Dear Technetters,

  One of our PCB customers is considering to change his laminate from FR-4
to FR-5 mainly because of
  large amount of warp & twist in his multilayered module PCB.
  I couldn't believe that FR-5 is more effective than FR-4 in relation to
warp & twist even though some of
  FR-5 properties including thermals and mechanicals are dominating.
  Any comments or experienced opinion would be appreciated.
  Is FR-5 really effective to manufacture "no bowed" multilayer PCB?

  T.Y.Kim

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