IP56 vs IP18
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP56 and IP18 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 5 vs 1) and liquid protection (level 6 vs 8). IP56 is rated for dust-protected and powerful water jets (12.5 mm nozzle), while IP18 provides > 50 mm — back of hand and continuous immersion (manufacturer-specified).
IP56 is dust-protected and resists powerful water jets (12.5 mm nozzle, 100 kPa). Suited to outdoor equipment subjected to heavy rain or hose-directed water.
The IP18 classification guarantees protection against solid objects larger than 50 mm and protection against the effects of continuous immersion in water under conditions specified by the manufacturer.. It is an IEC 60529 ingress protection code combining first-digit (solid) level 1 with second-digit (liquid) level 8.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP56
5 — Dust-Protected
IP18
1 — > 50 mm — Back of Hand
Liquid protection (second digit)
IP56
6 — Powerful Water Jets (12.5 mm nozzle)
IP18
8 — Continuous Immersion (manufacturer-specified)
Dust-tight
IP56
Limited
IP18
No
Water-jet resistant
IP56
Yes
IP18
Yes
Submersible
IP56
No
IP18
Yes
Outdoor suitable
IP56
Yes
IP18
Yes
The exact difference (IP56 vs IP18)
Solid protection
IP56
Level 5 — Dust-Protected
IP18
Level 1 — > 50 mm — Back of Hand
IP56 provides "Dust-Protected" (level 5), while IP18 provides "> 50 mm — Back of Hand" (level 1). IP56 is 4 levels higher.
Liquid protection
IP56
Level 6 — Powerful Water Jets (12.5 mm nozzle)
IP18
Level 8 — Continuous Immersion (manufacturer-specified)
IP56 handles 100 kPa (Powerful Water Jets (12.5 mm nozzle)), while IP18 handles Specified by manufacturer (Continuous Immersion (manufacturer-specified)). IP18 provides 2 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
Recommendation
IP56 offers higher overall protection than IP18. Choose IP56 for harsher environments; IP18 may suffice for milder conditions and can be more cost-effective.