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Answer: Though Polycarbonate has a good resistance over many chemicals, acetate lens has a higher resistance compared to other lens materials

Answer: For welding work, welding shield with proper IR filter is the suitable solution.

Answer: No. There are different IR filter shades. The wavelength of IR emitted from different types of welding works varies. We should select the suitable filter. Generally IR 5 shade suits all gas welding types and IR 11 suits arc welding types.

Answer: Welding spectacles are suitable to be used by the helpers and supervisors. Direct welders should use welding shields and helmets.

Answer: Safety spectacles with smoked lens are suitable for working outdoor and in high light conditions. They should not be used for welding.

Answer: No. Amber lens enhances the vision by blocking some colors in the present light. It cannot be used in absence of light.

Answer: The indoor/outdoor spectacle with a slight tinted coating makes the user comfortable both in the outdoor and indoor light. So that is the most suitable spectacle for your work. 

Answer: Polycarbonate lens get scratched due to its physical property and the working conditions where we use it. So, to minimize scratches, a chemical coating is done. This is called hard coating.

Answer: The goggles give a complete sealing by tight fit and hence the user gets sweat soon. Also this sweating creates moisture that disturbs the vision. So, the goggles are provided with indirect ventilation holes for the comfort of the user and clear vision.

Answer: The life of a safety spectacle is not fixed and it varies according to the usage and maintenance. The working conditions also affect the life of the spectacle.