Sand casting greater cost. With a completed mold at the appropriate moisture content, the box containing the sand mold is then positioned for filling with molten metal—typically iron, steel, bronze, brass, aluminium, magnesium alloys, or various pot metal alloys, which often include lead, tin, and zinc. After being filled with liquid metal the box is set aside until the metal is sufficiently cool to be strong. The sand is then removed, revealing a rough casting that, in the case of iron or steel, may still be glowing red. In the case of metals that are significantly heavier than the casting sand, such
Industrial metal later chose to experiment with industrial music. Industrial metal blossomed in the early 1990s, particularly in North America, where it would eventually sell close to 35 million units. It first became a commercial force in 1992 when Nine Inch Nails' "Broken" and Ministry's "" went platinum in America, though the latter took three years to reach that status. Both groups were nominated for the Best Metal Performance in the 1992 Grammy Awards, with Nine Inch Nails winning. Two years later, Nine Inch Nails released "The Downward Spiral", which debuted at No. 2, and would eventually go quadruple-platinum. This record is