What's 70/30 Brass ?
Brass is any alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties.
(1)In comparison, bronze is principally an alloy of copper and tin.
(2)Despite this distinction some types of brasses are called bronzes and vice-versa.
(3)Brass is a substitutional alloy.
Shall consist of red brass scrap, valves, machinery bearings and other machinery parts, including miscellaneous castings made of copper, tin, zinc, and/or lead.
Shall be free of semi-red brass castings (78%to 81% copper); railroad car boxes and other similar high-lead alloys; cocks and faucets; closed water meters; gates; pot pieces; ingots and burned brass; aluminum, silicon, and manganese bronzes; iron and non-metallics. No piece tomeasure more than 12 over any one part or weigh over 100 lbs.