Mark @ Everlast
Advertiser
I've used the OSHA guide when recommending shade darkness to customers. Can't argue with the good ole gubment. They are always right aren't they? Least ways, you can cover yourself as an employer if you have people welding for you.
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9778
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9778