Brass melting point of brass (, depending on composition) and its flow characteristics make it a relatively easy material to cast. By varying the proportions of copper and zinc, the properties of the brass can be changed, allowing hard and soft brasses. The density of brass is . Today, almost 90% of all brass alloys are recycled. Because brass is not ferromagnetic, it can be separated from ferrous scrap by passing the scrap near a powerful magnet. Brass scrap is collected and transported to the foundry where it is melted and recast into billets. Billets are heated and extruded into the
Industrial metal with the success of groups such as Nine Inch Nails. The industrial metal movement began to fade in the latter half of the 1990s. Though electric guitars had been used by industrial artists since the early days of the genre, archetypal industrial groups such as Throbbing Gristle displayed a strong anti-rock stance. British post-punk band Killing Joke pioneered the crossing over between styles, and was an influence on major acts associated with industrial metal such as Ministry, Godflesh, and Nine Inch Nails. Another pioneer industrial rock group, Big Black, also impacted some later groups. By the late 1980s industrial and