ISO 4850-1979 Personal eye-protectors for welding and related techniques - Filters - Utilisation and transmittance requirements

First edition. International Standard ISO 4850 was developed by Technical Committee ISO/TC 94, Personal safety - Protective clothing and equipment, and was circulated to the member bodies in May 1977. — 7 p.
This International Standard specifies the numbering of, and transmittace requirements for filters intended to protect operative performing manual work involving welding, brazewolding, arc gouging and thermal cutting. It also gives guidance on the selection and use of these materials.