[Jewelry making - Article 00576] - Re: [Orchid] Infrared light

[Mike Aurelius]

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>      "green polycarbonate with a metallic gold-tone covering that is
>     said to exceed industry and government standards. The green plate
>     is not so dark as to prevent viewing work prior to lighting one's
>     torch." 

    Donna - this concerns me quite a bit. Shade 5 is shade 5 no matter
    what the manufacturer. Every shade 5 lens will transmit the exact
    same amount of light based on the ANSI standards I mentioned
    previously. An alarm bell rings when I hear "said to exceed industry
    and government standards" - which particular standards? How does it
    exceed them? As I mentioned, the standards are very specific in the
    amount of visible and infrared light transmitted at very specific
    wavelengths. A shade # filter has to match those requirements exactly
    in order to have that exact shade number. Did they show you the
    certification by the manufacturer or did they just tell you not to
    worry about it (while patting you on the head in a condescending
    manner)? 

    I have not seen a gold coated lens yet that can meet the ANSI
    standards for welding applications. Gold vacuum coated lenses show a
    very distinct wave pattern when tested and I seriously doubt whether
    they would qualify under the shade number standards. 

Mike Aurelius

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