Flip Flops

[dwardio]

Since they are cheap, sacrifice the bottom of one and perform a flame test for Chlorine compounds. I posted some results a while back:

Flame testing foam board, DTFB, EPA foam, & felt pads (Edited)

Based on an earlier discussion regarding the Chlorine-content of DTFB and other paper-backed foam core: I finally got around to flame-testing a number of potentially hazardous materials… But first, the standard disclaimer: This is a hopefully helpful, but non-authoritative post. You should always test all unknown materials before placing them in any sort of laser cutter! Every variety of foamboard / foamcore (DTFB and others) I had sitting around tested clean – yellow flames without a hi…

Here’s a link to the procedure itself:

How To Identify Plastics Before Laser Cutting Them

Dan also posted a very important follow-up:

A word of caution about the chlorine flame test

I’ve seen a number of people refer to this test when determining if products are laser-compatible. I want to share a strong note of caution: there are many potential toxic byproducts of combustion. I believe this video only attempts to test for one. I would not rely on it to determine if a product of unknown composition is laser compatible or not.