IP67 and IP68 are among the most frequently cited specifications in electrical and electronic component datasheets — but what do these codes actually mean, and how do they relate to electrical insulation and potting applications?
How to Read an IP Rating
The IP (Ingress Protection) rating is defined by IEC 60529 and consists of two digits:
- First digit: Solid / dust protection (0-6)
- Second digit: Liquid / water protection (0-8)
What Does IP67 Mean?
IP67 = Dust tight (6) + Temporary immersion up to 1 metre for 30 minutes (7)
Standard target for outdoor applications, underground cable joints, and electrical equipment in wet or dusty environments.
What Does IP68 Mean?
IP68 = Dust tight (6) + Continuous immersion beyond 1 metre depth (8)
Exact depth and duration specified by the manufacturer — e.g. “IP68 (3m, 60 minutes)”.
IP Protection Rating Comparison
| IP Rating | Protection | Typical Use |
|---|---|---|
| IP54 | Dust protected + splash | Enclosed outdoor equipment |
| IP65 | Dust tight + water jet | Outdoor panels |
| IP67 | Dust tight + 1m/30min immersion | Underground cable joints |
| IP68 | Dust tight + continuous immersion | Marine, critical underground |
How Does Potting Resin Achieve IP Protection?
- Fills all internal voids — no pathway for moisture ingress
- Anchors cable entry points — prevents movement-related leakage
- Additional protection layer even if gasket degrades
Important: Air voids, incomplete fill, or surface contamination will compromise IP protection regardless of the resin system used.
Which Application Needs Which IP Rating?
| Application | Recommended IP |
|---|---|
| Indoor electrical panel | IP54–IP65 |
| Outdoor lighting connection | IP65–IP67 |
| Underground cable joint | IP67–IP68 |
| EV charging cable joint | IP67–IP68 |
| Solar panel junction box | IP67–IP68 |