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EN STANDARDS

Buying Guide
EYE PROTECTION Anti-mist? Anti-Scratch?

Does your eyewear reach
the standard?
‘K’ and ‘N’ are coating treatments that reach the
standard set by EN166. It’s easy how to find out, you
just look for the ‘K’ (anti-scratch) and ‘N’ (anti-mist) on
the lens of your safety glasses, goggles and face
shields.
By EN law all safety eyewear needs to be marked on
the lens. If the lens doesn’t have ‘K’ or ‘N’ marked on,
then they do not reach the required standard.

European Standards EN 166
To assist you in your understanding of markings on Eye Protection K - Anti-scratch treatment applied to the surface of the
lens whose hardness is a barrier against superficial
Products covered by this Standard you should note:
damages that can impair vision. The coating is permanent
Optical Standard: Frame Lens and it offers performance to the standards required by
Class 1: For continuous work - 1 EN 166.
Class 2: For intermittent work - 2 N - Anti-mist treatment, which, due to its chemical and
Class 3: For occasional work, but must not be worn continuously - 3 physical abilities, prevents the formation of condensation
by absorbing the humidity drops. The coating is
Mechanical Properties: permanent and it offers performance to the standards
Increased Robustness (General Purpose) - 5
High Energy Impact (190m/sec) A A required by EN 166.
Medium Energy Impact (120m/sec) Grade 1 B B NB: The “A”, “B”, “F” and “S” markings on frame and lens
Low Energy Impact (45m/sec) Grade 2 F F represent tests carried out on each component and
Increased Robustness – General Purpose Impact-Performance therefore may be different – in which case the lower level
at Extremes of Temperature T T must be assigned to the complete unit when making an
assessment.
Areas of Use:
Liquids (chemical) 3 - EN 169 Welding Filters
Large Dust Particles 4 - EN 170 Ultra-Violet Filters
Gas and Fine Dust Particles 5 - EN 171 Infra-red Filters
Short Circuit Electric Arc 8 - EN 172 Solar Protection Filters for Industrial Use
Molten Metals and Hot Solids 9 -
EN 175 Welding Work Equipment
Optional: EN 207 Laser Protection Eyewear
Resistance to Misting/Fogging - N
Resistance to Mechanical Damage (Anti-Scratch) - K EN 208 Laser Adjustment Eyewear

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