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Old 03-01-2009, 07:44 PM   #1
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Heat treated glass

I built a 68 gallon tank with 8mm glass and it exploded when I filled it. The seams held and the actual glass broke. Does any one know if heat treated glass is a great option? Or what i need to do to ensure a repeat does not happen?

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Old 03-01-2009, 09:03 PM   #2
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Did you cut that glass to size?
If so, that's why it blew up. Glass is tempered after it's cut and when you cut it, stress lines are broken and the glass breaks. Usually this happens during the cutting, but I have seen tempered glass survive the cutting and blow up later.
If I'm not mistaken, most aquariums have a tempered bottom and untempered sides. I believe it's a safety thing as if there is an accident the side will just crack where if it were safety glass, the whole side would disappear (as you experienced) and there'd be a flood.
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Old 03-01-2009, 10:03 PM   #3
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8mm glass is too thin, I would think. My old 70 gal tank (standard height), with untempered sides, uses almost 1/2" thick glass ~=12mm. My new one is ~10mm.

The actual thickness you need is determined by the height of the tank, the taller tanks need thicker glass, even with less water in it.

This is the tank calculator:
http://www.garf.org/tank/buildtank.asp

You can use tempered glass to reduce the thickness, but that needed to be cut first before tempering, so is really feasible in factories. Plus, you will not be able to cut or drill it at all after the tempering.

Other possibilities would include - the tank not being square, putting extra stress on the glass; a deep scratch that had weaken the glass; or a chipped at the edge that propagated into a crack. <That happened to my old tank. I cut a u-shaped slot for an overflow, and I must have chipped a corner, as a crack propagated from the corner after several months. I should have drilled holes at the corners so the corner was rounded to prevent the stress ..... but that was an old scratched up tank I was playing with .....>
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