Vic,
If I am oriented correctly as to what I am looking at I think you are
looking at the end of a broken glass fiber that is protruding through the
resin.
I forgot to mention earlier that a Tg and uTg spread should be only about
3 to 4 degrees C to assure very good cure, 5 to 6 is okay.
Another thing to look at is peels before and after solder float. If peels
increase more than 10% after solder float cure is in question.
Chuck
Charles W. Brummer | 3M Manufacturing Engineer
3M Electronic Solutions Division
3M Canoga Park, 8357 Canoga Ave. | Canoga Park, CA 91304
Office: 818 734 4930
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From: <[log in to unmask]>
To: <[log in to unmask]>
Cc: <[log in to unmask]>
Date: 11/28/2012 10:18 AM
Subject: RE: [TN] Delta Tg on a Pb-free board.
Chuck,
Here is a photo of an laminate anomaly I want to understand. The
anomaly follows the glass rod arch. I feel that the resin did not wet to
the glass rod. I am open to comments/suggestion/discussions.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chuck Brummer
Sent: Wednesday, November 28, 2012 11:52 AM
To: [log in to unmask]
Subject: Re: [TN] Delta Tg on a Pb-free board.
Vic,
What makes you think the resin and glass stick to each other? Having
worked in a prepreg treater I can suggest that when they make this product
a resin pump forces resin through the glass and coats both sides. Once
the resin is cured it sticks to itself surrounding the glass bundles and
holding them in place.
I have my doubts that the resin to glass has much of a bond.
Chuck
Charles W. Brummer | 3M Manufacturing Engineer 3M Electronic Solutions
Division 3M Canoga Park, 8357 Canoga Ave. | Canoga Park, CA 91304
Office: 818 734 4930
[log in to unmask] | www.3M.com
This message (including any attachments) may contain material, non-public
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and delete this message. Any disclosure, copying, or use of this
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From: Vladimir Igoshev <[log in to unmask]>
To: <[log in to unmask]>
Date: 11/28/2012 09:08 AM
Subject: Re: [TN] Delta Tg on a Pb-free board.
Sent by: TechNet <[log in to unmask]>
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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