IP67, IP68, and ‘Water-Resistant’: What Device Protection Ratings Actually Mean
Learn what IP67, IP68, and water-resistant labels actually promise—and why test conditions, wear, liquids, and warranty terms still matter.
IP67 and IP68 do not mean that a device is waterproof in every situation. They are standardized enclosure-protection ratings. In the familiar two-digit form, the first digit describes protection against access and solid particles, while the second describes protection against water under defined test conditions. An IP67 device has a dust-tight “6” and a “7” for temporary immersion; an IP68 device has the same dust-tight “6” and an “8” for a more demanding immersion category whose exact conditions must be read in the manufacturer’s documentation.
The practical lesson is simple: read the code, then read the footnote. A laboratory result can help you compare products, but it cannot promise that an aging phone will survive every pool, beach, shower, spill, depth, temperature, or repair.
What does an IP rating mean?
IP is the code used by IEC 60529, the international standard for degrees of protection provided by electrical-equipment enclosures. The enclosure is the case, shell, seals, covers, ports, and other barriers that separate sensitive parts from the surroundings.
The two main numerals answer different questions:
| Code part | What it describes | Example |
|---|---|---|
| First numeral | Protection against access and solid foreign objects, including dust | In IP68, the first numeral is 6: dust-tight. |
| Second numeral | Protection against harmful water ingress under a defined test | In IP68, the second numeral is 8: an immersion category. |
| Letter X | No protection level is specified for that position | IPX8 states a water rating but does not state a solids rating in the code. |
An X is not another way to write zero. Zero means the code declares no protection for that category; X means that characteristic is not specified in the marking. That distinction matters when comparing labels.
IP67 versus IP68
What IP67 tells you
In IP67, the 6 indicates dust-tight protection. The 7 indicates protection against the effects of temporary immersion under the applicable test conditions. A manufacturer may publish the corresponding depth, duration, device configuration, and other limits for a particular product. Those details are part of the useful claim; “IP67” should not be separated from them.
What IP68 tells you
In IP68, the 6 again indicates dust-tight protection. The 8 indicates protection against the effects of continuous immersion under conditions specified for the product and test. Here, “continuous” names a test category. It does not grant unlimited underwater use.
Two products can both carry IP68 while their stated immersion conditions differ. Apple’s current support information, for example, lists different IP68 iPhone models with declared maximum depths of two, four, or six metres for up to 30 minutes. The shared code therefore does not replace the model-specific limit.
Does the higher number include every lower water test?
Do not assume that one large numeral means a device has passed every imaginable water exposure. Dripping, spraying, jets, temporary immersion, and longer immersion are different test situations. If resistance to a particular exposure matters, look for the exact rating or ratings and the manufacturer’s instructions rather than treating the code as a single waterproofness score.
Why a laboratory rating is not an unlimited-use guarantee
A controlled test reduces uncertainty by holding conditions steady. Everyday life does the opposite. A device may encounter movement, impacts, aged seals, salt, soap, heat, pressure, or a damaged port. Each difference can change the result.
- Liquid type: Fresh water is not the same as salt water, chlorinated pool water, a sugary drink, detergent, sunscreen, or another chemical mixture.
- Motion and pressure: A still immersion test is different from swimming, diving, falling into moving water, or being hit by a pressurized jet.
- Temperature: Steam, saunas, hot water, and rapid temperature changes can create conditions that a standard room-temperature test does not represent.
- Time and depth: A short exposure at a stated depth is not evidence for a deeper or much longer exposure.
- Wear and damage: Drops, bending, cracked glass, worn seals, corrosion, and disassembly can weaken the enclosure.
- Configuration: Covers, trays, doors, plugs, accessories, and ports may need to be correctly closed or installed for the declared protection to apply.
This is why responsible product pages pair a rating with conditions and cautions. Apple states that splash, water, and dust resistance are not permanent and may decrease with normal wear. Samsung similarly tells users to check the exact model because ratings and conditions vary.
Five claims that sound similar but are not equivalent
| Claim | Reasonable interpretation | What it does not prove |
|---|---|---|
| “IP67” | A standardized dust and temporary-immersion classification | Survival in every liquid, depth, temperature, or damaged condition |
| “IP68” | A standardized dust and manufacturer-specified immersion classification | Unlimited underwater operation or identical limits across all products |
| “IPX8” | A water-ingress classification is stated | A solids or dust rating |
| “Water-resistant” | The seller is making some claim about water exposure | A particular standardized test unless the rating and conditions are supplied |
| “Waterproof” | A marketing word that requires careful qualification | Invulnerability to all water-related conditions |
Four real-world scenarios
A rainy walk
A rated device may be designed to resist ordinary accidental exposure, but check whether its ports, covers, or accessories have special instructions. After exposure, follow the manufacturer’s drying and charging guidance. A visible rating is useful evidence; it is not permission to ignore the manual.
A pool photograph
A pool adds chemicals, movement, uncertain depth, and the possibility of a longer exposure. Even if the device has an immersion rating, the manufacturer may advise against swimming or intentional submersion. “It survived a test” and “the company recommends this activity” are different statements.
A day at the beach
Salt water and sand create a combined challenge. Salt can leave conductive or corrosive residue, while fine particles can collect around openings or scratch surfaces. A dust-tight rating and an immersion rating still need to be interpreted alongside cleaning guidance and stated exclusions.
A device that was dropped or repaired
The label normally describes the product as tested in a specified condition, not every future condition after an impact or repair. If the frame, glass, adhesive, tray, or seal has changed, do not assume the original resistance is unchanged. Ask the manufacturer or repair provider what protection, if any, remains.
How to compare two devices without being misled
- Match the exact model. Similar names, generations, and regional versions may have different ratings.
- Separate the digits. Read the solids protection and water protection independently.
- Find the test conditions. Look for stated depth, duration, liquid, temperature, and device configuration.
- Read the cautions. Check guidance about swimming, high-pressure water, steam, salt water, soap, charging, and repairs.
- Check the warranty separately. A resistance rating and warranty coverage answer different questions. Some manufacturers exclude liquid damage even on rated products.
- Consider the device’s history. Age, impacts, cracks, and repair work may matter more than the code printed when the product was new.
For a school comparison, students can make a small evidence table using two manufacturer support pages. Record the exact model, full IP code, declared test conditions, warnings, and warranty language. The goal is not to crown one universal winner; it is to practise reading a technical claim in context.
What students, families, and educators should remember
- Students: Treat an IP code as evidence from a defined test, not as a superhero shield. Translate each digit and locate the conditions before making a claim.
- Families: Save the support page for the exact device model. It is more useful after a spill than a general memory that the product was advertised as water-resistant.
- Educators: IP ratings make a strong media- and standards-literacy example. Ask learners to distinguish the measured classification, the manufacturer’s instructions, the advertisement, and the warranty.
Related IQGradeUp articles
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- Inside an Elevator Ride: Cables, Sensors, Counterweights, and Safety Brakes explores how engineering systems combine physical barriers, testing, controls, and multiple safety layers.
Sources
- International Electrotechnical Commission: IEC 60529—Degrees of protection provided by enclosures
- Samsung: Solid foreign object and water resistance rating guide
- Apple Support: About splash, water, and dust resistance of iPhone 7 and later
The bottom line
IP67 and IP68 are useful, specific pieces of evidence. The first digit tells you about solids; the second tells you about a defined water test. Neither code promises permanent, universal waterproofness. The best comparison combines the rating with the exact model’s test conditions, cautions, current physical condition, and warranty terms.