EYE PROTECTION Certification Mark Manufacturer Identity KN 1 1.2 2C F Mechanical Resistance Optical Class 1 ± 0.06 dioptres Can be worn at all times 2 ± 0.12 dioptres Should only be worn for occasional use 3 ± 0.25 dioptres Should not be worn for long periods K Resistance to surface damage by fine particles N Resistance to lens fogging T Extreme temperature of -5°C and +55°C Optional Requirements Filter Type Code 2 UV Filter 2C or 3 UV Filter with good colour recognition 4 Infrared Filter 5 Sunglare Filter 6 Sunglare Filter with IR specification Scale Number (Shade) 1.2 Clear or Amber 1.4 Blue or I/O Waterproof 1.7 Minimises or I/O 2.5 Grey or Revo 3.1 Dark Grey or Mirror (T) : The frame/lens has had an additional extreme temperature test at -5°C and +55°C GUIDE TO LENS MARKINGS 166 F If protection against high-speed particles at extreme temperatures is required then the selected safety eyewear product should be marked with the letter T immediately after the ‘Mechanical Strength’ letter; eg: FT, BT, or AT. If the ‘Mechanical Strength’ letter is not followed by the letter T, the safety eyewear product shall only be used against high-speed particles at an ambient temperature. If the frame and lens display different certification marks (F,B, or A), the lowest level should be assigned to the entire safety eyewear product. Riley Identity Number of the EN Standard S Increased Strength F Low Energy Impact, resists a 6mm, 0.86g ball at 45m/s B Medium Energy Impact, resists a 6mm, 0.86g ball at 120m/s A High Energy Impact, resists a 6mm, 0.86g ball at 190m/s Mechanical Strength Certification Mark Fields(s) of Use (where applicable) None General Use 3 Liquid droplets or splashes 4 Large dust particles < 5 μm 5 Gases and small dust particles < 5 μm 8 Short circuit electric arc 9 Molten metal and hot solids IMPACT LEVEL MAX. SPEED EYE PROTECTION TYPE A (T) High Energy Impact 190 m/s Faceshields B (T) Medium Energy Impact 120 m/s Faceshields and Goggles F (T) Low Energy Impact 45 m/s Faceshields/Goggles/Spectacles S Increased Robustness 5.1 m/s Spectacles (CR39 lenses) GUIDE TO TEMPLE MARKINGS 11
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