IP68 is an IEC 60529 ingress-protection rating. The first digit, 6, is the highest solids rating: the enclosure is fully dust-tight, with no ingress of dust at all. The second digit, 8, is the highest liquids rating in the standard’s numbered scale: protection against continuous immersion in water, typically beyond 1 metre, under depth and duration conditions the manufacturer specifies.
This makes IP68 devices suited to demanding environments where sealing against both fine particulates and prolonged submersion matters:
- Outdoor and buried deployments exposed to rain, mud, and dust
- Flood-prone or submerged locations such as manholes, wells, and water tanks
- Heavy washdown areas in agriculture and industry
Enclosure rating is a key selection criterion because a sensor that fails on water or dust ingress can corrode, short, or drift long before its battery is spent. Because the “8” immersion conditions vary by vendor, confirm the rated depth and exposure time in each device’s datasheet rather than assuming all IP68 products are equivalent.
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Frequently asked questions
Is IP68 waterproof?
IP68 protects against continuous immersion in water, generally beyond 1 metre depth. The exact depth and duration are defined by the manufacturer, so always check the device datasheet rather than assuming a universal limit.
What do the digits in IP68 mean?
Per IEC 60529, the first digit (6) is the highest solids rating: dust-tight, with no ingress of dust. The second digit (8) is for liquids: protection against continuous submersion under conditions the manufacturer specifies.
How is IP68 different from IP67?
Both are dust-tight (first digit 6). IP67 covers temporary immersion to 1 metre for 30 minutes, while IP68 covers continuous immersion at greater depths defined by the manufacturer.