“A “goes for high quality and available to use, can be flawless or contains slightly a few dots, assuming can be replaced by (padding boats or football shape) or repaired and comprehensive patched. This grade may contain repair and comprehensive filler surface split occasionally Always spread sand and provide smooth surface paintable face quality
“B” fits for the second quality level of the surface of the veneer which Is usually considered to be the lower levels of A quality surface trim by-products Solid surface,
Never the less it may contain small diameter narrow surface split demerits. Usually can be repaired and wooden plug or comprehensive filler Usually used to spread sand to keep surface smooth.
“C” is thought to be the low level quality of end face, but a reasonable choice for general construction plan to include tight junction consists of 1 inch diameter of some kind of open hole section Few faces division and color change decision Some manufacture may repair defects with comprehensive filler The floor panel is no typical on sand.
“D” goes for the lowest level of veneer surface or the back plywood surface commonly used for the construction and buildings.Considering several knot, big and small, and open up to 2 inches in diameter and open node splitting and color change is the acceptable level of D surface trim without being repaired without sand This level is not for permanent exposure of weather elements with recommended plywood is divided into ordinary plywood according to the use and special plywood ordinary plywood refers to adapt to the extensive use of plywood; professional plywood means can meet the special use of the plywood.