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Interior liner

Interior liner

Interior liner

(OP)
Hi,
In water Treatment plant, DAF Process. Inside of two chemical rooms specified UPVC liner(Type1 Grade1). One room has Sodium Hypochlorite and other has PAC(Ploy Aluminum chloride). We have suggestion round the table meeting to use HDPE liner (it also called as PUCK board).
My question is
Which has better for chemical resistance?
Which has less tendency of expands?

Thanks

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