What makes a watch water-resistant?
There are several features that help make a watch water-resistant. The most important is the “gaskets”, or “o-rings” made of rubber, nylon or Teflon which form watertight seals at the joints where the crystal, case back and crown meet the watch case. if the watch is a chronograph, the chronograph pushers will also have gaskets. In addition, water-resistant watch cases are lined with a sealant, applied in the form of a quick-hardening liquid, which helps keep water out. The thickness and material of the case is also a big factor in determining whether a watch can safely be worn underwater. The case must be sturdy enough to withstand pressure without caving in. In general, this means a steel or titanium case or a steel case plated with gold. Solid gold cases can be water resistant provided they are sufficiently thick. A screw-in case back, as opposed to one that pushes in, also contributes to a watch’s water resistance. A screw-in crown, a feature of many divers’ watches, helps prevent w
