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May 1999

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Subject:
Re: Different Paste Height
From:
Rob Watson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 17 May 1999 15:18:31 -0400
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text/plain (52 lines) 
Are these boards HASL?  You may want to look to see if the coating is thicker on the one board.  Without
knowing anything else that is the only thing I can think of at the moment which would cause a difference..

Hope this helps,
Rob Watson
Sanmina Corp.


Poh Kong Hui wrote:

> Hi,
>
> Have anyone encountered that PCB from different suppliers give different
> paste height.
>
> We are using 3 PCB suppliers for one of our product, and the average paste
> height we are getting (on 2 suppliers), using 6 mil stencil with rubber
> squeegee (70 durometer) gives an average paste height of 6.5 mil. However,
> there is one supplier's PCB that gives the average paste of 8 mil.
>
> We need to double the squeegee pressure to achieve the paste height of near
> 7.0 mil
>
> Could anyone advise me the cause to such issue.
>
> Thanks
>
> Poh
>
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