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MERCANTA

www.mercanta.com order to reduce glare effects, or metal flash. Clear lenses are mainly used for indoor applications that require impact protection. They provide 99 % protection from harmful UVB rays. Smoke lenses protect from sunlight and excessive glare and are, therefore, ideal for all outside workers. Suitable for light duty applications only. CAUTION: Never use standard lenses whenever workers are exposed to arcs and infrared rays! ➤ Heat-Treated Lenses Heat-treated lenses are toughened safety lenses and meet the performance requirements of EN 169 for safety glass. They are available either clear, or in 13 shades for welding operations. Glass lenses may be mirror coated to reflect glare with full colour recognition. They can also come in yellow colour for low light environments, artificially lit areas, dawn and dusk. Yellow lenses provide good contrast in low light. 3.2 Cellulose Acetate Lenses They are available either standard-treated or coated. Acetate lenses are lighter than glass but will scratch more easily. They have high surface hardness and are recommended for applications, where pitting is a problem. Like standard glass lenses, they are available either clear or smoke green in order to prevent nuisance glare. Acetate is generally less expensive than glass but suitable for light-duty applications only. Coated acetate lenses resist chemicals better than glass lenses. Cellulose acetate lenses are suitable under working conditions up to +60° C. 3.3 Polycarbonate Lenses Basically they have the same advantages like cellulose acetate but are stronger and therefore suitable for medium- duty applications. Available hard-coated, they combine the lightweight, high impact, shatter and pitting-resistant qualities of polycarbonate with the abrasion resistance of glass. They are manufactured either clear or shaded and can be mirror coated, too. Available qualities of lenses: ➤ Standard lenses Standard lenses feature only the qualities of the material (either glass, cellulose acetate or polycarbonate). They resist dirt, dust and pitting. They must not be used for works involving shocks or ultraviolet and infrared radiation. ➤ Coating Coated lenses made of either cellulose acetate or polycarbonate are scratch-resistant, and reduce fogging-tendencies to a minimum. Scratch resistance is achieved by a quartz-crystal coating on the outside of the lens and anti-fog properties by a non-fogging coating on the inside. Such lenses are optically correct and absorb both UVA and UVB light up to a wavelength of 400 nanometers. Therefore they are used in foggy and steamy atmospheres, like in chemical laundries, or laboratories, as well as for all applications involving high humidity, temperature changes, or great worker exertion. Hard-coated polycarbonate lenses are impact resistant and also heat-resistant up to 250°C. ➤ Heat Treatment Heat-treated glass lenses are made of toughened safety glass. This means they are more impact, shock and abrasion resistant than standard lenses. In the event the glass should break, it generally will crumble into cubical particles inside the frame rather than shatter into slivers. The wearer’s eyes will not be hurt. Heat treated lenses are suitable for all welding operations. ➤ Laminating Laminated glass lenses consist of two toughened safety lenses which are pasted together by means of a clear transparent plastic foil. In case of lens damage the broken pieces of the outer lens remain adhered to the foil. These lenses are shatterproof to the highest extent. With these lenses the highest degree of eye-protection can be achieved. Attention Inspect your eye protection devices regularly for signs of breakage or damage. Scratched or pitted lenses are weakened lenses and should be replaced immediately; scratched and pitted plastic lenses reduce vision. Lenses can be cleaned either by a cleaning and sanitizing fluid, or by wiping tissues. Retaining rings of cup- and cover-goggles should be replaced when scored or cracked. Lenses should be replaced in pairs only. A wide selection of eye wear replacement parts is available for all eye-protection devices. Face Protection Highspeed flying particles or chemical splash are rarely aimed directly at the eyes. A full face visor offers the maximum protection in extreme conditions. Full face protection is provided by a visor which can be attached to either a safety helmet or - where head protection is not required - to a head mounted browguard. It does, however, not keep out dust or gas. We offer headwear-mounted face shields to protect the worker‘s face from impact, heat, flying particles or glare. Selection of the appropriate accessories is determined by the nature and severity of the hazard. Face-protection devices should be used in: ➤ Chemicals Handling Involving splash, acid burns, and fume hazards ➤ Furnace Operations Involving glare, heat and molten metal hazards ➤ Grinding Work Involving flying particles hazards ➤ Laboratory Work Involving chemical splash and glass breakage hazards ➤ Machining Work Involving flying particle hazards ➤ Welding Involving glare and flying sparks hazards 17

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