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EN166 marking explanation
“1” highest optical quality for permanent use
2 Ultra Violet filter
2C UV filter with enhanced colour recognition
2C-1.2 Light Transmission 74.4%-100% (UV EN170)
2-2 Light Transmission 29.1%-43.2% (UV EN170)
“B” High speed particles with medium energy impact (120 m/s)
“3” Liquid droplets and splash
“8” Electric arc resistance
“9” Non-adherence of molten metal and resistance to penetration of hot solids
“K” Resistance to surface damage by fine particles
“N” Resistance to fogging