Types of Water Resistance Certifications and Their Differences

Types of Water Resistance Certifications and Their Differences

Water resistance is a key feature in smartwatches, smartphones, and other electronic devices. Various standards define the level of protection against water under specific conditions. Here’s a breakdown of the most common water resistance certifications:

1. ATM (Atmospheres) Standard

Commonly used for watches and wearables
This standard measures water pressure resistance in "atmospheres" (ATM). Each 1 ATM equals the pressure at a depth of 10 meters underwater. However, this does not mean the device is safe to use at that depth, as real-world conditions vary.

• 1 ATM (10m) → Resistant to splashes, handwashing, but not submersion.
• 3 ATM (30m) → Withstands rain and light splashes, but not swimming.
• 5 ATM (50m) → Suitable for swimming in shallow water, but not diving.
• 10 ATM (100m) → Safe for swimming and water sports, but not deep diving.
• 20 ATM (200m) or higher → Suitable for medium-depth diving and heavy water activities.

✅ Note: ATM ratings are tested in static conditions. Movement in water, pressure fluctuations, and temperature changes may impact water resistance.

2. IP (Ingress Protection) Rating

Used for smartphones, smartwatches, and electronic devices
The IP rating indicates a device’s resistance to dust and water. It consists of two digits, such as IP67 or IP68:

• First digit (0-6) → Dust resistance level
• Second digit (0-9) → Water resistance level

Common IP Water Resistance Ratings:

• IPX4 → Resistant to splashes from all directions, suitable for sweat and light rain.
• IPX5 → Withstands strong water jets, ideal for heavy rain.
• IPX6 → Resistant to high-pressure water sprays but not submersion.
• IP67 → Dustproof and resistant to submersion in water up to 1 meter for 30 minutes.
• IP68 → Dustproof and resistant to prolonged submersion (depth and duration vary by manufacturer).

✅ Note: IP68 is one of the best ratings for smartphones and smartwatches, offering strong dust and water resistance.

3. ISO 6425 Certification (For Diving Watches)

Watches with this certification undergo special tests for high-pressure resistance, shock durability, and temperature changes. If a watch is labeled Diver’s Watch, it has passed ISO 6425 standards.

Categories under ISO 6425:

• ISO 6425 Diver’s 100M → Suitable for swimming and shallow diving.
• ISO 6425 Diver’s 200M & 300M → Ideal for professional diving.
• ISO 6425 Saturation Diver’s Watch → Designed for deep-sea diving with special gas mixtures.

✅ Note: A high ATM rating alone does not guarantee a watch is suitable for diving unless it has ISO 6425 certification.

Comparison of Water Resistance Certifications

Tips to Maintain Water Resistance

1. Avoid pressing buttons underwater (unless the device is specifically designed for diving).
2. Rinse the device with fresh water after exposure to saltwater to prevent corrosion.
3. Do not use water-resistant devices in saunas or hot showers, as heat can weaken seals.
4. Water resistance may degrade over time, so older devices may not have the same protection as when new.

Conclusion

If your device is designed for daily use and sports, IP68 or 5 ATM certification is sufficient. However, for diving, you need ISO 6425 Diver’s Watch certification. Always check the manufacturer’s specifications, as depth and duration limitations vary by model.

🔹 ATM measures water pressure but does not guarantee real-world waterproofing.
🔹 IP68 is suitable for temporary immersion but not for prolonged swimming or diving.
🔹 ISO 6425 is the best option for deep and professional diving.