GMA pallet grades aren't necessary for plastic pallets.

GMA Pallet Grades: How and Why Are Pallets Graded?

The Second World War revolutionized supply technology. The Allies created a global supply chain to keep their armies around the world stocked with food, ammunition, and machinery. The wood pallet—at the time a revolutionary concept in a 48”x48” square—carried most of these goods to battlefronts around the world. After the war, the revolutionary pallet concept…