Ramon,
Not a nice sight indeed, and smells even worse. But a Z-axis bow of 25 mm of a card with diagonal dimension of ~300 mm is a bit funny. provided, of course, you are neither the clumsy operator (who change the conveyor belt width for the next batch while the last card of the previous one was in the hottest zone) nor the CFO, who hates quality costs.
The board in nailed to the wall in my office - you are invited to watch.
Regards
Ofer Cohen
Manager
Quality Assurance, Reliability and Production Technologies
Seabridge Ltd. - A Siemens Company
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Dehoyos, Ramon
Sent: Wednesday, April 27, 2005 16:13
To: [log in to unmask]
Subject: Re: [TN] Burn temp / FR4
I can only supply empirical info. FR4 will turn into carbon potato chip and starts smoking at 240 C if it falls off the chain and stays in the reflow oven for about 30 min. It might see hotter air when it falls off the chain. It is not a pretty sight
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Gerard O'Brien
Sent: Wednesday, April 27, 2005 9:08 AM
To: [log in to unmask]
Subject: Re: [TN] Burn temp / FR4
"burn" - smolder maybe. By definition its not supposed to support flame. UL
places flame strips directly under a Laboratory burner for a given time
period - see UL 94 for the exact procedure, so the temperature is rather
hot.
Probably of more importance to your customer is the Td of the material which
will be between 300 to 350C depending on the resin system being used. Td is
the temperature at which the bonds start to break down.
Hope this helps
Gerard
-----Original Message-----
From: Robert Coburn [mailto:[log in to unmask]]
Sent: Wednesday, April 27, 2005 7:10 AM
To: [log in to unmask]
Subject: [TN] Burn temp / FR4
Hi T'Netter's;
One of my customers has asked the following:
"would you know the temperature at which FR4 material will begin to burn?"
They're not looking for continuous operation temp, they want to know how
hot must the heat source be for the epoxy resin system to start burning.
TIA.
Regards,
Rob
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