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November 2005

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Subject:
From:
"Stadem, Richard" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard
Date:
Fri, 11 Nov 2005 12:49:16 -0600
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Hi, David. And Happy Friday, Technet!

Try Durostone. Be sure to spell it correctly (not Durastone)if you look
up its material properties. There are others.
An expert in this is Glenn Hawkins at DMI Pallet, Inc.  This guy knows
more about the properties of these types of materials than their
inventors do. And not only that, DMI Pallet makes the best fixtures in
the world for reflow, for wave solder, for rework, for anything. Superb
quality and service and the lowest price in the nation. I am unabashedly
this company's biggest fan, and no, I do not own any stock in the
company, and no, he is not my brother-in-law or cousin. I do not
ordinarily plug a product on the technet, but this company is so good at
what they do that I am making this exception. Glenn has more tricks for
clamping substrates, reducing thermal shock, etc. than you would
believe. Contact him at
[log in to unmask]     Check out their methods at
http://dmipallet.com/. It is a very informative site.
The Durostone products he uses have had very little warpage in
thicknesses greater than about 3mm for conventional size circuit boards
in conventional reflow or wave solder processes. For larger sizes I
recommend at least 6mm thick to ensure no warpage. I just purchased
several 70" long by 14" wide reflow fixtures to use on very long flex
circuit strips with lead-free reflow at 250 deg. C. They have withstood
several hundred passes through the reflow, and show no signs of warpage
whatsoever. The material is available as ESD-compliant, either
conductive or dissipative. 
Glenn does sell just the material in various thicknesses, or he will
machine it for you. I have been using this company as a fixture source
for more than 15 years, and I just cannot say enough good things about
them. They can design a pallet or fixture in a day and send you a
confirmation drawing, build it the next day, and you will have it in two
days, if necessary.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David Tremmel
Sent: Friday, November 11, 2005 12:20 PM
To: [log in to unmask]
Subject: [TN] High temp material

Hello all,

Would anyone recommend a high-temp material that can:

Be machined for various fixtures and chucks Can withstand lead-free oven
profiles Be used for 100 or more thermal cycles and still maintain its
form (down to 1mil tolerance) Does not absorb too much heat (compared to
a metal)


Thank you in advance,

David

_________________________________________________________________
MSN Latino: el sitio MSN para los hispanos en EE.UU.
http://latino.msn.com/

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