... ', or brazing.Lead-free solders in commercial use may contain tin, copper, silver, bismuth, indium, zinc, antimony, and ... 37. The first number always represents the tin content; the higher the tin content, the lower the melting point. ... the joint in one pass. If you choose too large, excess heat may damage your components, or you ... so that you don’t forget. 10PCS/box lead free alloy Sn -52In solder alloy