Why is the wrist watch not resistant to warm water?

Generally speaking, most wrist watches have a certain degree of water resistance, and Diving Watch have a higher level of water resistance. But many friends have a little misunderstanding about the waterproof of watches, that is, waterproof watches should be resistant to any kind of water. In fact, watches cannot touch warm water, even professional Dive watch. So do you know what this is? Let's share some waterproof knowledge of watches.

The waterproof principle of the watch: From the structure of the Wrist Watch, the parts that need to be waterproof are the Watch Case and case back , the Watch Crown and the Watch Glass. These accessories are customized according to the customer's waterproof level requirements. Taking the watch case back as an example, there are three styles to choose from. The first one is the Snap case back, which fits closely with the case directly, so the water resistance is poor. The second is the screw case back, the case and the bottom cover are fixed by screws, which is highly waterproof. The third type is the lock case back, the case and the bottom cover are screwed together, and the water resistance is strong. These bottom covers are provided with sealing rings, which are used to fill the gaps and enhance their water resistance.

The reason why the watch cannot touch hot water: In fact, it is the reason for thermal expansion and cold contraction. Because the watch case, watch glass, and waterproof ring are three different materials, the degree of expansion after being heated is different, so when cold cut back If the speed used when shrinking is inconsistent, a gap will be created, and water molecules such as water vapor can enter the inside of the watch, thereby affecting the operation of the watch.

The effect of moisture entering the watch: water vapor will gradually invalidate the lubricating oil of the movement, making the movement performance worse. Secondly, frequent entry of water vapor will cause discoloration or rust of the Watch Hands and dial. Seriously directly lead to rust or even damage to the movement parts.

So when you find that your watch has water mist, you need to pay attention to whether there is a problem with the seal, and you need to repair it in time.