These values can be found in the draft document of the 4101B on the
committee's homepage at ipc.org. Slash sheets pertaining to Pb free
Fr4s are /99, /101, /121, /124 and do not know if it is there yet but the
latest /126. All these detail the Tg, Td, CTE etc.
Regards
Gerard O'Brien
Photocircuits Corporation
-----Original Message-----
From: Baski Devre [mailto:[log in to unmask]]
Sent: Monday, December 26, 2005 11:10 AM
To: [log in to unmask]
Subject: [TN] Lead Free Compatible Values
Dear Technetter
We have collected RoHS declaration of our copper clad laminate supplier.In
RoHS declaration they assure that their PCBs
do not include or limited six restricted elements Cd, Pb,Hg,Pb, Cr VI,.PBB
and PBDE. With these RoHS
declaration nobody can claim that these CCLs are lead free compatible.Our
customers and directly we have already started
to produce RoHS compatible PCBs. As you know all that RoHS compatible PCBs
do not mean that these PCBs can withstand
high temperature of lead free proccess steps. These PCBs naturally their
CCLs are subjected to higher thermal applications
which can cause some problem during the soldering or assembly such as
expansion, bow and twist blister or delamination. So
to let us decide If any CCL can withstand high temperature or lead free
process we and our customer wants to have
appropriate Tg, TMA, Td and CTE values. These value can help us to determine
whether our CCL raw materials they supply us
are appropriate for high temperatrure lead free proccess or not. In these
view we would appreciate that If you would
issue new declarations in which they assure their CCLs are completely RoHS
compatible and can endure lead free process
temperature at each stage.
To sum up we all need to have the Tg, TMA, Td and CTE values. Do you know
that is there any exact or specified value
which can be used as limititation or what are the minimum value of these
I wish you all merry and happy christmas
Best Regards
--
Yusuf GÖMEÇ
Product Quality Engineer
BASKI DEVRE SAN ve TIC LTD STI
Ceyhan Sk. No:10 34896 Pendik-Istanbul-Turkey
Tel: 00 90 216 3901036 (4 Hat/Line)-173(Extention)
00 90 216 4836560 (4 Hat/Line)-173(Extention)
Fax: 00 90 216 3544941
00 90 216 4913269
Gsm: 00 90 533 6579897
00 90 533 7480014
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