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Polyester film. We had a jewelry store tenant that had it put on our glass windows and doors. It was guaranteed not to shatter no matter what they hit it with. the tenant saw a demo where they tried to beat a window in with a baseball bat and could not.
Re: window film.
From the ones that I've seen the film just keeps the broken pieces from flyiing into the room, if hit hard enough it won't prevent glass breakage.
The British Army used it in Iraq to prevent the glass from shattering and filling a room with splinters in a blast. It doesn't stop the window breaking but it tends to break in sheets rather than shattering.
I've seen it in action and it tended to work. The protective film does provide a degree of protection to the glass, when applied to both sides of the glass it did increase it's strength over neighbouring windows that had none applied. The treated windows stayed intact when the others broke.
You aren't allowed to advertise down here that it will help protect your windows from harm in hurricanes because it hasn't gone through the '2x4 cannon' test and gotten results acceptable for the Florida Building Code. Probably helps to some degree, but there are more reliable products out there. (Though they'll likely cost a lot more than the film will.)
There are some non-clear fabrics that meet hurricane code. There are also metal shutters of various types including 'roll downs' and certified impact glass windows. Here's an example from a window company that does a lot of business down here:
Ya those would be a good investment, you know how much the cost?
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