Td will indicate at what temperature you will loss 5% of your laminate.
This is about where the board will begin to char. You obviously want to
pick a Td temperature well above the maximum in your reflow profile
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Joe Lee
Sent: Monday, August 09, 2004 2:58 PM
To: [log in to unmask]
Subject: Re: [LF] Tg material
To all:
Is Td an non-issue for PCBA assembly?
When would a PCB be subjected to Td temperatures and for any significant
time to cause damage or loss?
Is Td more for flame retardent rating?
How is the laminate lost? Does it burn? Melt? ???
Joe
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Lee Parker
Sent: Monday, August 09, 2004 2:42 PM
To: [log in to unmask]
Subject: Re: [LF] Tg material
Victor
If you loss 5% of the laminate during assembly it will obviously be a
disaster. This can be prevented by selecting a material that has a Td
high
enough to be compatible with your assembly environment.
Best regards
Lee
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Monday, August 09, 2004 12:05 PM
To: [log in to unmask]; [log in to unmask]
Cc: [log in to unmask]
Subject: RE: [LF] Tg material
Lee,
How will the Td 5% weight loss effect the integrity of the laminate.
Victor,
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Lee Parker
Sent: Monday, August 09, 2004 10:58 AM
To: [log in to unmask]
Subject: Re: [LF] Tg material
Pascal
Td is the temperature that will cause a 5% weight loss in the material
Best regards
Lee
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Pascal Guiheneuf
Sent: Monday, August 09, 2004 9:38 AM
To: [log in to unmask]
Subject: Re: [LF] Tg material
Joe,
Td for PCB is thermal decomposition temperature (generally >320°C). Is
anyone able to give a complete definition ? Merci,
Pascal
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Lee, Joe
[CAR:CP12:EXCH]
Sent: lundi 9 août 2004 14:43
To: [log in to unmask]
Subject: Re: [LF] Tg material
Lee:
What is Td materials?
Joe
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Lee Parker
Sent: Saturday, August 07, 2004 11:31 AM
To: [log in to unmask]
Subject: Re: [LF] Tg material
John
Accounts are moving to both high Tg and Td materials to accommodate the
higher assembly temperatures.
Best regards
Lee
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of John Foster
Sent: Friday, August 06, 2004 8:15 PM
To: [log in to unmask]
Subject: [LF] Tg material
I am curious if people have been automatically moving to higher Tg
laminates
to support lead free.
Any input would be appreciated
Thank You.
We are just starting down the lead free path and this forum has been a
great
help.
Thanks again
John Foster
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