Dear TechNetters:
     
       I am wondering why Polyimide Film materials such as Kapton, Apical, 
     Upilex etc. are not recognized as a same ANSI grade although these PI 
     films have very similar molecular formula and properties. 
     
       As we are manufacturing Flexible Printed Circuits using these 
     materials, our UL application is very complexed because they are not 
     recognized as ANSI.
     
       Does anyone trying to set up ANSI grade for polyimide films in use 
     of FPC?  Or does anyone knows suitable forums for this discussion?
     
     Best Regards,
     
     Toru Koizumi(Mr)
     Fujikura Ltd. Japan
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