Electronics > Beginners
Unleaded high temp solder in HORRIBLE
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lordvader88:
Just de-soldering a big heat sink with 5 diodes on it, must be the really high temp solder over 350C. My little 40W station can barely keep up at "400C" maxium, and the solder wick keeps getting stuck.

I've added lots of 60/40 do dilute it, and remove it a bit at a time. I'm almost done.

Not fun, now it start prying it out without breaking more traces
Brumby:
Doesn't need to be high temperature solder ... it can simply be heat loss through that big heatsink - and your 40W iron would be having a hard time of it.  Just because you might have a temperature display for the iron that says 400ÂșC doesn't mean the solder joint is getting that hot at all.

Adding extra solder could simply have provided better heat transfer between the iron and the joint.  It is a common technique for all sorts of joint desoldering.
wraper:
Lead free solders used for electronics usually have melting point in 217-227oC range. 40W is quiet weak to desolder heatsinks. Keep in mind that what is shown on display in not nearly close to the actual temperature at solder joint, especially if you use sorts of hakko clones and tip not big enough.
Tomorokoshi:
Get a pistol grip "old style" soldering iron. I use a 75 one to desolder surface-mount D2PAK, and it's actually a bit slow for that.
lordvader88:
Yeah I have a 100W weller, but I got, and a lot easier/cleaner than the 1st 2 HSsinks
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