Melting temperatures

The melting temperature of a metal is the point at which it transitions from solid to liquid state. Pure gold melts at 1064°C, pure silver at 961°C, and platinum at 1768°C. Alloys melt at temperatures different from their pure components — a phenomenon known as 'melting point depression' caused by eutectics.

In Swiss jewellery production, the most common alloys are: 750‰ yellow gold (910–950°C), 750‰ palladium white gold (1060–1100°C), 750‰ rose gold (905–930°C), 925‰ sterling silver (893°C). Knowing these temperatures is crucial for choosing the appropriate solder (the solder must melt before the main alloy) and preventing thermal accidents.

Workshop safety during smelting requires proper equipment: graphite or high-temperature ceramic crucibles, heat-resistant gloves (Kevlar type), IR protective goggles, and adequate ventilation to evacuate metallic fumes. Professional casters use an optical pyrometer to precisely measure bath temperature, as exceeding by 50°C can cause excessive oxidation and significant metal loss.