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| Date: | Fri, 23 May 2008 07:03:03 +0100 |
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Graham is right but also depending on the solder mask type and cure you can also leach from the mask and see an increased reading before you get to the laminate surface where exposed.
Happy days
Bob Willis
2 Fourth Avenue
Chelmsford, Essex CM1 4HA
England
Tel 01245 351502
Fax 01245 496123
www.ASKbobwillis.com
-original message-
Subject: Re: [TN] Specific Gravity for ROSE Tester
From: Graham Naisbitt <[log in to unmask]>
Date: 23/05/2008 04:47
Hi Kenny
Be careful. IVF in Sweden demonstrated that prolonged exposure to
"hot" test solution (>30DegC) can induce a rise in the Resistivity or
Conductivity reading because you begin to leach out the (commonly
bromine) flame retardant out of the laminate.
Graham Naisbitt
On 22 May 2008, at 18:29, Ken Bloomquist wrote:
> Good Day All,
>
> We are having a discussion about the specific gravity of the 75%/25%
> solution in our ROSE tester. The question revolves around testing it
> hot or
> cold.
>
> Our ROSE tester runs at 112 degrees F and would like to know whether
> we
> should test the SG at hot or cold. If so what would we expect for a
> reading?
>
> Thanks all,
>
> KennyB
>
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