The Actual Science Behind Water-Resistant Watches & Common Misconceptions

Introduction

One of the most frequently asked questions when buying a wristwatch is about its water resistance feature. This feature is directly linked to the watch’s lifespan and durability. The water resistance in watches is measured using ratios like 30M, 50M, and 100M. Typically, this information is also displayed on the back of the watch. But you know what? These ratios are often misunderstood by users, who think they relate to the depth at which a watch can survive underwater. In reality, it means something else, which we will elaborate on today.

In today’s guide, we will discuss how the water resistance feature in a watch actually works. What are the common misconceptions about the water resistance features of a watch? Moreover, we will also discuss the factors that impact water resistance efficiency.

Water-Resistant Watches

Water-resistant watches are specifically designed to withstand water and moisture. In simple terms, these watches prevent liquid from entering the case and damaging the internal components. It may include normal water, rainwater, or seawater, as specified by the water resistance ratios of a watch.

In watches, water resistance is accomplished using materials such as silicone gaskets, Screw-down crowns, case backs, and sealed construction. Similarly, the water resistance level is measured using units such as meters (m), atmospheres (atm), and bars. Here, 1 ATM = 10 meters = 1 bar = Standard atmospheric pressure at sea level.

Water Resistance Measurement Ratings

You have often noticed water resistance measurement ratings, such as 30m, 50m, 100m, 200m, and 300m, on the dial or the back of a watch case. These values actually relate to the static pressure a watch can withstand in lab tests, not the actual depth in real life. Let’s check these values.

30m / 3 ATM / 100ft: Splash-resistant, ideal for handwashing and rain.
50m / 5 ATM / 165ft: Light swimming, ideal for brief submersion or showering.
100m / 10 ATM / 330ft: Swimming & Snorkeling, ideal for most water sports.
200m / 20 ATM / 660ft: Professional Water Use, suitable for scuba diving.
300m / 30 ATM / 985ft: Professional Diving, ideal for deep-sea and saturation diving.

How do Manufacturers test Water Resistance?

During lab testing, manufacturers test the water resistance of a watch using pressurized chambers that simulate underwater conditions. It includes,

Dry Testing

In the dry testing method, experts place the watch in a chamber to test its resistance using air pressure. Both Positive and Negative air pressure are implemented on the watch during this test. The pressure sensors on the other end detect leakage if the case expands or contracts.

Wet Testing

In the wet testing method, experts conduct both air and water tests to observe the presence of air bubbles and assess the functionality of the seals. It includes the two-chamber method and the deep water immersion test. This test requires careful handling to avoid possible damage.

How Water Resistance in Watches Works

1: Watch Gaskets (Seals)

The gaskets in watches are rings made of rubber or silicone material. They are used around the openings in the watch. Their purpose of usage is to seal the tiny gaps through which water can enter the watch. The latest models of high-end watches often use synthetic rubber or fluoropolymer gaskets, which can last longer than those made from other materials.

2: Screw-Down Crown

The watch crown is the only point that can easily expose the watch to water. It provides a direct path to water, allowing it to enter the watch and potentially damage the parts. To prevent such exposure through the crown, manufacturers have introduced the screw-down crown. It simply means that when the crown is screw-down, it presses efficiently against the gasket, eliminating any leakage or gap.

3: Case Construction

A watch case is usually made of steel, titanium, or ceramic material. A water-resistant watch case provides remarkable protection against water damage. These cases are designed to withstand both internal and external pressure without compromising their integrity. The water-resistant case is attached with gaskets, eliminating any gaps or leaks. High-end and professional watches can easily withstand pressure at levels of 100m and 200m.

4: Case Back

The case back is the rear or back cover of the watch. These back cases also provide water resistance based on their type and standard. The notable among them are screw-down and snap-fit case backs. The screw-down case back connects with a gasket that creates a seal to prevent water and moisture from entering the area. Similarly, the snap-fit case back is a plastic or other material back that is strongly attached to the watch.

5: Watch Crystal

The watch crystal is the front face of the watch, protecting the internal components from water, dust, and other environmental effects. The watch glass is usually made of sapphire, mineral, and acrylic materials. The watch crystal is attached using the gaskets to prevent water and other damage. Similarly, professional-grade watches use a thicker watch crystal to withstand the pressure of deep water.

Factors Affecting Water Resistance Over Time

Aging Gaskets: With the passage of time, rubber and silicone seals become less effective in preventing water damage. Watch Gasket become dry, cracked, and lose flexibility.
Temperature Changes: A continuous exposure to hot/cold weather conditions may lead the seals to create a gap between them. It usually occurs due to expansion and contraction.
Shock and Impact: A sudden shock, impact, or dropping the watch may damage its internal components and loosen the watch crystal, including the water resistance seals.
Improper Crown Position: If the watch crown is left unscrewed or is not fully pushed in. It can create a path for water to enter the watch and damage its internal components.
Chemical Exposure: Exposure to chemicals can compromise the water resistance features of the watch. Perfumes, detergents, and salt water can damage the water protection seals.

Common Misconceptions About Water Resistance

Myth 1: 30 Meters Means 30 Meters Deep

Some users believe that the figures displayed on the watch, such as 30m, 50m, or 100m, indicate that the watch is suitable for depths of up to those levels underwater. In reality, it’s not true, but rather a misconception. The mentioned figures indicate that the watch has been tested for static pressure by lab experts.

Myth 2: Water Resistance Is Permanent

Another misconception in the watch community is that water resistance is permanent. In actuality, it’s not permanent because components lose their operating efficiency over time and require component replacement. So the fighting against water damage may become compromised at some stage of the watch-wearing journey.

Myth 3: Pressing Buttons Underwater

It is not recommended to press the watch buttons underwater. It can allow water to enter the watch and damage its components. Some of the specific models are designed to support button pressing underwater, but not all watches include this feature. So, the water resistance does not mean that one can press the buttons underwater.

Myth 4: Hot Showers are Safe

Another misconception that lies in the minds of users is that hot showers are safe for watches. No, the hot showers are not safe for the water-resistant watches. However, it can cause irreparable damage, as the hot water causes the gaskets to contract/expand, resulting in the loss of seals and creating gaps for water to enter the watch.

Myth 5: Waterproof and Water-Resistant Mean the Same

There is a lot of difference between waterproof and water-resistant. Some users believe that water-resistant means the watch is completely waterproof. However, in reality, it is not; it can fight against water damage, but only up to certain limits. Exposure to over-limit conditions can damage the watch, even if it is an expensive one.

Maintenance of the Watch’s Water Resistance

Always prefer periodic service and maintenance of your watch from time to time.
Always keep an eye on the position of the crown before exposing it to water.
Avoid sudden shifting from hot to cold temperatures or vice versa.
If the watch is exposed to saltwater, try to clean it immediately with fresh water.
Avoid pressing the watch button when in underwater conditions.

Final Remarks

Understanding the science behind the working mechanism of water resistance in a watch is essential for making informed decisions when purchasing one for yourself. Understanding measurement ratios can help you save money on expensive watches by incorporating water-resistant features. Moreover, clearing the misconceptions is also important to keep your watch maintained and durable. Follow the recommendations provided by watch manufacturers, perform regular periodic service on your watch, and enjoy the time passing journey with your watch.

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