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December 1999

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Subject:
From:
Alain Mathieu <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 15 Dec 1999 16:21:24 -0500
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Hi TechNetters.
 
We are a OEM that manufactures Hi-frequency products  ( 5Mhz to 1Ghz range) 
and therefore we use pcb (bare board) with big ground planes on both sides.
 
all our boards are FR-4  with solderMask over bare copper.
 
When we go thru the wave soldering process we experiment blistering and
peeling offon the ground plane. 
 
We use Alpha No-Clean 26F flux ,  preheat top side at 230oF-240oF, bottom
side 300-320oF and a dwell time of 2.4-2.6 sec.
Solder Bath temp is 480oF.
 
In the past the pcb mfr was using a different Soldermask  but now he uses 2
brands with approximately the same results :  Epic #200 and Entone #3242.
The pcb Mfr was suspecting a problem with the curing, the thickness or a
contamination before soldermask application that could explain
 
Is there any one who had the same or similar problem?  Any help on how to
resolve this would be greatly appreciated.
 
Alain Mathieu
Electroline Equipment Inc.
[log in to unmask]
 

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