Thanks CoalCracker. For anyone interested, I think that second article still is at best ambiguous regarding what exactly the proposed new panels will be able to withstand. I hope DuPont's and Alcoa's official statements clear that potential ambiguity up; they certainly might, or they may already have done so but those articles may not have cited the relevant comments. And I also hope that consumers look carefully at performance ratings & representations before making decisions about what type of protection to buy for windows, doors, etc.
I believe the only objective test mentioned in that article is "the 'large missile impact test,' involving a 9-pound 2X4 timber traveling at 50 feet per second, as stipulated by the Miami-Dade Building Code."
If my calculations are correct, that is a 9-pound object traveling at approximately 34.09 mph . Impressive, certainly, but 34.09 mph is far from an object traveling 130 mph.
I have no idea how that test translates to how fast a small object would travel if hurled by 130 mph winds, or whether a panel which passes that test would be able to withstand the impact of an object hurled by 130 mph winds.
The other notable comment: "It is a durable architectural panel system designed to withstand wind-borne debris and wind speeds common in hurricanes up to a Category 3 storm. (Category 3 hurricanes have wind speeds up to 130 mph.)" That's pretty vague about what speed of debris it's designed to protect against. The article does not state that it will protect against objects traveling up to 130 mph, or even that it is designed to protect against winds (let alone debris) at the high-end of Cat 3, only that it is designed to protect against debris and wind speeds "common" in Cat 3 storms. "Common" could mean a lot of things. Again, I hope that has been cleared up or will be cleared up before consumers make important decisions about what protection to buy.
Edited by Brad in Miami (Thu Jun 08 2006 04:41 PM)
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