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Originally Posted by JoelF
Excuse my ignorance, but what is the diff betwen extruded and cast. Cast seems pretty obvious but extruded?
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cast is superior in clarity. extruded has optical flaws in it due to it being extruded out of a mold.
as for strength, they are so close it doesn't really matter for the average person, and for glue-ability they are both good. tank builders use cast because of the clarity of it, and all the skimmer and reactor makers use it because the tank builders do. then they try tell you extruded will fail in 1 year or less and develop crazing. this is just them trying to justify there use of a product that is 4 times more expensive because of the processes used to make it. if you cut and glue extruded properly you will not get crazing.
Steve
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