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April 2005

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dehoyos, Ramon
Date:
Wed, 27 Apr 2005 10:12:35 -0400
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         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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