The standard size of Coated Duplex Board With Grey Back is 787mm1092mm, the large size is 889mm1194mm, or other specifications or rolls of paper can be produced as stipulated in the purchase contract. White board paper, due to its relatively uniform fiber structure, has fillers and sizing agents on its surface layer, and is coated with a certain amount of paint and undergoes multi-roller calendering treatment. Therefore, the texture of the paperboard is relatively compact and its thickness is relatively uniform. The paper surface is generally white and smooth, with relatively uniform ink absorption. There is less powder shedding and fuzz on the surface. The paper is strong and tough with good folding endurance. However, its moisture content is relatively high, usually around 10%, and it has a certain degree of elasticity, which will have a certain impact on printing. The differences between white board paper and coated paper, offset paper and letterpress paper lie in the paper's heavier grammage, thicker thickness and different colors on the front and back sides. White board paper is gray on one side and white on the other, also known as gray background coated white.