IP66 vs IP69K
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP66 and IP69K are both IEC 60529 ingress protection codes, but they differ in liquid protection (level 6 vs 9K). IP66 is rated for dust-tight and powerful water jets (12.5 mm nozzle), while IP69K provides dust-tight and high-pressure, high-temp water jets.
IP66 is dust-tight and resists powerful water jets (12.5 mm nozzle, 100 kPa). A robust outdoor rating for equipment exposed to heavy rain, storms, or directed high-pressure hosing (but not high-pressure washdown).
IP69K is dust-tight and resists high-pressure (8–10 MPa), high-temperature (80 °C) water jets. The highest IP rating, required for food, beverage, and pharmaceutical washdown environments.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP66
6 — Dust-Tight
IP69K
6 — Dust-Tight
Liquid protection (second digit)
IP66
6 — Powerful Water Jets (12.5 mm nozzle)
IP69K
9 — High-Pressure, High-Temp Water Jets
Dust-tight
IP66
Yes
IP69K
Yes
Water-jet resistant
IP66
Yes
IP69K
Yes
Submersible
IP66
No
IP69K
Yes
Outdoor suitable
IP66
Yes
IP69K
Yes
The exact difference (IP66 vs IP69K)
Solid protection
IP66
Level 6 — Dust-Tight
IP69K
Level 6 — Dust-Tight
Both IP66 and IP69K share the same solid protection: Dust-Tight.
Liquid protection
IP66
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP69K
Level 9 — High-Pressure, High-Temp Water Jets
IP66 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)), while IP69K handles 8–10 MPa (High-Pressure, High-Temp Water Jets). IP69K provides 3 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP69K offers higher overall protection than IP66. Choose IP69K for harsher environments; IP66 may suffice for milder conditions and can be more cost-effective.