Stiff board paper, also known simply as stiff board or stiff paperboard, is a type of paperboard characterized by its rigidity and strength. This material is engineered to have enhanced stiffness compared to standard paper, making it suitable for applications where a robust and rigid substrate is required. Stiff board paper typically consists of multiple layers of paper fibers that are compressed and bonded together under high pressure. The manufacturing process may involve adding additives or coatings to improve stiffness and durability further.