Grey pulp board, also known as grey chipboard or grey cardboard, is a type of thick paperboard that is widely used in packaging and industrial applications. It is characterized by its grey color and substantial thickness, which gives it strength and durability. The production process of grey pulp board involves compressing layers of recycled paper pulp together with a binding agent, usually a starch-based adhesive. This creates a dense and rigid material that can withstand bending, folding, and stacking without losing its structural integrity. The grey color of the board is often achieved by using unbleached or partially bleached recycled paper fibers, giving it a natural and earthy appearance.