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Old 4th November 2008
Lives for gear
Weasel9992's Avatar

Originally Posted by dykstraster@gmai View Post
Sorry John, I missed the post above. The answer is pretty simple, actually: the plastic is just a whole lot thinner and its structure is such that it transfers enough energy to the rigid fiberglass/mineral wool to be useful rather than detrimental. Comparing the two from a physics standpoint is apples and oranges.

Make sense?