This part of ISO 10081 specifies the classification and designation of dense shaped basic refractory products with or without antioxidant additives. Products containing 7 % or more residual carbon after coking are excluded from this classification. The classification is applicable to dense shaped products with or without metal plates and reinforcement. NOTE 1 ISO 10081-3 covers the classification of dense shaped basic products containing from 7 % to 50 % residual carbon. NOTE 2 All bricks can be encased in metal plate and all unfired bricks can be reinforced by means of an internal metal plate, and/or mixed metal fibre.