thanks for taking the time to respond.
the answers to your questions are:
- unleaded solder
- soldering iron
- skilled technicians
The other answers I got here and on TechNet pointed me towards Polyimide
materials
thanks again!
Jack
On Wed, Feb 3, 2016 at 8:52 AM, Peter G. Houwen <[log in to unmask]>
wrote:
> leaded or unleaded?
>
> Soldering iron or hot air?
>
> How skilled are the techs?
>
> /129 will handle a bunch of manual leaded rework, I'd worry about lead
> free. Especially if the techs aren't skilled, or are impatient and use too
> much heat. I've never been a big fan of the slash sheets. I think they
> can be ambiguous and restrictive at the same time, and don't really reflect
> the laminates being manufactured. If you do need to specify material to
> take this abuse, specify what parameters are important. Peel strength
> would be important. Repeated heat cycles break down things like CAF
> resistance, Z-Axis expansion, Tg. So you may need to spec things like
> non-dicy, different Z-Axis measurement procedures. And oddly enough, after
> a few cycles, some 170+ Tg materials end up with a lower Tg than materials
> that started at 140.
>
> I'm not sure I answered your question or created more. My only actual
> answer is that slash sheets might not be good enough for this situation.
>
> The designer in me says address the root. Regardless of PCB material,
> those multiple cycles cost money and increase risk. If it was only
> happening in development, let it go. If it's expected to continue for
> production, look into it.
>
> Pete
>
>
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