While working on brand x doing some wiring, I took the side wall off. There is no insulation on that side, as the factory "fiberglass type" insulation was removed on that side. I have a roll of similar material, and a hangar neighbor just gave me some cheap feeling 1/4" light foam/foil stuff that he and another guy used. I am not wanting to do an all over insulation job, but merely put something back on that side. Given the choice of the the 2 materials, what is the general as to which may "make a difference"?
In my ignorance, I would think the "fiberglass" would be .....

Thanks

Are they aviation products?

Light a piece on fire and see how fast it burns. We bought a Geronimo that was full of insulation the owner put in to make it quiet. Stuff burnt up so fast. I tried finding the video on my computer but no luck.

Exactly, you don't want anything that won't burn cert and definitely not anything that will put off toxic smoke when on fire.

Thanks, I'll stick to the fiberglass stuff.