Shall have a density of 12 to 17 pounds per cubic
foot (193 to 273 kg/m3). Material should contain
maximum 5% fines less than 4 mesh (U.S. standard
screen size) (6.35 mm). Must be magnetically sepa-
rated material and free of steel, lead, bottle caps,
plastic cans and other plastics, glass, wood, dirt,
grease, trash, and other foreign substances. Any
free lead is basis for rejection. Any and all alumi-
num items, other than used beverage cans, are not
acceptable. Variations to this specification should
be agreed upon prior to shipment between the seller
and buyer.