Plexiglass (a brand name) and various other transparent plastic materials sold under names such as Acrylic sheets, acrylite, lucite, lexan and polycarbonate (not all the same, mind you) should be installed with hinges (if a door) or screwed to a frame (predrill and countersink holes in the plastic). Although much stronger, given equal thickness, than glass, the plastic is much more flexible. If you install it in the standard glass sliding tracks, it could be flexed outwards enough for it to pop out of the tracks. Also, the point where the two sliding pieces meet is difficult to secure, due to the flex in the materials. Actually, this can be a problem even with glass. We once had a boa escape by squeezing between two sliding glass panels. The panels were quite tall (~40") and there was enough flex in the 1/4" glass for it to escape without breaking the glass.
Speaking of glass, tempered is much better than regular float glass. It is stronger as well as safer. Remember that once tempered, the glass can't be cut, drilled, etc. Best of all is two layers of tempered laminated together (or 3 layers, etc.), but this gets expensive! 1/4" (float or tempered) is strong enough to hold most snakes, but large constrictors potentially could break 1/4" tempered.
Jeff Hathaway
Sciensational Sssnakes!!
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