Dave

Like most indirect measurements, I doubt that anyone can tell you what is 
required for your process. I suggest that you test a few boards that meet a 
criteria with which you are comfortable. If they assemble without 
delaminating then I would set this is the requirement for future product.

Best regards

Lee


----- Original Message ----- 
From: "Dave Seymour" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, March 23, 2007 10:19 AM
Subject: [TN] T260 tests


> Good Morning,
>
> This is my first time having a test house run the IPC T260 test 2.4.24.1.
>
> The Time to delamination test determines how long before the board
> starts to delaminate.
>
> The Question:
>
> What "Time to delamination" is good enough for lead free assembly?
>
> The results for the tests we had run on a 14 layer, FR408 samples were
> in 25-27 minutes
> range on a number of samples.
>
> It would seem to me, that this test is only a relative comparison
> between different materials.
> For example if material  "A" was 12 minutes and material " B" was 20
> minutes, one could
> assume that "B" was a better material than "A". But, one could not
> determine the if the material
> could survive all the temp cycles required by assembly.
>
> Is this a correct assumption?
>
> I'm willing to share pictures and charts, if anyone is interested.
>
> Thanks.
> Dave
>
> -- 
> Dave Seymour, CID+
> Catapult Communications Inc.
> 800 Perimeter Park Dr, Suite A
> Morrisville, NC 27560
>
> Direct: (919)653-4249
> Main: (919)653-4180
> Fax: (919)653-4297
>
> [log in to unmask]
>
>
>
>
>
>
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