Amalgam (dentistry) packs the plastic mass, before it sets, into the cavity. The amalgam expands ≈0.1% over 6–8 hours on setting. The final structure is a metal matrix composite, where γ, η and γ phases, are a matrix for unreacted original alloy, minus the fast-reacting β-phase and excess Sn. Amalgam is a mixture of two or more metals (alloy) with mercury which has been purified first by distillation to remove impurities. Currently, major components of the alloy are silver tin and copper. The composition of the alloy powder is controlled by ISO standard for dental amalgam alloy (ISO 1559) to control the
Amalgam Digital in hip hop music and distribution. In an April 2008 issue, "The Source" proclaimed that Amalgam Digital has "its finger on the pulse of hip-hop's future." Based in East Boston, the Amalgam Digital label is distributed exclusively by Amalgam Entertainment LLC, a distribution company that offers management, marketing, and promotional services. As an independent label, Amalgam Digital been home to such artists as Max B, Saigon, Curren$y, Chuuwee, Joe Budden, Peedi Crakk, Tash, Kurious, Juggaknots, Tame One, and Lil B. Joe Budden's album released by the label, "Padded Room", reached #42 in the "Billboard" 200 chart and #21 in the