Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.

CTE Versus Tg


CTE Versus Tg | 18 December, 2000

In older resin materials used in printed circuit board fabrication, there seemed to be a direct relationship between CTE and Tg. Now with more modern resins that reationship no longer appears clear. Please comment.

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Charles Harper


Re: CTE Versus Tg | 18 December, 2000

I believe this is the case for the new,high performance LCPs(liquid crystal polymers),which are unique in their stiff,relatively thermally immobile structures.For other materials with higher Tg values than FR4,the basic relationship holds,but expansion does not increase dramatically until the higher Tg is reached.

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