These will melt - metal zip tags and belt buckles

Metal zipper tags and belt buckles melt very easily and can be melted by heating it in the stove for 5 minutes. But other metals like aluminium refuse to melt even after hours.

If you leave it overnight, it dissolves pretty well in vinegar. I am sure they are made of metal, as I've melted it and cast some metal cookies. The metal is denser than aluminium, shiny when molten and cast, but surface tarnishes after 1-2 hours. I'm guessing it is some type of a zinc alloy.

The metal of the zip tag has the following characterisitics:

  • silvery
  • tarnishes into a dark gray
  • does not colour a flame in odd colours (like red , crimson , green etc.)
  • malleable (easy to bend a 5 mm thick square just by using leverage of hands and a surface to press down on)
  • brittle if bent a couple of times.
  • melts in a few minutes

So, what alloy or metal are they made of?

  • 3
    $\begingroup$ Then consider the possibility that they are not made of metal at all, despite the appearance. $\endgroup$ May 8, 2018 at 4:35
  • $\begingroup$ they are metal , I've melted it and cast some metal cookies $\endgroup$ May 8, 2018 at 4:49
  • $\begingroup$ the metal is denser than aluminium , shiny when molten and cast but surface tarnishes after 1-2 hours. I'm guessing some type of zinc alloy $\endgroup$ May 8, 2018 at 4:54
  • 2
    $\begingroup$ Well, then you might be right. Have you tried to dissolve it in an acid or something? $\endgroup$ May 8, 2018 at 5:57
  • 1
    $\begingroup$ Possibly Woods Metal which is one of several low melting point alloys, see Wikipedia. $\endgroup$
    – porphyrin
    May 9, 2018 at 10:00


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