This standard BS EN 60825-4:2006+A2:2011 Safety of laser products is classified in these ICS categories:
13.280 Radiation protection
31.260 Optoelectronics. Laser equipment
This part of IEC 60825 specifies the requirements for laser guards, permanent and temporary (for example for service), that enclose the process zone of a laser processing machine, and specifications for proprietary laser guards.
This standard applies to all component parts of a guard including clear (visibly transmitting) screens and viewing windows, panels, laser curtains and walls. Requirements for beam path components, beam stops and those other parts of a protective housing of a laser product which do not enclose the process zone are contained in IEC 60825‑1.
In addition this part of IEC 60825 indicates:
how to assess and specify the protective properties of a laser guard; and