[amsat-bb] Space Grade Soldering ?

Hi all,

I've been reading about the construction of a few microsats and I see "Space Grade Soldering" mentioned a few times. So I'm curious as to what that entails ?

I'd guess for starters the solder itself wouldn't be your standard 60/40 rosin cored stuff but I don't know ! and I'd imagine there'd be something do with process too.

Can someone enlighten me or point me at a URL on the matter ?

thanks

Tim