IP65 vs IP67 for AGV Wheels: Which Protection Level Is Needed?
How to decide ingress protection level based on washdown process, floor contamination, and reliability targets.
IP rating selection for AGV drive wheels should be tied to contamination reality, not to the highest number on a brochure.
Over-specification increases cost and can complicate thermal and service design. Under-specification creates downtime through water or dust ingress.
What IP65 and IP67 Actually Mean
- IP65: dust-tight and protected against water jets.
- IP67: dust-tight and protected against temporary immersion.
Important: IP code validates specific test conditions, not every real-world exposure pattern. Chemical washdown, thermal cycling, and cable stress can still cause ingress issues even with high ratings.
Environment-to-Rating Mapping
| Site Condition | Typical Risk | Practical Baseline |
|---|---|---|
| Indoor warehouse, dry cleaning, occasional splashes | Dust + splash ingress | IP65 often sufficient |
| Frequent washdown with high-pressure cleaning | Seal stress + connector ingress | IP67 candidate with connector validation |
| Outdoor transfer area with puddles and rain exposure | Intermittent immersion and contaminant mix | IP67 usually safer |
| High-dust zone with limited liquid exposure | Particle ingress and abrasion | IP65 with robust sealing can work |
The Three Design Layers You Must Validate
- Wheel-drive enclosure sealing : Housing interfaces, shaft seals, cover gasket compression.
- Connector and cable ingress path : Cable gland, bend radius, strain relief, connector seal class.
- System integration details : Mounting orientation, water accumulation points, breathing path.
Most failures come from layer 2 or 3, not from enclosure label alone.
Common Misjudgments in RFQ Stage
- Choosing IP67 without checking washdown chemistry compatibility.
- Ignoring connector class while only checking motor housing class.
- Assuming higher IP always means better lifetime regardless of heat path.
- Treating one lab certificate as complete field proof.
Each misjudgment can add hidden warranty and downtime cost.
Validation Plan Before Final Selection
Run these tests on the integrated module (not only component-level):
- Ingress stress test under real cleaning process.
- Thermal cycle test at duty profile peak.
- Connector and harness spray/immersion stress test.
- Post-test functional checks (noise, current trend, encoder signal quality).
- Re-test after disassembly/reassembly where field service is expected.
Acceptance Criteria Example
| Test Item | Suggested Pass Condition |
|---|---|
| Water ingress | No internal moisture affecting function |
| Dust ingress | No particulate contamination at critical internals |
| Electrical integrity | Stable insulation and connector continuity |
| Performance drift | No abnormal rise in current, vibration, or temperature |
| Service recovery | Unit can be reassembled and revalidated within target service time |
Tune thresholds to your own platform and risk tolerance.
Cost vs Risk View for Procurement
A useful decision logic:
Choose rating by minimum lifecycle risk cost, not by minimum purchase cost.If downtime is expensive and washdown is aggressive, IP67 often wins despite higher initial cost. If environment is controlled and service discipline is strong, IP65 can be the more efficient choice.
RFQ Inputs to Share with Suppliers
Provide these details for accurate recommendation:
- Cleaning method and frequency.
- Presence of water pooling or temporary immersion.
- Dust type and concentration tendencies.
- Target service interval and expected lifetime.
- Route temperature range and duty cycle intensity.
Without these inputs, IP recommendation quality is usually low.
Bottom Line
- Select IP65 when exposure is mainly dust and splashes in controlled indoor sites.
- Select IP67 when immersion-like exposure or harsh washdown risk is real.
- Always validate complete wheel-drive system, not enclosure only.
For help selecting sealing architecture by site condition, contact [email protected].
