Procedure for Casting Tubes

The same six steps in the procedure for casting sheet stock can be applied to the casting of membrane on the inside of a porous tube. 

The challenge is to find an inexpensive porous tube which has sufficient strength to withstand 100 psi pressure internally for long periods of time. Porous polyethylene, polypropylene, and fiberglass-reinforced epoxy support tubes have been utilized. 

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