As the name indicates, this type of plywood is meant for marine applications i.e. where flowing water or excessive exposure to water is there. Technically, this is called BWP (Boiling Water Proof) plywood. In trade circles, this is also called 710 plywood, named so after the IS standards for this type of plywood (BIS 710). This is the true water-proof plywood and is made using water-proof phenolic resins. For home and office purposes, this type of plywood is rarely used, as these to be the most expensive as well.