Duplex board with grey back is commonly known as gray-backed white, and also has white-backed board. It is white and smooth on the front and mostly gray on the back. It is called gray-backed white. White on white means that the front and back are both white and smooth, but the paper core is grey. This kind of cardboard is mainly used for color box printing in the packaging industry and is single-sided printing.

Stiffness and Durability: It possesses higher stiffness, which allows it to maintain its shape and structural integrity even under pressure or weight. This makes it suitable for packaging applications that require strength and support.

Smooth Surface: The board has a smooth surface on the front side, providing a high-quality printing substrate. This smoothness ensures that the printed designs appear sharp and vibrant.

Flat and Neat Appearance: The board has a flat surface, contributing to a tidy and professional look for the final packaging product. It enhances the overall visual appeal and presentation.