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May 2005

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Subject:
From:
Brummer Chuck <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brummer Chuck <[log in to unmask]>
Date:
Wed, 11 May 2005 08:24:01 -0700
Content-Type:
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Murulidhara,

I think you would generally trust the data coming from your laminant
supplier.  If you had a failure that appeared to be the material you could
ask them to retest retains or from your stock.  If you had doubts at that
point you could use an independent lab with a DSC or a TAM, both fairly
expensive piece of equipment that require a level of expertise to operate.
Make sure you compare the Tg to the UTg and the difference should only be
about 2 or 3 C.

Chuck Brummer

-----Original Message-----
From: Murulidhara [mailto:[log in to unmask]]
Sent: Wednesday, May 11, 2005 12:19 AM
To: [log in to unmask]
Subject: [TN] Tg measurement


Dear Technetters,We are manufactureing professional grade PCBs mainly for
telecommunication equipments. We do not have facilty to measure Tg of copper
clad laminates. We go by the report given by the copper clad manufacturer.

Is it a must for PCB manufacturers to have facility for checking Tg value.
Or it is enough to go by the test report of laminate manufacturers.

What is the method used to measure Tg. Is it very expensive. Are there any
alternate methods to check Tg.

Thanks in advance,

Regards,
Murulidhara.S

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