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:?a) how to assess and specify the protective properties of a laser guard; and?b) how to select a laser guard.