How Is Water Resistance Determined?

August 23, 2022 3 min read

If you are interested in knowing how your watch or other piece of electronic equipment is waterproof, this article will provide you with an overview of the different levels of water resistance, from passive to active. Learn what each level means and which factors influence it. You may be surprised at the results! Below is a brief explanation of each term. To further understand how water resistance is determined, look for the bar rating.

Water-Resistant

The force of friction between an object and water increases with its size and the density of the liquid. If the object is larger, the more water particles it collides with, and the larger the force, the greater the resistance. This effect is also seen in swimming, where you must push out water and lose momentum because of the friction. Generally, the larger the object is, the stronger the resistance. The same applies to airplanes and cars.

While water resistance is a good thing, it's not indestructible. It can be lost because of poor conditions or normal wear and tear. Seals may fail over time, and physical damage can allow water to seep inside. Neither of these conditions is covered by most warranties. Therefore, it's best to read the manufacturer's fine print before you buy a phone that claims to be "waterproof."

IP Rating

When looking for a new smartphone, make sure to check the IP rating. This rating tells you if a device can withstand water or dust and will not be damaged by immersion. The IP rating is the same as that for dust, but the second digit (IP68 or IP67) refers to water resistance. If your phone is IP67-rated, it can survive a one-meter-deep immersion in water for thirty minutes. If you want a phone that can withstand more than that, you'll need to get an IP68-rated phone.

The IP rating refers to the degree of protection the device offers against harmful particulates and solid objects. It measures how much a device can protect itself against the ingress of moisture. The number represents the protection against varying intensities, angles, and depths. The number indicates the level of protection the device or component has against different pressures. The number should be higher than zero if it is more resistant to water. A higher IP rating will give you peace of mind knowing that your device is protected from the risks of flooding or water damage.

Bar Rating

A watch's bar rating means that it can withstand water pressure at a certain level. Typically, watches that have a 20 bar rating can withstand water pressure at 200 meters. Other watch manufacturers use the term ATM, which is an abbreviation for atmospheric pressure, interchangeably. A watch with a 30-bar rating can withstand pressure at 300 meters. Then again, there are many other considerations when evaluating a watch's water resistance.

Watches with a 30 bar rating are waterproof for up to 100 metres (330 feet), but this does not necessarily mean that they can withstand the pressure of a water jet at 10 bars. Water jets, which are applied at such high pressures, will put extra pressure on the watch, which can ruin it. Moreover, a watch that has a 10-bar water resistance rating is suitable for swimming in most cases.

Active Submersion

In order to understand the difference between active submersion and water resistance, we need to know a little bit about the physical characteristics of these two different categories. Active submersion is a more hazardous condition for a watch, as the sudden changes in external pressure and temperature can cause the components to expand and cause gaps. Moving water can also damage the components. Fortunately, active submersion is possible with many different types of watches.

Test Conditions

Water resistance is a critical building performance criterion, particularly in climates with wind-driven rain. As a result, keeping water out of a wall assembly is critical for the building's long-term health. Water resistance is measured using the ASTM E331 standard test conditions for curtain wall and individual window or door assemblies. Listed below are the most common test conditions for water resistance:

Watches that pass this test must be completely sealed and resistant to external forces. The pressure is 125% higher than the product's rated pressure, and the watch is exposed to an external force of five Newtons perpendicular to the crown and push buttons. The watch must also withstand a condensation test before and after testing. For the UL, this test must be conducted a minimum of twice. The water pressure is gradually reduced and the watch is removed.



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