Section 10 Pulp of wood or of other fibrous cellulosic material;"Recovered (waste and scrap) paper or paperboard; paper and paperboard and articles thereof 48 Paper or paperboard; articles of paper pulp, of paper or paperboard 48 12 Filter blocks, slabs and plates, of paper pulp Commodity Code Description 48 12 00 Filter blocks, slabs and plates, of paper pulp