HMS 1&2 80/20 Chemical composition shall fully be ISRI (Institure of Scrap Recycling Industries) compliant 200, 201,202,203,204,205,206. ISRI CODES: 200-206 Scrap metal HMS 1+2: physical composition 200 No. 1 heavy melting steel. ........Wrought iron and/or steel scrap 1/4 inch and over in thickness. Individual pieces not over 60 x 24 inches (charging box size) prepared in a manner to insure compact charging.201 No. 1 heavy melting steel .............3 feet x 18 inches. Wrought iron and/or steel scrap 1/4 inch and over in thickness. Individual pieces not over 36 inches x 18 inches (charging box size) prepared in a manner to insure compact charging. ISRI 202 No. 1 heavy melting steel 5 feet x 18202 No. 1 heavy melting steel................. 5 feet x 18 inches. Wrought iron and/or steel scrap 1/4 inch and over in thickness. Individual pieces not over 60 inches x 18 inches (charging box size) prepared in a manner to insure compact charging.203 No. 2 heavy melting steel. .................Wrought iron and steel scrap, black and galvanized, 1/8 inch and over in thickness, charging box size to include material not suitable as No. 1 heavy melting steel. Prepared in a manner to insure compact charging.204 No. 2 heavy melting steel........................Wrought iron and steel scrap, black and galvanized, maximum size 36 x 18 inches. May include all automobile scrap properly prepared.205 No. 2 heavy melting steel ................3 feet x 18 inches. Wrought iron and steel scrap, black and galvanized, maximum size 36 x 18 inches. May include automobile scrap, properly prepared, however, to be free of sheet iron or thin gauged material.206No. 2 heavy melting steel................. 5 feet x 18 inches. Wrought iron and steel scrap, black and galvanized, maximum size 60 x 18 inches. May include automobile scrap, properly prepared, however, to be free of sheet iron or thin gauged material. Note: Free from concrete, dirt, and foreign material of any kind