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   TO:         I4235700 IBMMAIL   new address for ipc technet 25.6.96

   FROM:       DSTEWART EX2       D.Stewart        - Product Development Manager.

   DATE:       14 January 1997
   SUBJECT:    SUBSTRATE MATERIAL

    Eli,
           We have used Nelco N4000-6 for a couple of years now,
    specifically on Mil work, but also for a customer who insists that
    he needs a high temperature system to enable REWORK of BGAs. The -6
    system is epoxy, and as such processes in a similar way to the
    lower Tg materials, but with a modified (longer) press cycle. Our
    drilling and desmear parameters were set so that they would cope
    with this material as well as standard FR4 without any changes, but
    it may be necessary to make your desmear slightly more agressive.

    Dougal Stewart
    Product Development Manager
    Exacta Circuits
    Scotland

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