Subject: | |
From: | |
Reply To: | (Leadfree Electronics Assembly Forum) |
Date: | Wed, 12 Jul 2006 08:44:24 +0200 |
Content-Type: | text/plain |
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Hello Werner,
thanks für that interesting data. But I've two questiions:
1.) "TE(50Ÿ260)"
What's the meaning ? Thermal expansion in z-direction ? with "50Ÿ260"
representing the temperature range ?
2.)"STII"
What's the definition of that data ?
Regards
Wolf-Dieter
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Wolf-Dieter Schmidt
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THALES Defence Deutschland GmbH
Industrial Engineering
Land & Joint Systems
Ostendstrasse 3
D-75175 Pforzheim - Germany
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Phone: +49 7231 15 3386
Fax: +49 7231 15 3390
mailto: [log in to unmask]
http://www.thalesgroup.com
> -----Original Message-----
> From: Werner Engelmaier [mailto:[log in to unmask]]
> Sent: Tuesday, July 11, 2006 11:00 PM
> To: [log in to unmask]
> Subject: Re: [LF] Price premium for Tg = 170 Deg C?
>
>
> Hi,
> I have not heard that Dicy-cured materials are more CAF-prone than
> non-Dicy-cured resins. The problem of CAF is to a large
> degree determined by drilling
> quality and distance between PTHs [=distance for the CAF-path
> aling glass
> fibers].
> In terms of CTE and Tg— the CTE's vary for either Dicy-cured or
> non-Dicy-cured resins; it is the product of alpha-2-CTE x
> delta-T that determines what the
> thermal expansion mismatch is with the copper barrel——the
> larger this product
> the worse it is, everything else being equal. Of course, you
> can plate more
> and/or better Cu into the holes.
> In my white paper I have a table with STII-values [Soldering
> Temperature I mpact Index], which clearly shows the
> differences between many of the available
> materials.
>
> Table I. Various Laminates/Prepregs with their Properties and
> STII-Values.
> Vendor Designation Tg(TMA) Td(5%) TE(50Ÿ260) STII
> High-End Standard Laminates
> TUC/Taiwan TU-622-5 135°C 310°C 4.1% 181
> ISOLA IS400 135°C 330°C 3.0% 202
> NELCO N4000-7 150°C 330°C 3.7% 203
> Laminates with Limited Lead-Free Compatibility
> TUC/Taiwan TU-662 145°C 340°C 3.4% 209
> ISOLA FR250 HR _140°C 350°C 3.4% 211
> Lead-Free Compatible Laminates
> TUC/Taiwan TU-722 172°C 330°C 3.5% 216
> TUC/Taiwan TU-642 _135°C 360°C 2.7% 220
> TUC/Taiwan TU-742 140°C 370°C 3.1% 224
> ISOLA IS410 _170°C 350°C 3.5% 225
> NELCO N4000-11 170°C 345°C 3.2% 225
> ISOLA FR408 _170°C 360°C 3.5% 230
> NELCO N4000-29 175°C 350°C 3.0% 232
> TUC/Taiwan TU-752 170°C 350°C 2.7% 233
> ISOLA 370 HR _170°C 350°C 2.7% 233
> NELCO N4000-12 180°C 370°C 3.6% 239
> Advanced Lead-Free Compatible Laminates
> ISOLA IS415 _180°C 370°C 2.9% 246
> NELCO N4000-13 200°C 365°C 3.5% 247
> TUC/Taiwan TU-832 210°C 340°C 2.5% 250
> ISOLA IS620 _205°C 353°C 2.8% 251
> ISOLA IS500 _170°C 400°C 2.8% 257
> TUC/Taiwan TU-842 _170°C 390°C 2.1% 259
> POLYCLAD LD-621 _190°C 400°C 3.0% 260
>
>
>
> Werner
>
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