# IP67 vs IP68 Connectors: What the Ratings Do—and Do Not—Prove

Understand IP67 and IP68 connector ratings, test conditions, assembly dependencies, and the extra evidence needed for pressure wash, fluids, vibration, and field use.

- Category: Sealed connector systems
- Audience: Product, test, systems, automotive, marine, and field engineers
- Published: 2026-01-28
- Updated: 2026-09-02
- Reading time: 9 minutes

## Direct answer

IP67 generally indicates dust-tight protection and temporary immersion under the cited test conditions, while IP68 indicates dust-tight protection and immersion conditions specified by the manufacturer beyond the IP67 test. For connectors, verify whether the rating applies mated, unmated, capped, terminated, or panel mounted, and confirm the exact depth, duration, cable, seals, and assembly procedure.

## Key takeaways

- IP68 is not one universal immersion test; manufacturer-stated conditions matter.
- Mated and unmated states can have different protection levels.
- Wire seals, plugs, panel seals, and backshells are part of the rated configuration.
- Pressure washing, steam, oils, fuels, and salt exposure require separate evidence.

## Read the two digits correctly

The code is useful because it separates solid-particle and water ingress tests. It is not a complete environmental specification, and a higher second digit does not silently add unrelated capabilities such as chemical resistance or high-pressure washdown.

**Simplified IP-code interpretation**

| Code | First digit | Second digit | Key qualification |
| --- | --- | --- | --- |
| IP67 | 6: dust-tight | 7: temporary immersion | Use the applicable standard’s test conditions |
| IP68 | 6: dust-tight | 8: specified continuous immersion | Depth and duration are agreed or stated |

## Ask what configuration was tested

A loose housing on a distributor page is not the tested system. Ratings commonly depend on correct terminal seating, lock engagement, wire-seal compression, and panel installation.

- Mated connector pair or individual half
- Unmated half with a specified protective cap
- Correct production wire and insulation range
- All cavities populated or approved cavity plugs installed
- Panel cutout, gasket, torque, and mounting orientation
- Specified backshell, conduit, cable gland, or potting

## Map the application exposure

Describe the real mechanism: rain, splash, temporary puddle immersion, sustained submersion, pressure washing, condensation, dust, mud, thermal cycling, or fluid spray. Add temperature, pressure differential, orientation, and exposure frequency. Then select tests that reproduce the relevant stress rather than choosing the largest IP number.

For marine, vehicle, food-processing, and industrial environments, salt, fuels, hydraulic fluids, detergents, UV, and steam can dominate material performance even when water ingress is controlled.

## Validate the production assembly

1. Freeze the exact housing, terminal, seal, plug, wire, accessory, and process combination.
2. Inspect crimp and terminal seating before environmental testing.
3. Run ingress exposure in the critical mated and service states.
4. Measure insulation resistance, continuity, contact resistance, and visible moisture after exposure.
5. Repeat after vibration, thermal cycling, or mating cycles when those stresses can disturb seals.

## Write a testable requirement

Replace “connector shall be waterproof” with a state-based requirement: exact connector configuration, whether it is mated or capped, exposure depth or spray conditions, duration, fluid, temperature, electrical state, and acceptance criteria. That wording lets sourcing, assembly, and validation teams preserve the original design intent.

> IP67 or IP68 is a useful evidence label; the engineering requirement is the actual exposure your connection must survive.

## Frequently asked questions

### Is IP68 always better than IP67?

Not for every application. IP68 immersion conditions are manufacturer-specific, while pressure wash, chemical, thermal, and unmated protection may require different tests or features.

### Is an unmated IP67 connector still protected?

Only if the manufacturer explicitly rates that unmated configuration, often with a specified cap. Many ratings apply to the correctly mated assembly.

### Does IP68 mean the connector can stay underwater indefinitely?

No. The declared depth, duration, configuration, and test conditions must be checked; IP68 is not one universal unlimited-immersion claim.

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