Robot IP Ratings Explained: What IP54, IP65, and IP67 Do — and Do Not — Prove

When evaluating an IP65-rated robot for a food-processing facility that uses daily high-pressure washdown with chlorinated cleaners, confirm whether the manufacturer's approved cleaning procedures cover that application. IP65 describes dust-tight protection and protection against water jets under the specified test conditions. The rating alone does not establish resistance to chlorinated chemicals, suitability for close-range high-pressure cleaning, or performance after repeated thermal cycling. This article explains what IP ratings classify, what they do not establish, and what additional evidence buyers should request for the specific robot components and operating environment.

What the IP Code Actually Classifies

The IP (Ingress Protection) code is defined by IEC 60529. The current consolidated version is IEC 60529:1989+AMD1:1999+AMD2:2013 CSV, maintained by IEC TC 70. The standard classifies the protection provided by electrical enclosures against the ingress of solid objects and water. It applies to enclosures for electrical equipment with rated voltages not exceeding 72.5 kV.

The IP code does not classify:

• Chemical resistance of the enclosure material
• Corrosion resistance
• Food contact safety
• Cleanroom performance
• Explosion protection
• Resistance to high-pressure water cleaning (beyond the specific water jet test defined in the standard)
• Long-term weathering or UV resistance
• Mechanical impact resistance

The IP code is a specific test for specific ingress conditions. It is not a general “ruggedness” rating. A buyer who needs protection beyond dust and water ingress must look beyond the IP code for evidence.

Read the Two IP Digits Correctly

The IP code consists of two digits (and optionally a supplementary letter):

First digit (solid protection, 0-6):

• 0: No protection
• 1: Solid foreign objects 50 mm or larger in diameter
• 2: Solid foreign objects 12.5 mm or larger in diameter
• 3: Solid foreign objects 2.5 mm or larger in diameter
• 4: Solid foreign objects 1 mm or larger in diameter
• 5: Dust-protected (limited ingress, no harmful deposits)
• 6: Dust-tight (no ingress of dust)

Second digit (water protection, 0-9):

• 0: No protection
• 1: Dripping water (vertical)
• 2: Dripping water (15° tilt)
• 3: Spraying water
• 4: Splashing water
• 5: Water jets (6.3 mm nozzle, 12.5 L/min, 30 kPa)
• 6: Powerful water jets (12.5 mm nozzle, 100 L/min, 100 kPa)
• 7: Immersion, 0.15-1 m, 30 min
• 8: Continuous immersion, conditions specified by manufacturer
• 9: High-pressure, high-temperature water jets from multiple angles (defined in IEC 60529 Clause 14.2.9, added in Amendment 2:2013)
• 9K: A separate code from the road vehicle standard ISO 20653 (originally DIN 40050-9), not part of IEC 60529. The “K” supplementary letter indicates a road vehicle test with different pressure, temperature, and nozzle parameters than IEC 60529's digit 9. IPX9 and IPX9K are not interchangeable; a device rated IPX9 under IEC 60529 has not been tested to the IPX9K conditions of ISO 20653, and vice versa.

Each digit is tested independently. IP65 means dust-tight (6) and water jets (5). It does not mean immersion-resistant (7). IP65 does not provide evidence that the enclosure meets an immersion test; any immersion suitability must be established separately for the specific product and operating conditions.

Which Robot Component Has the Rating?

A robot system has multiple components, each with potentially different IP ratings:

• Robot arm: The main manipulator structure
• Wrist: The end of the arm where the EOAT mounts, often a separate sealed unit
• Controller: The electrical cabinet that houses drives and logic
• Teach pendant: The handheld interface, often the most exposed component
• Connectors: The cable connectors between arm and controller, and between arm and EOAT
• EOAT: The end-of-arm tooling, which may or may not be rated by the robot manufacturer

Arm versus connector versus controller

A common error is to read the robot arm's IP rating and assume it applies to the entire system. The arm may be IP67, but the connector at the wrist may be IP54. The controller may be IP20, which indicates protection against finger access to hazardous parts and against solid foreign objects 12.5 mm in diameter or larger, with no protection against water ingress. Follow the manufacturer's installation instructions for enclosure, location, and environmental requirements. The teach pendant may be IP54. The system's effective protection is limited by the lowest-rated exposed component.

The buyer should request the IP rating for each component separately and identify which components are exposed to the environment in the specific installation. A connector that is inside a sealed cabinet has different exposure than one that is on the robot arm in the washdown zone.

Connectors, Covers, and Installation Conditions

Some IP ratings are conditional. The rating may apply only when:

• Plugs are installed: Unused connector ports may not be rated unless the sealing plugs are properly installed
• Covers are closed: Access panels and maintenance covers must be closed and fastened to the specified torque
• Specific mounting orientation: The rating may depend on the mounting orientation (e.g., a vent that is protected when mounted on a vertical surface but exposed when mounted horizontally)
• Cable glands are properly tightened: The cable entry point is a common ingress path if the gland is not correctly installed

The manufacturer's installation manual defines the conditions under which the IP rating applies. If the installation does not meet these conditions, the rating is void.

What IP54, IP65, and IP67 Do Not Prove

The following are common misconceptions about what IP ratings guarantee:

• IP65 = washdown-ready: No. IP65 tests water jets from a 6.3 mm nozzle at 12.5 L/min and 30 kPa. This is a low-pressure jet. High-pressure washdown (as used in food processing) operates at much higher pressure and flow, and may use hot water and chemicals.
• IP67 = submersible: Only under specific conditions (0.15-1 m depth, 30 minutes, still water). It does not mean the device can operate underwater indefinitely or in moving water. Conversely, a device that has not been formally rated IP67 is not guaranteed to fail if briefly exposed to water; it simply has no certified evidence of immersion resistance.
• IP67 = corrosion-resistant: No. The test uses fresh water. Salt water, chemicals, and cleaning agents may corrode the enclosure even if water ingress does not occur.
• IP65 = chemical-resistant: No. The IP test uses water, not chemicals. Chemical resistance depends on the enclosure material and must be verified separately.

Cleanroom AMR requirements address particle shedding, electrostatic controls and materials that an IP code cannot verify.

Ingress tests vs hygienic or chemical resistance

IP tests verify that dust and water do not enter the enclosure. They do not verify that the enclosure surface is compatible with food contact, resistant to specific chemicals, or suitable for cleanroom use. These require separate certifications and material data:

• Food contact: Requires compliance with regulations such as FDA (US) or EC 1935/2004 (EU) for materials in contact with food
• Chemical resistance: Requires material compatibility data from the enclosure manufacturer for the specific chemicals used
• Cleanroom: Requires particle emission, outgassing, and ESD testing per ISO 14644 or similar standards
• Explosion protection: Requires ATEX, IECEx, or UL hazardous area certification

Explosion-proof AMR selection addresses hazardous-area suitability, which is not established by an IP rating.

Actual Washdown and Cleaning Procedures

In practice, the cleaning process determines whether the robot survives, not the IP rating. Cleaning variables include:

• Water pressure: Protection under conditions beyond those used for the IP test is not established by the rating alone. Check the manufacturer's approved cleaning limits for the specific model and configuration.
• Water temperature: Hot water may soften seals or cause thermal expansion that opens gaps
• Chemical concentration and type: Chlorinated, acidic, or alkaline cleaners may attack seals and metals
• Spray direction and distance: Close-range, high-pressure spray directed at seals is more aggressive than the IP test
• Duration and frequency: Daily cleaning for years is more aggressive than a 30-minute test
• Drying: If water remains on the enclosure, it may penetrate seals over time

The buyer should compare the actual cleaning procedure to the IP test conditions and to the manufacturer's cleaning instructions. If the cleaning procedure exceeds the test conditions, additional protection (shields, covers, relocated components) may be needed.

Food and beverage AMR requirements examine washdown and hygienic operation beyond a robot enclosure ingress rating.

Evidence and Test Reports Buyers Should Request

The buyer should request from the manufacturer:

• IP test report: The actual test report, not just the rating claim, showing the test standard, conditions, and results
• Component-specific ratings: The IP rating for each exposed component, not just the arm
• Installation conditions: The conditions under which the rating applies (plugs, covers, orientation, glands)
• Material data: The enclosure materials and their compatibility with the buyer's cleaning chemicals
• Seal maintenance: The inspection and replacement schedule for seals, gaskets, and cable glands
• Cleaning instructions: The manufacturer's recommended cleaning procedure, including pressure, temperature, and chemical restrictions

If the manufacturer cannot provide this evidence, the buyer cannot assume that the robot will survive in their environment.

The robot technical documentation checklist helps buyers identify the documents supporting a model-specific claim.

Application Examples Without Universal Approvals

The following scenarios are illustrative, not prescriptive, and do not represent data from any specific deployment.

• Dusty factory (e.g., woodworking, foundry): IP54 or IP6x may address dust ingress. But abrasive dust may damage seals over time, and conductive dust may enter through connectors. Seal replacement and connector protection may be needed.
• Occasional splash (e.g., general machining): IP54 or IP65 may be adequate if the splash is fresh water at low pressure. But coolant may be chemically aggressive, and the enclosure material must be compatible.
• Repeated washdown (e.g., food processing): No single IP rating can be stated as a universal minimum for every cleaning process. Confirm water pressure, temperature, detergent chemistry, nozzle distance and frequency against the exact product and component test evidence and manufacturer cleaning instructions. Stainless steel enclosure, specific seal materials, and washdown-rated connectors may be required. The manufacturer's washdown procedure must be followed, and buyers should verify that the specific cleaning protocol does not exceed the equipment's rated conditions.
• Chemical cleaning (e.g., pharmaceutical, electronics): IP rating does not address chemical resistance. The enclosure material must be verified for compatibility with the specific cleaning agents.

IP Verification Checklist

The buyer should use the following checklist instead of simply comparing two IP digits: