Marine ply is superior plywood used in construction. Marine ply is made of layers of wood veneer, holds glue and veneer fasten together.The marine ply layer would be laid one with grain and another against grain, normally the layers are opp number to reach a best stable product.
A major character of marine ply is moisture resistance. The quality of marine plywood depends on the number of plies and the glue quality of ply.
Normally in China, marine ply can be produced by 4x8 feet, also there is some few with 4x6 feet.