The Planted Tank Forum - View Single Post - Acrylic brackets
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post #10 of (permalink) Old 03-07-2013, 11:51 AM
DKShrimporium
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Join Date: Nov 2004
Location: PA/MD/DE tristate area
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Acrylic plastic has a molecular structure that takes up moisture, so on the side that is exposed to humidity, you get swelling and bowing.

Polycarbonate (Lexan brand is an example) is a different molecular structure that does not do this much.

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