Shall consist of miscellaneous old zinc base die castings,
with or without iron and other foreign attachments.
Must be free of borings, turnings, dross
pieces, chunks, melted pieces and skimmings. All
unmeltables, dirt, foreign attachments, and volatile
substances (such as rubber, cork, plastic, grease,
etc.) are deductible. Material containing in excess of
30% iron will not constitute good delivery.
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