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regarding weight savings, per that webiste...
Weight savings - Using LEXANŽ carries a substantial weight savings over the use of ordinary glass. For example, a 1/4" thick square foot of LEXANŽ weighs 1.56 lbs. in comparison to 3.2 lbs. of glass. Another consideration is that further weight savings can be obtained because a lesser thickness of LEXANŽ may be used. (An 1/8" window may be used replacing a 3/16" thick glass application).
so assume half the weight in general.
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