A "magic" number within the industry is 5-6 C, unless I'm completely out to lunch.
Regards,
Vladimir
SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca
-----Original Message-----
From: "Honsowetz, Eric" <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Wed, 28 Nov 2012 12:50:51
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
"Honsowetz, Eric"
<[log in to unmask]>
Subject: Re: [TN] Delta Tg on a Pb-free board.
Yes - this is not an area of expertise for me - I have seen reports that suggest that under a 2% change in Tg would be a number...
eric
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
Sent: Wednesday, November 28, 2012 12:05 PM
To: [log in to unmask]
Subject: Re: [TN] Delta Tg on a Pb-free board.
One should keep in mind that the method doesn't specify a pass/fail number!?
Regards,
Vladimir
SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca
-----Original Message-----
From: Victor Hernandez <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Wed, 28 Nov 2012 10:55:11
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
<[log in to unmask]>
Subject: Re: [TN] Delta Tg on a Pb-free board.
Eric,
Thanks for sharing. This shared Test Method will test for laminate properly cures to specifications. Now the question is. Is there a Test Method for evaluating the woven fiber glass cloth adhesion property to the resin system,?
"X"
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Honsowetz, Eric
Sent: Wednesday, November 28, 2012 8:35 AM
To: [log in to unmask]
Subject: Re: [TN] Delta Tg on a Pb-free board.
IPC-TM-650 2.4.25
eric
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Wednesday, November 28, 2012 7:30 AM
To: [log in to unmask]
Subject: Re: [TN] Delta Tg on a Pb-free board.
Board guru,
Is there a test method, IPC Standard, for testing how well a laminate has been cured, IS415.
"X"
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Zweig
Sent: Tuesday, November 27, 2012 4:11 PM
To: [log in to unmask]
Subject: Re: [TN] Delta Tg on a Pb-free board.
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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