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The Rolex Dynapulse is a high-performance silicon hairspring developed by Rolex and introduced in their Calibre 3255 (powering the Day-Date 40 and Datejust 41). Made from silicon using LIGA microfabrication techniques, the Dynapulse hairspring is intrinsically non-magnetic, antimagnetic without a Faraday cage, and provides exceptional stability across temperature variations.
The Dynapulse hairspring's silicon material has a very low coefficient of thermal expansion, meaning it maintains consistent elasticity across temperatures where traditional metal hairsprings would change frequency. Combined with Rolex's free-sprung Parachrom balance wheel system in the Calibre 3255, the Dynapulse contributes to the movement's ±2 seconds per day precision—far exceeding the COSC chronometer standard of ±4-6 seconds.
Both are Rolex silicon hairsprings, but they're used in different calibres and have slightly different designs. The Syloxi hairspring is used in the Calibre 2236 (ladies' movements), while the Dynapulse appears in high-end men's calibres like the 3255. Both are fundamentally silicon-based and offer the same core advantages of non-magnetism and thermal stability, but are optimized for their respective movement architectures and specifications.
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