This question is important since if you’re going to be spending money on a product that is superior to others, you’ll want to know why that is. Impact windows and doors contain a special type of glass that is more durable and shatter-resistant. This glass is also secured in heavy-duty frames made of aluminum or other durable metals. Unlike most windows made with one pane of glass, impact windows consist of at least two panes of glass reinforced with a special Polyvinyl Butyral layer. This plastic material will cause any broken glass to stick to this central membrane, preventing the occurrence of shattering or excessive damage to the window. Impact windows are carefully designed to offer the most resistance possible to shattering and breaking.
Haven't had a hurricane or such to test them
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