The way Alpha Level fixes bowing in PCB's is by the application process of
the coating.  The coating is applied directly over copper.  It is a neutral
pH, and is not heated pass 120 degrees F.  As you well know HASL requires a
much higher temperature for application.  Since the coating is applied
directly over copper and not nickel the coating is even flatter than gold
immersion.
After extensive testing and analysis we have switched over to the silver
immersion coating and have eliminated all of our bowing issues with our
thinner PCB's.

Give it a try if you have PCB bowing issues.

Thanks,
Kathy Palumbo

> ----------
> From:         Eltek Ltd. - Process
> Engineering[SMTP:[log in to unmask]]
> Sent:         Tuesday, July 21, 1998 5:07 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Super flat PCB
>
> At 08:28 21/07/98 +0300, you wrote:
> >You could try AlphaLevel.
>
> Could be so kind and explain to the forum , how AlfaLevel ( alternative
> finishing for soldering ) will fix bowed boards ??? If it works in this
> way
> , this is really great product .
>
>
> >
> >[log in to unmask] wrote:
> >
> >> Technetters.
> >> We are manufacturing multilayer printed circuit boards.
> >> One of our customers request us to make 6 layer memory module
> >> board(7"X6.3"X0.05"t) of which bow tolerance is Max 0.30%.
> >> It's very tough job.
> >> Our 1st yield for that board is lower than 80%.
> >> Lamination stack height, heating rate, cooling rate, cushion material,
> layup
> >> construction, coppper balance, baking....
> >> These parameters which I thought related with flatteness were tested
> many
> >> times. But we still see bowed boards(Max 0.70%).
> >> I will make every effort to make SUPER FLAT BOARD.
> >> Any advice would be appreciated.
> >> Thanks in advance.
> >> Herold Green
> >> ----------------------------------
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> >Jacob Mozel
> >11 Hakalanit St
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> Edward Szpruch
> Eltek Ltd - Israel
> Tel  972 3 9395050
> Fax 972 3 9309581
> E-mail :  [log in to unmask]
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