Silicon Balance Springs
The 2006 Spiromax balance spring (Patek Philippe), 2008 Silinvar (the same material commercialised across Patek), and Rolex's Syloxi spring (2014) all originate in a joint research programme with the CSEM (Centre Suisse d'Électronique et de Microtechnique). The material is grown via deep reactive-ion etching, producing springs with geometric precision unattainable in metal.
Properties
Silicon is non-magnetic (eliminating one of the most common causes of rate disturbance), thermally compensated through a silicon-dioxide coating, and dimensionally stable across temperature. The material is also significantly lighter than steel, which reduces inertia at the balance.
Adoption
Now standard or optional across Omega's Master Chronometer movements, Rolex's 32xx calibres, Patek Philippe (most production movements since the late 2000s), and most Swatch Group brands using Powermatic-80 or higher movements. Independent makers including Ulysse Nardin (which co-developed early silicon escapements) and H. Moser & Cie. also use silicon regulating organs.
Key facts
- ▸Joint Patek/Rolex/Swatch Group/CSEM development.
- ▸Non-magnetic, thermally compensated, dimensionally precise.
- ▸Standard on most Omega Master Chronometer and Rolex 32xx movements.