Historical
DIN EN 170:2003
Personal eye protection - Ultraviolet filters - Transmittance requirements and recommended use
This European Standard specifies the scale numbers and transmittance requirements for filters for protection against ultraviolet radiation. The other applicable requirements for these types of filters are given in EN 166:1995. Guidance on the selection and use of these filters are given in Annex A.
Deutsches Institut für Normung [din]