Key Takeaways
- IP ratings have two separate digits: one for dust resistance, one for water resistance.
- An "X" in an IP rating simply means that dimension was not tested — not that it has zero protection.
- IP68 is the highest common water-resistance rating and allows submersion beyond one meter.
- Water resistance can degrade over time, especially after drops, repairs, or general wear.
- IP ratings are tested under lab conditions and may not reflect every real-world scenario.
IP Rating
An IP (Ingress Protection) rating is a standardized code that tells you how well a device resists dust and water. The rating follows a specific format — two digits after the letters "IP" — where each digit represents a different type of protection. It is defined by the international standard IEC 60529 and is used on everything from smartphones to earbuds to outdoor lighting.
IP ratings are assigned after controlled laboratory testing, not real-world field conditions, so actual performance can vary based on factors like water pressure, temperature, and device age.
How the Two-Digit Code Works
Every IP rating consists of two numbers, and each one does a separate job. The first digit (0–6) describes protection against solid particles like dust and debris. The second digit (0–9) describes protection against water. A higher number means more robust protection in that category.
Here's a quick breakdown of what each digit range means in practice:
- First digit 0: No dust protection rated.
- First digit 5: Protected against dust that could harm the device.
- First digit 6: Completely dust-tight — no ingress under any contact.
- Second digit 4: Splash-resistant from any direction.
- Second digit 7: Submersible in up to 1 meter of water for 30 minutes.
- Second digit 8: Submersible beyond 1 meter (exact depth defined by the manufacturer).
- Second digit 9K: Protected against high-pressure, high-temperature water jets — rare in consumer devices.
So when you see IP68, you're looking at complete dust protection plus deep-water submersion resistance. When you see IP54, that's partial dust protection plus splash resistance from any direction — common in budget earbuds and outdoor speakers.
IP68
Highest common consumer water-resistance rating
IP68 is the most protective standard rating found on consumer smartphones and wearables, though exact submersion depth and duration vary by manufacturer specification.
1 meter
Maximum depth for IP67-rated devices
The IEC 60529 standard defines IP67 as protection against immersion in up to 1 meter of fresh water for a maximum of 30 minutes under controlled conditions.
IEC 60529
International standard governing IP ratings
The International Electrotechnical Commission's standard IEC 60529 is the globally recognized framework defining Ingress Protection classifications for electrical enclosures.
What the "X" Means — and Why It Matters
You'll often see ratings like IPX4 or IP6X on packaging. The letter X simply means that dimension was not tested or officially rated — not that the device has zero protection in that category.
A manufacturer might skip dust testing if the product is designed primarily for outdoor moisture exposure, or skip the water test if dust resistance is the only relevant concern. Always read what was actually tested rather than assuming the X means vulnerability.
IP Ratings Are Not Manufacturer Warranties
Many manufacturers explicitly state that water damage is not covered under warranty, even for devices with high IP ratings. The rating confirms the device passed a standardized test — it does not guarantee the manufacturer will repair or replace the device if it is damaged by water. Always check your warranty terms separately.
This distinction matters when comparing devices. A pair of workout earbuds rated IPX5 has been tested for water jets but has no official dust rating — that doesn't necessarily make them fragile around dust, just untested. For a full look at how IP ratings fit alongside other gadget terminology, see our Tech Spec Glossary.
Where IP Protection Ends
IP ratings are measured under controlled laboratory conditions using fresh, still water at normal pressure and temperature. Real-world use introduces variables that labs don't replicate:
- Saltwater and pool water are more corrosive than fresh water and are not covered by standard IP testing.
- Water pressure from a showerhead or ocean waves can exceed what IP7 or IP8 testing simulates.
- Physical damage — cracks, drops, or third-party repairs — can compromise seals and reduce effective protection.
- Aging — adhesives and gaskets wear down over time, so an older device may no longer meet its original rating in practice.
This is a similar dynamic to what happens with waterproofing in other contexts. As explored in our article on waterproof materials in bathrooms and kitchens, "waterproof" labels in general describe resistance under defined conditions — not absolute immunity. The same principle applies to your devices.
Rinse After Saltwater or Pool Exposure
If your IP-rated device is exposed to saltwater, chlorinated water, or soapy water, rinse it gently with fresh, still water afterward. These liquids are more corrosive than what IP testing uses and can accelerate seal and port degradation over time. Allow the device to dry fully before charging.
Putting It Together: Reading a Rating at a Glance
Next time you're reading a spec sheet, here's a reliable mental shortcut:
- Find the two digits after "IP."
- First digit: dust protection scale of 0–6. A 6 is completely sealed.
- Second digit: water protection scale of 0–9K. A 7 handles brief submersion; an 8 goes deeper.
- If either digit is X, that dimension was simply not tested.
For context, IP67 and IP68 are the most common ratings on mid-range and flagship smartphones. Truly budget devices often carry IP54 or lower, which covers splashes but not submersion. Fitness trackers and earbuds frequently sit at IPX4 to IPX7, depending on their intended use case.
Understanding how IP ratings connect to a broader set of specs — like display type, battery capacity, and camera aperture — can help you evaluate any device more confidently. Our guide to smartphone camera specs applies the same spec-decoding approach to photography features.
“A rating tells you what a device survived in a test chamber — not what it will survive in your pocket. Understanding the conditions of the test is the only way to know how far the protection actually extends.”
— IEC Technical Committee 70, International Electrotechnical Commission body responsible for Ingress Protection standards