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According to OSHA a welding helmet should have several components:







- The shell -- the shell of the helmet should have an eye piece that is resistant to electricity, heat and impact. It should be opaque so that light will be dimmed by it.







- Outer cover plate -- this should protect from scratches, impact and UV rays (radiation). This should also be made of polycarbonate plastic because this is the protection from UV.







- Filter lens -- this should be made from glass and contain a filter that controls the light that passes through the eyes. Each filter will have a different amount that it will let through and they come in shades from 2-14. As the numbers get higher, the filter gets darker and lets less light got through the lens.







- Retainer lens -- this should be plastic so that it stops pieces from the filter lens that might break from getting into the eyes.







- Gasket -- this should be made from a material that is insulated against heat and should be between the filter lens and the cover lens. This will protect the welder and the lens from any heat changes that may be sudden that might cause it to break.







A good helmet will have all of these features and comply with the standards that OSHA requires.





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