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April 2007

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Subject:
From:
Joyce Koo <[log in to unmask]>
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Date:
Tue, 3 Apr 2007 16:38:49 -0400
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if PCB outgas more (different from the qualified run), you might have
uncured laminate.  The Tg and CTE may be off too.  You may have cracked PTH
too... etc.etc.
Outgas product can deposite on your insertion connector, relay contact, wire
bonding pads, etc.etc.  and cause your headach... If you reflow 2x of your
board, one side is better looking than the other (shining), you might have
outgas...(uncured mask)... you might have attract more ionics and dust.. or
attract more moistures.. Outgas usually are bad news... if you qual
properly, you should not see any problem...(provide the vendors' application
engineer stay with the company... if he changes job, you may want to re-qual
again).
                         jk (my 1.74 cents)

abcd

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Dehoyos, Ramon
Sent: Monday, April 02, 2007 4:23 PM
To: [log in to unmask]
Subject: Re: [TN] IPC 6012 : Outgassing Criteria




	Wee Mei:
	Out gassing is the decomposition of the material or the
evaporation of the material that can be a problem in an enclosed
environment such in submarines or outer space. The gasses can cool and
deposit in fiber optics or suffocate personnel. Even some pure metals
turn into gas at low pressures, outer space. Most materials provide gas
from their make up or outgas, some very little and a few none at all.
	Ramon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei
Sent: Wednesday, March 28, 2007 11:17 PM
To: [log in to unmask]
Subject: [TN] IPC 6012 : Outgassing Criteria

Hello,

I was reading this IPC 6012 when I come across Section 3.11.1 Outgassing

1. What actually is outgassing?
2. Why is outgassing critical for PCB?
3. As the PCB consist of so many processes and different materials go
into making it, where did the outgassing come from? 4. Is the criteria
mandatory for all Class PCB or only specified application?
5. If for only specific application, which application and why?
6. Come to think about it, can the outgassing come also from the coating
we use to seal the assembly?

Hope someone out there can share with me (novice) on this issue.

Thanks and regards,
Wee Mei

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