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I leapt at Prodex since it attenuates sound while the foil-bubble-foil is pretty much transparent to sound.
The double-bubble style foil hasn't been described other than double layer - is it twice the thickness of the Prodex or is it just the construction to achieve two shiny sides with the bubbles keying together?
The foil-bubble has a smoother surface & is 'shinier' than the Prodex so when new it does reflect heat transfer better than the crinkly duller Prodex but that will be reduced quickly if/when dust or condensation dregs appear on it.
I am looking forward to your next tests; hope you rig the heat panel tests with multiple installations of each type ie: air gap at outer shell or applied on shell with second layer gapped 1/2-inch etc... Oh, and thanks again for sharing.. .
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