Which low temperature (< 350°C) solder can be used to solder a ring? So non toxic in direct constant contact with skin and overall in domestic environment?


closed as off-topic by Leon Heller, The Photon, user3624, JIm Dearden, JYelton Aug 2 '13 at 20:45

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  • 1
    \$\begingroup\$ What is the ring made of? \$\endgroup\$ – Justin Aug 2 '13 at 18:50
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    \$\begingroup\$ This question appears to be off-topic because it is not about electronic design. \$\endgroup\$ – Leon Heller Aug 2 '13 at 19:19
  • \$\begingroup\$ @Justin: Cu or Ag \$\endgroup\$ – tig Aug 3 '13 at 2:49

Au/Sn solder should do it. Available at http://www.indium.com/products/

The eutectic point is 536 deg F, or 280 deg C. I can't vouch for the biocompatibility for permanent skin contact. The best source for that would likely be with the compliance officer for whatever standard you're trying to hit, or maybe a phone call to the Indium Corporation.


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