Ron,

I don't know if this will help you but if the PCB vendor is UL certified the
laminate will have both a max operating temperature, usually between 100-130
deg C for FR-4 and also carry a UL-94 flame rating
(http://www.ul.com/plastics/flame.html) typically 94V-0.

John Parsons

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Scott,
Ron
Sent: Thursday, December 08, 2005 3:07 PM
To: [log in to unmask]
Subject: [DC] Flammability of FR4

All,

I have a customer that is having an isuue with their boards bursting
into flame when using one of our devices. Our device comes in two
flavors, TQFP & QFN. The QFN is the device that ignites the board. My
question is: Does FR4 have a flash point? I'm quite familiar with Tg
ratings but I haven't heard about a flash point. Is there such a thing?
If so, where can I find information? Manufacturer will not reveal board
material to me.

Cheers,

Ron Scott C.I.D.
Texas Instruments
Storage Products Group
Tel: 214.567.4715
Cell: 972.816.7978
Fax: 972.761.5070
[log in to unmask]

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