You turned me curious, so i made a test on one of the FP goggles i have around (i have 3 or 4 of them, "sparsed" around here and there
) ..... used the border of a side flap, for not ruin the lens, anyway the material and thickness are the same of the front part.
I only have a 190mW focusable green module, at the moment, so cannot test with more power than this, anyway the tests does not look too bad ..... the "macro" pics are from 2mm, 1mm and "burning spot" 0.2mm beams, with 10 seconds of exposition each point.
the 2mm beam started to melt the plastic, but only at the surface (it moved a little bit, for this reason it's oval), the 1mm beam melted like 1/4 of the thickness, larger than its diameter, and the "burning spot" melted more concentrated and a little bit more of half of the thickness (and the reflections was turning half of the room in a lumia wheel effect, LOL), and in all the 3 cases, there was no green light passing through the red plastic (or, better said, i have not seen any green light passing through the plastic and hit the white paper that i've placed after it)
Still they are not professionally rated and certified, perhaps they work good, at least for the green (always must be remembered that they DON'T BLOCK the IR part of a non-IR-filtered green laser)
