PERSONAL PROTECTION EQUIPMENT / 159 www.nortonabrasives.com UNDERSTANDING LENS MARKING UNDERSTANDING FRAME MARKING U F EN 166 2 U F 1.2 1 N FILTER TYPE 2 - Code No: indicates the type of filter. 2 & 3 = UV C - Enhanced colour recognition for lenses category 2 or 4 MANUFACTURER U - Manufacturers identification MECHANICAL RESISTANCE F - Symbol for mechanical strength (F for low impact) T - Symbol for resistance to high speed particles at extremes of temperature (-5°C & +55°C) follows impact grade SHADE NUMBER 1.2 - Indicates the shade of the lens (between 1.2 & 8for spectacles & goggles) OPTICAL CLASS 1 - Optical class 1 = permanent wear 3 = occasional wear ADDITIONAL REQUIREMENTS K - K Symbol for resistance to surface damage by fine particles N - Symbol for resistance to fogging of lenses MANUFACTURER U - Identification of the manufacturer MECHANICAL RESISTANCE F - Symbol for mechanical strength (F for high speed particles, low energy) T - Symbol for resistance to high speed particles at extremes of temperature (-5°C & +55°C) follows impact grade OPTICAL CLASS EN 166 - Optical class (1 = permanent wear, 3 = occasional wear) Filter type Additional requirements Optical class Mechanical resistance Shade number Manufacturer PERSONAL PROTECTION EQUIPMENT
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