On Nov 27, 2012, at 4:46 PM, "Vladimir Igoshev. PhD" <[log in to unmask]> wrote:

> Hello board gurus,
> 
> We ran a DSC test on a Pb-free PWB and found that Tg1 was around 172C,
> while the second heating produced Tg at about 185C. Below is a reply
> from the board vendor, stating that there is no such a thing as
> undercured laminate for that specific type of material.
> 
> I'd greatly appreciate any constructive comments.
> 
> "...That type of delta Tg would only apply to dicy materials when Tg1 and Tg2 are less than the advertised Tg of the material.
> EM-827 is a high Tg, filled phenolic and as such for these type phenolics, there is no delta Tg that signifies undercure.
> With filled phenolics like this both the Tg1 and Tg2 would be under the advertised Tg to be undercure and this is not the case.
> As you cure more and more these type phenolics both Tg1 and Tg2 move
> to higher and higher values and the delta Tg remains about the same".
> 
> 
> -- 
> Best regards,
> 
> Vladimir Igoshev. PhD                          mailto:[log in to unmask]
> 
> SENTEC Testing Laboratory Inc.
> 11 Canadian Road, Unit 7.
> Scarborough, ON M1R 5G1
> Tel: (416) 899-1882
> Fax: (905) 882-8812
> www.sentec.ca
> 
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