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February 2004

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Subject:
From:
Greg Triggs <[log in to unmask]>
Reply To:
Greg Triggs <[log in to unmask]>
Date:
Fri, 6 Feb 2004 11:17:55 -0800
Content-Type:
text/plain
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text/plain (60 lines)
High heat can cause the epoxy resin to yellow. Some inks hide this others
use higher heat resistant resins. If boards are seeing multiple or extreme
heat incursions this need to be minimized

----- Original Message -----
From: "S.R. Madhuchandra" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, February 05, 2004 5:28 AM
Subject: [TN] White legend turning yellow


> Hello Technetters,
>
> One of our customer faced this unique problem with our boards
>
> The white legend (silkscreen) on the boards is changing to light yellow
> color after baking
> When he complained, we checked the boards in stock
> and we too observed the same phenomenon
>
> No other job processed on that day exhibited this behavior
> The baking parameters were normal as usual
>
> Any comments or views will be greatly appreciated
>
> cheers
>
> Madhu
>
>
>
>
>
>
> Scan by AT&S virus protection
>
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