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MadMax · July 26th, 2007, 01:52

Plastics tend to degrade with age. It's quite possible that the lenses on your gas mask are not polycarbonate (PC) as PC is very prone to embrittlement when exposed to oils and many chemicals. A gas mask wouldn't be much good if the lenses went to shit due to chemical exposure, so it's possible that the lenses are a chemical resistant plastic that is not particularly impact resistant.

When you shot your mask lenses, was the mask strapped to a manniquin head? If it was loosely hanging, the mask may have been allowed to recoil from the impact of the pellet which absorbs some impact energy. Also, your testing procedure is probably not very rigorous in assuring that many angles of impact are tested against. Did you shoot with a calibrated rifle?

Leave ballistic testing to ASTM laboratories when it comes to eyewear.

July 26th, 2007, 01:52	#11
MadMax Delierious Designer of Dastardly Detonations Trader rating Join Date: Dec 2001 Location: in the dark recesses of some metal chip filled machine shop	Plastics tend to degrade with age. It's quite possible that the lenses on your gas mask are not polycarbonate (PC) as PC is very prone to embrittlement when exposed to oils and many chemicals. A gas mask wouldn't be much good if the lenses went to shit due to chemical exposure, so it's possible that the lenses are a chemical resistant plastic that is not particularly impact resistant. When you shot your mask lenses, was the mask strapped to a manniquin head? If it was loosely hanging, the mask may have been allowed to recoil from the impact of the pellet which absorbs some impact energy. Also, your testing procedure is probably not very rigorous in assuring that many angles of impact are tested against. Did you shoot with a calibrated rifle? Leave ballistic testing to ASTM laboratories when it comes to eyewear. __________________ Want nearly free GBB gas?