What the two digits mean
The first digit rates protection against solid objects and dust, from IP5X (dust protected, limited ingress that does not interfere with operation) to IP6X (dust tight, no ingress at all). The second digit rates water protection, from IP4X-equivalent splash protection up through IP67, which requires surviving temporary submersion. Reading a rating as one number instead of two digits with separate meanings is a common source of mis-specified enclosures.
IP54 vs. IP65 vs. IP67 in practice
IP54 suits indoor or sheltered equipment exposed to dust and occasional splashes, and can often be met with standard seam welding and a basic gasketed door. IP65 requires a dust-tight enclosure that withstands low-pressure water jets from any direction, which usually means continuous gasketing, sealed cable glands and no unsealed vents. IP67 adds temporary submersion resistance, which typically forces fully seam-welded or compression-gasketed joints and rules out simple overlapping panel seams.
Where sheet metal builds actually fail a rating
The enclosure body is rarely the weak point; the failure points are usually panel seams, door gaskets, cable and connector entries, and fastener locations that were not sealed or were spec'd with the wrong gasket compression. A single unsealed mounting hole or a gasket groove machined to the wrong depth can drop an otherwise IP65-built enclosure back to an IP54 result in testing.
Designing to the rating instead of hoping for it
Meeting a target IP rating reliably means deciding the sealing method (continuous gasket, seam weld, or compression seal) before finalizing panel breaks and fastener layout, not after. Cable entries need rated glands sized to the actual cable OD, and door or access-panel gaskets need a specified compression range, not just "add a gasket" as a late addition.
| Input | Why it matters |
|---|---|
| Target rating vs. environment | Match the rating to the real exposure (indoor/dry, outdoor/washdown, or temporary submersion) instead of defaulting to the highest-sounding number. |
| Sealing method | Continuous gasketing, seam welding and compression seals are not interchangeable; the method has to match the rating from the design stage. |
| Cable and connector entries | Every entry point needs a correctly sized rated gland or connector, since this is one of the most common rating failure points. |
| Fastener and access points | Door and panel fasteners need a specified gasket compression range, not just a gasket added without a spec. |
| Test verification | Ask whether the supplier can provide or arrange IP test verification on a sample build before bulk production. |
Next step
Use the guide to prepare a cleaner inquiry, then attach the best available files through the RFQ form. If an item is unknown, say so directly so the first reply can separate quote assumptions from confirmed requirements.