Luxury for the luxury watch

Swiss luxury watches are works of art that call for protection. A new coating combines scratch resistance with anti-reflective properties while ensuring the distinct residual color reflection that makes each watch brand unique.

Swiss luxury watches are works of art that call for protection. A new coating combines scratch resistance with anti-reflective properties while ensuring the distinct residual color reflection that makes each watch brand unique.

Watch enthusiasts will look at their high-quality dials many times a day. When it comes to protecting the dial of a luxury watch from the challenges of everyday life, sapphire is the protective cover material of choice. As a transparent and colorless, flat disc, it can preserve the flawlessness of a watch for many years – thanks, but not least, to its outstanding hardness, which is close to that of a diamond.

Challenge

Sapphire: Industry standard with weaknesses

Yet sapphire is not completely immune to scratches and chips, and the material reflects twice as much as glass. To meet the extraordinarily high demands of the luxury watch industry, a highly specialized industry has been developing sapphire coatings for decades that reduce scratches to a minimum. However, additional coatings are neccesary which not only reduce the reflection but also create the characteristic residual color that is typical for each watch brand.

Of ideal and feasibility

It’s exactly this residual reflection that remains one of the biggest challenges in developing a coating for luxury watches. The color impression should never be yellowish or reddish, as this would suggest an aging effect. The luxury watch manufacturers rather desired a watch glass whose color perception is freely adjustable and remains durable for a long time. These ideal visions were in part far from what was technically feasible.

SCHOTT researchers saw the possibility of modifying an existing, patented scratch-resistant coating for glass-ceramics also for watches and combined it with an anti-reflective coating. They worked their way towards the specifications of the watch industry and developed corresponding prototypes.

“Our goal was to develop a coating with a color-neutral residual reflection even after abrasion. This is why we came up with the idea of adapting an existing coating for glass-ceramics”

— Christian Henn, Coating Expert & Scientist, SCHOTT Research & Development

Innovation

LUXADUR™ – Watch glass. Redefined.

The result of the project? A coated sapphire watch glass that sets new standards for luxury watches in terms of durability and color fidelity.

People

“Customer specifications finally have to be manufactured on an industrial scale. After defining the color coordinates, we conducted test series on our sputter machines to scale up the process from R&D to mass production. Hence, we were able to achieve large quantities.”

— Dr. Ulf Brauneck, Expert Engineer, SCHOTT Suisse SA

Next

The luxury watch industry has been setting new technological standards for decades. SCHOTT is actively helping to shape this journey with LUXADUR™.

Let’s define tomorrow’s luxury watches.

What’s your next
milestone?

Contact

Frank Wolff
Advanced Optics
SCHOTT AG

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