Greater • Areas where a Class 2M or higher, non-enclosed path laser beam is in use will be posted with standard laser-warning placards; • Beam shutters or caps will be used, or the laser turned off, when laser transmission is not actually required.When the laser is left unattended for a period of time(e.g., >5 minutes), such as during the lunch hour, overnight, or at change of shifts, the laser will be turned off; • Only mechanical or electronic means will be used as a detector for guiding the internal alignment of the laser.Aligning the laser with the unprotected eye is prohibited; • The laser beam will not be directed at employees. Laser units will be set above or below the heads of employees; • Employee exposure will be controlled to stay within the MPE limits specified in ANSI Z136.1- 2014 (or the most current edition). 4.3.13 Class 3R Lasers • Unsafe, except when handled carefully by experienced users.Accidental short exposure is considered as a small hazard; • Low power lasers; • MPE can be exceeded up to 5 times; • Nominal Hazard Zone: hazard area for the eye, none for the skin. 4.3.14 Class 3B Lasers • Unsafe without exception, laser safety goggles shall be worn within the nominal hazard zone. Focused lasers of this class are a potential fire hazard; Non-Ionizing Radiation(S3AM-121-PR1) Revision 3 July 31,2019 PRINTED COPIES ARE UNCONTROLLED.CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 4 of 8