Richard, the liquidus temperature is the maximum temperature at which solid crystals can co-exist with liquid. Above the liquidus the material is completely liquid. The solidus temperature is in contrast the temperature below which liquid can't exist. In terms of a tin/lead phase diagram it is the upper boundary of the liquid+solid "mushy" region

Regards
Ian

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: 05 April 2012 14:32
To: [log in to unmask]
Subject: Re: [TN] Max time above liquidus

You mean time above solidus. Time above liquidus is vapor. 
Yes, 105 degrees in liquidus does seem excessive, but it depends on the size/mass of the CCA being soldered. It might be required for very large CCAs.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Fabien Guizelin
Sent: Wednesday, April 04, 2012 6:04 PM
To: [log in to unmask]
Subject: [TN] Max time above liquidus

Hi,
Should I be concerned by excessive TAL ?   (inter-metalic, etc)
Do you consider 105sec TAL with a Indium 5.1 paste excessive ?   (Indium recommends 45-60sec)
Thanks,
Fabien



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