WATER RESISTANCE
The water resistance of a watch refers to its ability to resist the infiltration of water, dust and moisture likely to damage the movement and alter the lubrication oils. It is ensured by Nitrile or silicone O-rings placed at each entry point: around the crystal, in the crown tube and at the gasket / seal of the case back, whether screwed or snapped on.
The water resistance rating, expressed in ATM or in meters (ISO 22810), corresponds to the maximum pressure tolerated during static immersion tests. A watch described as 10 ATM is not necessarily suitable for diving: dynamic shocks during a dive create pressures far greater than static pressure.
Diving watches certified to ISO 6425 undergo much stricter tests including resistance to shocks and pressure variations. Periodic maintenance of the gaskets/seals is essential to maintain water resistance over time, as rubber ages and loses its properties after a few years of use.
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