Poh-
Sounds to me like a variation in the height of the surrounding silkscreen
ink.

> Larry Jindra
> TRW/Avionics Systems Division
> mailto:[log in to unmask]
> ph (619) 592-3424
fax(619) 592-3940
...


-----Original Message-----
From: Poh Kong Hui [mailto:[log in to unmask]]
Sent: Saturday, June 26, 1999 12:57 PM
To: [log in to unmask]
Subject: [TN] Different Paste Height


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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