FourT6and2
Well-known member
What’s the reason for 63/37? I’ve only used 60/40 and sometimes have to use ROHS compliant if the products are going to Europe and I am horrible with it compared to 60/40
60/40 solidifies over a range of temperatures. That means as it transitions from liquid to solid, it goes through a plastic state where it's kind of pasty and slushy. If you disturb the joint during this transition, you get a bad (cold) joint. 63/37 is eutectic, which means it both melts and freezes at one specific temperature. Therefore, it sets and transitions much more quickly and all at once. That means fewer cold joints. It also means lower heat is needed, which is better for sensitive components.
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