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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