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Subject:	Re: HASL Thickness
From:	Werner Engelmaier <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Wed, 22 Aug 2001 10:47:35 EDT
Content-Type:	text/plain
Parts/Attachments:	text/plain (19 lines)

Hi Frank,
Colin Lea has shown that HASL-thicknesses of less than 2 microns [=80
micro-inches] have limited shelf lives--getting worse the thinner you go.
Unless you do not need shelf life, I would stick with 100 to 500 microinches.
There is nothing wrong per se with 1000 microinches, except of course, that
the thicker the HASL the less flat the surface.

Werner Engelmaier

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