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Precious Metals


Pure gold is a very soft and low-resistant metal as it has a hardness of only 30-34 Vickers degrees and a breaking load under traction of about 170 N /mm2. Its combination with other elements enables to obtain alloys with much higher mechanical properties.

The presence of specific metals in small percentages like impurities may negatively affect the mechanical characteristics of the alloy, sometimes making it very fragile and lowering its quality. The most harmful metals are mainly: lead, mercury, bismuth. It is therefore important, when creating dental alloys, to use gold with a high purity degree and free from such elements. Gold is the main component of cast alloys as it gives high resistance to corrosion. In recent years the concepts of bio-compatibility and bio-functionality have acquired great importance for the formulation of a new alloy.

The biocompatibility of gold as metallic element is unquestioned and undisputable. As the most electropositive and thermodynamically stable metal, it is almost corrosion free. This particular property is maintained with dental alloys with a high content of precious metals, both for the nature of the metals and for their combination. Gold has a very high density and so do the alloys containing a high concentration of it. Gold tends to confer to alloys its typical YELLOW color.

8853 S.p.A. sells gold guaranteed not only by the 999,9 (four nines) purity degree, but also for the part related to the impurities contained in the metal as it complies with the limits provided for by ASTM standards.

On request, 8853 S.p.A. can also supply BI-REFINED gold corresponding to the 999,99 (five nines) purity degree.
  • Chemical symbol: Au
  • Specific weight: 19,32 g/cm3
  • Color: gold
  • Hardness: 30 HV
  • Melting temperature: 1063 C