DSC is a test that will indicate the cure level of the material.  TMA
and DMA testing may give you more information on the package integrity
over just DSC.  Many labs offer this type of testing and your base
materials supplier should provide sample testing on laminate your have
purchased at no charge.

Jeffrey Bush
Director, Quality Assurance and Technical Support

VERMONT CIRCUITS INCORPORATED
  76 Technology Drive - POB 1890
    Brattleboro, Vermont 05302
      Voice: 802.257.4571.21 Fax: 802.257.0011
           http://www.vtcircuits.com
 

-----Original Message-----
From: Murulidhara [mailto:[log in to unmask]] 
Sent: Wednesday, May 11, 2005 3:19 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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