Hi Dave,
You are correct that FR-4 casts a wide net. U.L. has broken this group
into subcategories now. I am not aware of anyone trying to categorize
paper phenolic into the FR-4 category.
Back to the flame retardant type. I believe the vast majority of the
resin systems that contain a flame retardant contain TBBPA which is not
a RoHS target. I am not aware of any laminate that contained targeted
material. I think it is important to know for sure, but my understanding
is that TBBPA has excellent flame retardant properties and low cost. My
assumption is that the targeted materials (PBE, 5-8 PBDE) have a higher
cost relative to TBBPA so there would have been years of incentive not
to have them in laminate. Thus I made the sweeping statement. Maybe
too sweeping, and it is probably a good idea to check with your laminate
supplier, but I haven't had anyone tell me what laminates actually have
a BFR problem.
Dave
David W. Bergman, CAE
Vice President, Standards, Technology and International Relations
IPC
3000 Lakeside Drive # 309S
Bannockburn, IL 60015
Phone 847-597-2840 Fax 847-615-5640
Mobile 847-867-1388
Main 847-615-7100
email [log in to unmask] www.ipc.org
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of MA/NY DDave
Sent: Wednesday, February 23, 2005 1:26 PM
To: [log in to unmask]
Subject: Re: [LF] RoHS compliance PCB
Hi IPC's DavidB, Chris, Werner, IPC LF Listservers,
I am still following this note series, as I hope you are and wanted to
comment on a portion of your note.
<All FR-4 laminates are RoHS compliant. The flame retardant used in
FR-4 is not a prohibited chemical under RoHS. This is a common
misunderstanding.>
As I think about what I have seen, the new laminates that are being used
in the Lead Free arena are not in all cases true FR-4, FR-5, G-10, G-11
etc.
Different adhesives are being used is only one example.
What has happened is that FR-4 has become a generic name misused for an
Adhesive-Glass laminate structure and sometimes is even used for the
Phenolic-Paper laminates.
Yours in Engineering, Dave
Y i Engr, MA/NY DDave
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