I had a 6 foot sliding glass door go bad and decided I would break it. I needed some gravel under a concrete slab anyway. I hit it with a 16 ounce hammer. It bounced off so I hit it harder, bounced off again. This time I hit it as hard as I could and finally broke one piece of glass. I finally broke the second glass by holding the hammer with both hands after several tries. This was when I was fourty or so and in good shape. This glass is tough.
Lynwood
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