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<p>[QUOTE=&quot;Kentucky, post: 8387640, member: 33176&quot;]The main thing you want to be wary of is PVC which contains the element Chlorine.&nbsp; As a chemist, the way I always tested for chlorine was the Beilstein Test.&nbsp; You can trim an edge of one of your 2x2&#039;s or just sacrifice one.&nbsp; Heat a copper wire in a flame (butane lighter?) to burn off any residue, then touch the hot copper wire to the plastic to be tested.&nbsp; Return the wire to the flame and look for a green color which would indicate chlorine.[/QUOTE]</p><p><br /></p>

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