IP68 vs IP21
Head-to-head comparison of two IEC 60529 ingress protection ratings.
IP68 and IP21 are both IEC 60529 ingress protection codes, but they differ in solid-object protection (level 6 vs 2) and liquid protection (level 8 vs 1). IP68 is rated for dust-tight and continuous immersion (manufacturer-specified), while IP21 provides > 12.5 mm — finger and vertically dripping water.
IP68 is dust-tight and protects against continuous immersion in water under conditions specified by the manufacturer (typically deeper than 1 meter for prolonged periods). The standard for submersible and marine equipment.
Designed for environments requiring protection against solid objects larger than 12.5 mm and protection against vertically falling drops of water. Dripping water shall have no harmful effects., IP21 is an IEC 60529 code combining solid level 2 with liquid level 1.
Detailed comparison
The stronger rating on each row is highlighted in emerald.
Solid protection (first digit)
IP68
6 — Dust-Tight
IP21
2 — > 12.5 mm — Finger
Liquid protection (second digit)
IP68
8 — Continuous Immersion (manufacturer-specified)
IP21
1 — Vertically Dripping Water
Dust-tight
IP68
Yes
IP21
No
Water-jet resistant
IP68
Yes
IP21
No
Submersible
IP68
Yes
IP21
No
Outdoor suitable
IP68
Yes
IP21
No
The exact difference (IP68 vs IP21)
Solid protection
IP68
Level 6 — Dust-Tight
IP21
Level 2 — > 12.5 mm — Finger
IP68 provides "Dust-Tight" (level 6), while IP21 provides "> 12.5 mm — Finger" (level 2). IP68 is 4 levels higher.
Liquid protection
IP68
Level 8 — Continuous Immersion (manufacturer-specified)
IP21
Level 1 — Vertically Dripping Water
IP68 handles Specified by manufacturer (Continuous Immersion (manufacturer-specified)), while IP21 handles 0.1 mm/min drip rate (Vertically Dripping Water). IP68 provides 7 levels more liquid protection.
NEMA equivalents
Recommendation
IP68 offers higher overall protection than IP21. Choose IP68 for harsher environments; IP21 may suffice for milder conditions and can be more cost-effective.