What is the stack-up?  How thick is the Al and FR4?  Is it single or double
sided?  How large is the PCB?

We routinely convection reflow solder small (1"x3.5") single-sided Berquist
T-clad PCBs with no issues.  But, we are not using LF.

http://www.bergquistcompany.com/ts_thermal_clad.cfm

I believe the metal substrate would only assist in temperature stabilization
in the soak zone.  For a larger PCB or thicker metal substrate, the devil is
in the profiling, particularly in ramping and cooling.

Interesting that Werner states vapor phase is the only way.  How would this
differ from a metal core PCB?  Are there not yet any RoHS compliant metal
core PCBs?

Kevin Glidden
Manufacturing Engineer
Luminescent Systems Inc.



-----Original Message-----
From: P. Langeveld [mailto:[log in to unmask]] 
Sent: Wednesday, January 02, 2008 10:58 AM
To: [log in to unmask]
Subject: [TN] reflow soldering metal backed pcb

Happy New Year and good health for all !!

Is there any who has experience with reflow soldering metal backed pcb's?
The metal is aluminium, the insulation is FR4, the solder is lead free.

I am looking for a process window.

Regards,

Peer Langeveld
Consultant Soft Soldering
5502 VH8
The Netherlands

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------