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What’s the difference between General Purpose and Interior Wet Area?

The General Purpose panels are made from MR (Moisture Resistant) MDF and the Interior Wet Area panels are made from UHMR (Ultra High Moisture Resistant) MDF.

The Interior Wet Area is an UHMR MDF substrate held together using a Polyurethane based resin, that provides an extremely strong bond to the wood particles, forming a non-reversable chemical weld. Unlike traditional Urea Resins used in MR MDF, the Polyurethane resin does not break down gradually over time in the presence of frequent moisture.