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The technology is similar only improved from the original AOWC... In other words, the older lens were made from glass with the specific chemicals added when the glass was being manufactured... Now the newer AOSFG lenses are made of a proprietary polycarbonate (similar chemicals are blended into the polycarbonate as part of the proprietary manufacturing process, and then coated with 24K gold and finally coated with the exclusive DX anti-fog hard coat to minimize fogging, scratching, static and chemical attack and to protect the gold coating.
Now to answer your question from another perspective... The
AOWC acronym stands for
American
Optical
Weld
Cool, and
AOSFG acronym stands for
American
Optical
Safety
Filter or
Film
Gold. ;) So the difference is the 24 Karat Gold Filter or Film.
Here's the link for the .pdf on the newer lens from AO Safety which is now owned by Aearo Technologies Group which is part of 3M...
http://209.200.67.149/pdf/headnface/weldcool.pdfHere's the Aearo Technologies Group home page:
http://www.aearo.com/default2.cfm Here's AO Safety's product home page with links to all of their .pdf's which cover their wide variety of safety products:
http://www.aearo.com/industrial/prod_lit.cfmIf you want to discuss with their Technical Support department any other questions regarding their products, you can use this link:
http://www.aearo.com/industrial/techsupport.htmHopefully this will answer your question. ;)
Respectfully,
Henry