A-grade board：
A1- The wood chips are intact without any wood knots
A2- The wood chips are intact, and there are a small number of wood knots with a diameter less than 3cm distributed in two parts of the board
B-level board：
B1- The wood chips are intact and there are wooden knots with a diameter of less than 3cm distributed throughout the surface
B2- The wood chips are intact and there are wooden knots with a diameter greater than 3cm distributed throughout the surface
C-grade board：
Except for bark and A-grade B-grade boards, complete/incomplete wood chips are classified as C-grade boards and are not further classified
About Classification Standards：
Refer to the above for the grading standards of the board. If corporate customers have special requirements for product screening, they can contact the business liaison for further discussion. The contact information is located on the right side of the screen and can be scanned to add enterprise WeChat or LINE.