With the development of the times, the waterproof performance of watches (Water Resistant) has been generally recognized by people. There are two common expressions for waterproof performance, one is the waterproof depth (meters), and the other is the compression value (unit: Bar or ATM). The relationship between the two is that the underwater depth increases by 10 Meters, it will increase the pressure equivalent to 1 atmosphere, that is: 1ATM = 10m waterproof. Regarding the waterproof performance of watches, national and international standards have clear regulations: All watches marked as waterproof must withstand at least 2 atmospheres, that is, no water can enter at a depth of 20 meters. Water resistance of 30 meters means that the watch can withstand 3 atmospheres, and so on. The premise of this standard is that the test is under laboratory conditions: the temperature is maintained at 20-25 degrees Celsius, and the watch and water are in a static state. In this case, if the watch is waterproof, it is qualified.
Actual embodiment of waterproof depth
The waterproof specifications of general watches are divided into the following categories: 30-meter waterproof watches, which can be used for daily grooming or use in the rain, that is, water drops only splash on the surface without any water pressure on the watch; the higher level, the most common Marked as a 50-meter waterproof watch, it can be used for general housework and showering, etc.; a 100-meter waterproof watch can be used for swimming and snorkeling, and only a waterproof watch that reaches or exceeds 200 meters is called a diving watch and can be used for underwater Diving activities. In life, the movement of the arm of the wearer in the water will greatly increase the water pressure on the watch, so it is not possible to wear it to the theoretical depth indicated by the laboratory testing machine.
In the structure of the watch, the seal (0-ring) has the greatest impact on the waterproof performance. It is made of materials such as rubber, nylon or Teflon. A waterproof seal is formed at the junction between the crystal glass, the back cover and the crown and the case. If it is a chronograph, its pusher will also have a gasket. The waterproof case is lined with a sealing coating to prevent water seepage. At the same time, the thickness and material of the watch case can also determine whether a watch can be safely worn underwater.
It is worth noting that, according to the regulations issued by the Federal Trade Commission (Federal Trade Commission), watch sellers are not allowed to mark their watches as “fully waterproof.” Even if the watch is designed for deep-sea diving, it cannot be claimed to be completely waterproof. The water resistance of the watch is not permanent and is affected by wear or time. The gasket may corrode or deform, the case may be damaged, or the crystal glass may loosen or crack.
The infinite thirst for knowledge and conquest of the mysterious ocean has made many adventurers and even watchmakers devoted themselves to the study of the ocean at all costs. The dive watch is the true witness and shocking result of this exploration process. The difference between a waterproof watch and a diving watch is that the waterproof watch is only designed for daily life, while the diving watch is a professional accurate timepiece to ensure a certain degree of pressure resistance at a specific diving depth and to ensure that the time can be truly recorded. The powerful functions of the diving watch, the masculine sporty appearance, and the meaning of exploring the ocean have made many men crazy.
In terms of structure, diving watches often use threaded crowns to prevent water from seeping through the rotating holes. Tightening the crown on the watch creates a waterproof seal, just like the seal between a jar and a screw cap. The gasket is made of a material that can withstand helium in the diver’s decompression chamber. Some watches are equipped with valves that the wearer can use to release the helium gas that has penetrated into the watch so that when the watch and the diver adjust to normal atmospheric pressure, the watch case will not burst. Usually diving watches should also be equipped, including: a rotating outer ring for measuring diving time (with a bezel design to prevent reverse rotation); luminous hands and scales that are convenient for reading the time on the seabed in the dark.
Since Rolex (Rolex) launched the first “Oyster watch” in 1926, the vast field of diving watches has been opened up. Since then, many watch brands have their own diving watch series, and many watchmakers and brands have begun to manufacture high-performance diving watches for professional diving organizations or the military, including starting to make diving watches for the Navy. Panerai (Panerai) and so on. With the advancement of science and technology, super diving depth is also a project developed by major watch brands.
On January 23, 1960, the Trieste in the deep-sea submersible dived 10,916 meters below the surface of the sea with the Rolex in the Mariana Trench. This expedition into unknown waters successfully rewritten the history of human conquest of the ocean . Today, 50 years later, this record has not been broken, and the depth of the dive is beyond reach. It has therefore become a milestone event for mankind to explore the deep-sea world, and it has also greatly strengthened mankind’s awareness of ocean protection. However, it is difficult for people in life to have the opportunity to go to a depth of more than 1,000 meters, but this does not hinder people’s enthusiasm and attention to diving watches. The mystery and the yearning for the ocean, as well as the high integration of technology and machinery, even if they are not worn, it does not affect them to become an excellent collection.
Post time: Oct-11-2020