IP18 vs IPX4
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP18 and IPX4 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 1 vs 0) and liquid protection (level 8 vs 4). IP18 is rated for > 50 mm — back of hand and continuous immersion (manufacturer-specified), while IPX4 provides no protection and splashing water (all directions).
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.
IPX4 (solid protection not specified) resists splashing water from any direction. A common minimum for bathroom and outdoor-covered appliances where dust sealing is not required.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP18
1 — > 50 mm — Back of Hand
IPX4
0 — No Protection
Liquid protection (second digit)
IP18
8 — Continuous Immersion (manufacturer-specified)
IPX4
4 — Splashing Water (all directions)
Dust-tight
IP18
No
IPX4
No
Water-jet resistant
IP18
Yes
IPX4
No
Submersible
IP18
Yes
IPX4
No
Outdoor suitable
IP18
Yes
IPX4
Yes
The exact difference (IP18 vs IPX4)
Solid protection
IP18
Level 1 — > 50 mm — Back of Hand
IPX4
Level 0 — No Protection
IP18 provides "> 50 mm — Back of Hand" (level 1), while IPX4 provides "No Protection" (level 0). IP18 is 1 level higher.
Liquid protection
IP18
Level 8 — Continuous Immersion (manufacturer-specified)
IPX4
Level 4 — Splashing Water (all directions)
IP18 handles Specified by manufacturer (Continuous Immersion (manufacturer-specified)), while IPX4 handles 50–100 kPa (Splashing Water (all directions)). IP18 provides 4 levels more liquid protection.
NEMA equivalents
No direct NEMA equivalent.
No direct NEMA equivalent.
Recommendation
IP18 offers higher overall protection than IPX4. Choose IP18 for harsher environments; IPX4 may suffice for milder conditions and can be more cost-effective.