Heavy metals only mercury, lead and bismuth meet all of them. Despite this lack of agreement, the term (plural or singular) is widely used in science. A density of more than 5 g/cm is sometimes quoted as a commonly used criterion and is used in the body of this article. The earliest known metals—common metals such as iron, copper, and tin, and precious metals such as silver, gold, and platinum—are heavy metals. From 1809 onwards, light metals, such as magnesium, aluminium, and titanium, were discovered, as well as less well-known heavy metals including gallium, thallium, and hafnium. Some heavy metals are either
Metals Service Center Institute Metals Service Center Institute The Metals Service Center Institute (MSCI) is a trade association and nonprofit organization based in Rolling Meadows, Illinois, in the United States. It was established as the American Horseshoe and Heavy Hardware Association in 1909 and was subsequently known as the American Steel Warehouse Association, then the Steel Service Center Institute. The organization's members are primarily metal service centers that inventory and distribute metals for industrial customers and perform first-stage processing. MSCI has approximately 400 members operating from 1,500 locations primarily in North America. MSCI members purchase about 75 million tons of steel, aluminum and other