cvermeulen;3684626; said:Garhog - you're correct, two ply tempered laminate is generally sized so that one of the sheets is strong enough, as laminating the two will not make it twice as strong. 1/2" tempered safety glass is more than strong enough for a 36" window, and $750 for a pane that size is a reasonable price, given it's specialty nature.
Having said that, 3/4" plate glass would be similarly effective, and quite reistant to impacts, but not quite as damage resistant as the laminate.
3/4" Polycarbonate sheet might be another possibility for you. It will scratch more easily, but it will have better clarity, and absolutely will not crack, no matter what happens to it.
thanks for the input have be considering all different materials wieghing out the pro and cons and am leaning toward the tempered laminate i think it will has good impact and scratch resistant qualities and decent afordabilty. am curious if anybody has an sugestions on how much clearance i should leave around the edges of glass for expansion. cvermeulen your 600 is awesome btw it convinced to build the filtration into my tank.

