Shall consist of miscellaneous old zinc base
diecastings, 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