ISO 4851:1979
ISO 4851:1979


Gives the numbering of and transmittance requirements for filters. It defines guidance and their selection and use. Optical test methods form the subject of ISO 4854. Non-optical test methods form the subject of ISO 4855. The symbol for filters includes a code number and the shade number corresponding to the filter. The determination of transmittance is described in clause 5 of ISO 4854.

General information 

  •  :  Withdrawn
     : 1979-02
  •  : 1
     : 2
  •  : ISO/TC 94/SC 6 Eye and face protection
  •  :
    13.340.20 Head protective equipment

Sustainable Development Goals

This standard contributes to the following Sustainable Development Goal:

Life cycle

Got a question?

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)

Keep up to date with ISO

Sign up to our newsletter for the latest news, views and product information.