SJX Watches
Explained: The Rolex Parachrom Hairspring
Over the last decade, metal alloy hairsprings seem to fallen out of favour across watchmaking, with even conservative, haute horlogerie brands like Breguet and Patek Philippe turning to silicon balance springs. Not to mention large-scale makers of sporty watches like Omega and Tudor, which already transitioned to silicon balance springs. Rolex, however, stands out. The Geneva marque continues to employ a hairspring fabricated of its proprietary blue alloy – the Parachrom hairspring. The Parachrom hairspring inside the cal. 4131 of the Cosmograph Daytona The advantages of alloy The use of blue Parachrom is rooted in the simple fact that the right metal alloy boasts performance that is at least on par with its silicon counterpart – while offering some distinct advantages missing in silicon. Alloy hairsprings are traditionally made of Nivarox (and its family of related alloys), a special alloy that neither oxidises nor change its dimensions with variations in temperature. Invented in 1933 and almost a century old, Nivarox is a mix of nickel and iron, making it a ferromagnetic alloy, thus susceptible to influence from magnetic fields. The cal. 3255 of the Day-Date 40 is equipped with a Parachrom hairspring. Image – Rolex In order to make its hairsprings more resistant to magnetism and to bypass the Swatch-imposed monopoly on Nivarox hairsprings (Nivarox-FAR being one of the key companies of Swatch Group), Rolex set out to develop its own hairspring alloy in the early 2...
