PVC and XPVC are different. PVC is solid plastic. XPVC has tiny air cells in it like a solid scuba diver suit? Just trying to give a mental picture. My racks complete weight right around 40lbs. I can pick it up easily and move it around. I use 1/2" for my racks which is plenty thick enough. My rack uses one sheet and I know that a sheet of melamine weighs a lot more than 40lbs. I would guess at least double but probably more.
Regards,
B
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