As far as modern watches are concerned, there are no non-waterproof watches, but most watches are basically waterproof to a certain extent. This is because water is indispensable in our lives. If the watch is not waterproof, it will undoubtedly be very inconvenient. If you can't wash your hands, take the watch off.
Moreover, after water vapor, dust, chemically corrosive gases, etc. come into contact with the movement, they will also rust due to contamination and cause the lubricating oil to volatilize, thereby affecting travel time and long-term stability. In a word, water resistance is necessary for watches.
With current technology, it is not difficult for a watch to be waterproof to a certain degree. As for non-waterproof watches, there are also watches, but they are basically art treasures designed for collection and are not used for wearing. Therefore, we wear the watch. Generally speaking, we don't need to take it off specially to wash our hands, even if you don't know how waterproof it is.
But there is a prerequisite, just wash hands and other simple life waterproof, if it really rains all the time, some watches may suffer.
why? Here I have to talk about the true meaning of the watch waterproof XX meters.
"Water resistant to 30 meters" does not mean that the watch can "dive to 30 meters underwater." The real meaning behind it is just "can resist the pressure of water at a depth of 30 meters". Generally speaking, 30-50 meters is waterproof for daily use, which can resist a small amount of splashing water from hand washing and face washing and raindrops falling when it rains, but the energy time is not too long.
The so-called 30-meter water resistance of the watch was tested in a constant temperature and static state in the laboratory. The so-called 30-meter is actually pressurized in a pressure test cylinder. 3 Baths is 3 atmospheres. The pressure of approximately 30 meters of water depth is not really a 30-meter dive!
In fact, when people wear a watch, the situation is much more complicated, whether it is environmental changes and wrist movement will affect it. Moreover, the 30-meter waterproof watch basically does not have a screw-in crown. When swimming or rainstorms, it is easy to put pressure on the crown and cause the crown to loosen, causing water to enter the watch.
Therefore, it is very important for us to understand the standard of waterproof watch.
A watch with a water resistance of 30 meters can only meet the needs of daily life, and can resist a small amount of hand washing, face splashing and rain.
Water-resistant to 50 meters, it can withstand rain erosion, and it can also be used for short-distance swimming in shallows.
Water-resistant to 100 meters, you can swim and snorkel. If you want to swim or snorkel in the water, you need to be water-resistant to 200 meters.
In addition, there are more powerful waterproof performances such as 500 meters, 1000 meters, 3000 meters, etc. The famous Rolex Ghost King has a water resistance of 3900 meters and is a veritable king of water ghosts. Of course, a watch is not as waterproof as possible. There are many factors in evaluating a watch, and the waterproof performance can meet your own needs.
If you get caught in the rain, the watch on your hand must be at least 100 meters water-resistant. It is best to choose a diving watch. But there is another problem. With the extension of wearing time, the key to the waterproof design of the watch is that the rubber ring will gradually age, lose its elasticity, and produce cracks. In addition, the waterproof paste will also deteriorate. At this time, moisture may enter the case.
Therefore, the rigorous diving watch must be re-tested and replaced every year to prevent the rubber ring and waterproof paste from aging and water.
Regarding the water resistance of the watch, there is another point that must be paid attention to, that is, no matter how good the water resistance of the watch is, it is not resistant to hot water. Therefore, wearing a watch to take a hot bath or sauna is very harmful to the clock.
Up to now, there are no watches in the world that can be used for hot baths and sauna baths. Whether it is a hot bath or a sauna, the temperature difference between the temperature and the waterproof test is too large.
What needs to be reminded is that solid materials have the nature of thermal expansion and contraction. When exposed to heat, they expand and contract when exposed to cold. There will be tiny gaps when water enters through the gaps, causing the watch to enter water.
Even if the watch has a good waterproof performance once or twice without water, it will accelerate the aging of the waterproof parts in the long run, and water in the watch may happen at any time.