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Subject:	Re: Solder Mask expectations / pushing the envelope?
From:	Lee Parker <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Lee Parker <[log in to unmask]>
Date:	Mon, 15 Nov 2004 15:05:05 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (57 lines)

Robert

I do not consider this an unreasonable stress. I would not however
assume the issue is the soldermask until there is some supporting
evidence such as microscopic or SEM photographs characterizing the
failure.

Best regards

Lee

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Coburn
Sent: Monday, November 15, 2004 2:50 PM
To: [log in to unmask]
Subject: [TN] Solder Mask expectations / pushing the envelope?

Hi T'Netters;

One of my customers stated they were experiencing what sounded like a
shorting problem due to ionic contamination.
Can't tell if the problem originates beneath the mask or not.
The customer was testing assemblies at 85o C, 85% RH, 400 volts for 168
hours.

The question is: is the Customer expecting too much from a Solder Mask?

TIA,
Rob

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