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(HMS 1): Wrought iron and/or steel scrap 1⁄4 inch and larger in thickness. All pieces must be smaller than *0x*4 in.

• (HMS 1): Same as ISRI **0 except pieces must be smaller than *6x*8 in.
• (HMS 1): Same as ISRI **0 except pieces must be smaller than *0x*8 in.
• (HMS 2): Wrought iron and/or steel scrap, black and galvanized, 1⁄8 inch and larger in thickness.
• (HMS 2): Same as ISRI **3 except pieces must be smaller than *6x*8 in.
• (HMS 2): Same as ISRI **4 except it may contain automotive scrap except for thin gauge material.
• (HMS 2): Same as ISRI **5 except pieces must be smaller than *0x*8 in.

This density, sizing and preparation makes for efficient furnace operation by mini-mising the time to charge enough scrap for a full melt. In contrast, thin mixed scrap greatly increases charging time, cutting furnace productivity.