Why IP67 and IP68 Do Not Guarantee Complete Water Resistance?

A consistent engineering review – IP ratings (IP67, IP68): where manufacturer marketing ends and the real water resistance of your phone begins.

What the international protection standard IEC 60529 really means

A smartphone’s resistance to water and dust is defined by the IP (Ingress Protection) code. This is an international standard (IEC 60529) that precisely indicates how well the device’s casing protects its internal components.
The code consists of two digits (e.g., IP68). Each of them denotes a different level of protection:

1. The first digit (Protection against solid particles/dust): A scale from 0 to 6. In modern phones, you usually see 6, which means complete dust tightness (*Dust-tight*).
2. The second digit (Protection against liquids/water): A scale from 0 to 9. The market is dominated by 7 and 8.

Showdown: IP67 vs IP68

Although the difference between the numbers 7 and 8 seems minimal, it is significant from an engineering perspective:

• IP67: The device can be submerged in fresh water up to 1 meter deep and remain there for up to 30 minutes without suffering damage.
• IP68: The device can be submerged deeper than 1 meter (manufacturers usually specify 1.5 m, and sometimes up to 6 m) and remain submerged for 30 minutes or longer.

It is important to emphasize that the IP68 standard is flexible – the exact depth is determined by the manufacturer, so it is always necessary to read the specifications.

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Why phones still break even with an IP68 certification

The biggest consumer mistake is thinking that the IP rating guarantees absolute safety under any conditions. The reality is different for several essential reasons:

Freshwater vs. Other Liquids

All IP tests are conducted strictly under laboratory conditions using clean, fresh water.

• Sea: Saltwater is conductive and causes corrosion. Salt aggressively eats away at rubber seals and adhesives.
• Pool: Chlorine acts similarly to salt – it breaks down seals.
• Drinks: Sugar, coffee, or alcohol, when dried inside, become a sticky mass that damages microchips or charging ports.

Pressure and Dynamics

IP tests are performed by gently submerging the phone in still water. In reality, phones often fall, are hit by waves, or are washed under strong currents. High water speed (e.g., jumping into water with the phone in hand) creates pressure that can momentarily exceed the seals’ tolerance limits.

Age and Wear

Water resistance is not a permanent feature. The special adhesives and rubber seals that ensure tightness lose elasticity over time due to temperature fluctuations (hot summer, cold winter) or physical damage (drops). A two-year-old IP68 phone is likely not as tight as it was on the day it was unpacked.

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Moisture indicators and manufacturers’ liability limits

This is the most painful part. Almost all major manufacturers (including Apple, Samsung, Sony) clearly state in their warranty terms: “Warranty does not cover liquid damage.”

Moisture Indicators (LDI)

Inside phones, there are built-in special moisture indicators (LDI – Liquid Contact Indicators). These are small, usually white strips located in the headphone jack, SIM card slot, or inside the battery compartment. If the device comes into contact with moisture, these strips change color (from white to red). The manufacturer treats this as improper use and refuses to repair the device for free.

Resistance, but not impermeability

Water resistance means that the device has measures to resist moisture but is not completely impermeable. Even if the phone stops working after falling into a puddle, the service is likely to refuse to repair it based on the LDI color change and standard warranty exclusions.

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Practical recommendations for users

If you have a phone with an IP67 or IP68 rating, consider it a friend in the rain, not an underwater camera.

• Avoid intentional submersion: Do not use the phone for underwater photography without a special waterproof case.
• After contact – rinse: If the phone falls into seawater or is splashed with a sweet drink, immediately rinse it under a gentle stream of fresh water.
• Drying: Never charge a wet phone! Most modern phones block charging if moisture is detected in the port, but always allow it to completely dry in the air (using a gentle cool airflow, but not a hairdryer or direct sunlight).
• Protect from drops: Any drop can damage rubber seals and adhesives, thus losing the original tightness.

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