I recently tried out a lead-free solder with a 0.20 diameter from the Industrial Power & Hand Tools category and I must say I am impressed! As my tests showed, this solder is perfect for industrial and scientific use .It melts quickly and has a low risk of oxidation, producing a solid bond. However, the downside is that it MAY not be ideal for smaller intricate projects. Overall, i highly recommend this solder for all your industrial and scientific needs..