This document describes the quality grades for sorted polystyrene (PS) waste streams as well as specific test methods laying out those properties for which the supplying party of the waste makes information available to the receiving party. PS waste quality grades are based on pre-determined sets of characteristics, taking into account sectorial and market specificities and related information needs and tests methods. The scheme provides for a division of information between Required Data , where a statement is required, and additional Optional Data as agreed between the supplying and receiving party. This document does not cover the general characterization addressed in EN 15347-1.