ISO 25980:2014

ISO 25980:2014 specifies safety requirements for transparent welding curtains, strips, and screens to be used for shielding of work places from their surroundings where arc welding processes are used. They are designed to protect people who are not involved in the welding process from hazardous radiant emissions from welding arcs and spatter.
Welding curtains, strips, and screens it specifies are not intended to replace welding filters. For intentional viewing of welding arcs other means of protection are used.
It is not applicable for welding processes where laser radiation is used.
NOTE     Darker welding curtains or screens are advisable for mutual separation of adjacent work places for reasons of comfort.