Generally speaking, the structure and filler of cardboard and paper are the same.
Cardboard is also called cardboard. Thick paper made of various pulps and interwoven fibers. The difference between paperboard and paper is usually distinguished by quantity and thickness. Generally, paperboard with a basis weight of more than 200g/m2 and a thickness of more than 0.5mm is called paperboard.
In addition, it is generally considered as paper with a basis weight of less than 225 g/m2 and paperboard with a basis weight of 225 g/m2 or more.