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| From [log in to unmask] Thu Jan 2 11: |
30:17 1997 |
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>WHAT BOARD MATERIALS ARE BEST SUITED FOR HOT AIR LEVELLING WITH RESPECT
>TO MEASLING?
>
>HOW DOES ONE PREVENT MEASLING?
>
>DO SOME MATERIALS NOT WITHSTAND THE HEAT, AND IF SO WHICH ONES?
Higher Tg resins (above 150); lower glass content & thinner glass fibers will
help; as will a good prebake.
Larger holes densely packed and a 7628 glass construction are about the most
likely to measle at the bare board level. Might also want to double check the
cure & drilling on a problem board.
Tom Waznis
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