Understanding the IP Code: A Guide to Water Protection Levels

In industrial production, particularly for electronic and electrical products designed for outdoor applications, the enclosure's resistance to dust and water ingress is critically important. This performance is verified using specialized rain spray test chambers and quantified by the International Protection Marking system, commonly known as the IP Code. The IP Code is an 

international standard that classifies and rates the degree of protection provided by mechanical casings and electrical enclosures against intrusion, primarily focusing on solid particle ingress (dust) and water penetration.

What is IP code?

The international standard for quantifying the enclosure integrity of electrical equipment, such as inkjet printers, is the EN 60529 (IEC 60529) standard. This standard establishes the Ingress Protection (IP) Rating System, which provides standardized protection levels against the intrusion of solid foreign objects (e.g., tools, fingers, dust) and harmful effects caused by water ingress (e.g., condensation, splashing, immersion). Professional rain spray test chambers accurately simulate these water exposure conditions to validate product waterproof performance.

 The two digits following the IP code designate the enclosure's level of protection against solid foreign objects and water ingress. The first digit indicates the degree of protection against access to hazardous parts and the intrusion of solid foreign objects, while the second digit specifies the enclosure's degree of protection against harmful effects of water ingress. In both cases, a higher numerical value corresponds to a greater level of protection.

For example: For protection rating IP54, "IP" is the designation code, "5" is the first characteristic numeral, and "4" is the second characteristic numeral. The first characteristic numeral indicates the degree of protection against access to hazardous parts and the intrusion of solid foreign objects, while the second characteristic numeral specifies the degree of protection against water ingress. The specific protection levels represented by these two numerals are detailed in the following table:

Additionally, when the required protection level exceeds that indicated by the above characteristic digits, the extended range is expressed by appending suffix letters after the first two digits. These suffix letters must also meet their respective requirements.

Detailed Classification of IP Water Resistance Ratings

The following waterproof rating reference standards comply with internationally applicable standards such as IEC 60529, DIN 40050-9, ISO 20653, and ISO 16750:

1．Scope: Water resistance testing covers the second characteristic digit ranging from 1 to 8, corresponding to protection rating codes IPX1 through IPX8

2．Waterproof Testing Requirements for Each Rating Level: The IP protection rating is an international standard measuring the degree of protection provided by electrical equipment enclosures against solid foreign objects and water ingress. Each rating level corresponds to specific test methods and conditions to ensure the equipment achieves the intended level of protection during actual use

The following is a detailed analysis of the test methods for different IPX ratings:

IPX1: Vertical Drip Test

Rain Spray Test Chamber: Includes drip test apparatus.

Sample Placement: Place the sample in its normal operating position on the rotating sample platform within the rain spray test chamber, with the top no more than 200mm from the drip nozzle.

Test Conditions: Drip rate of 1.0 ± 0.5 mm/min for 10 minutes. 

IPX2: 15° Tilted Drip Test

Rain Spray Test Chamber: Includes drip test apparatus.

Sample Placement: Place the sample in the waterproof test chamber at a 15° tilt, with the distance from the top to the drip nozzle not exceeding 200mm. After testing one surface, rotate to another surface. Repeat for a total of four surfaces.

Test Conditions: Drip rate of 3.0 ± 0.5 mm/min, sustained for 4 × 2.5 minutes, totaling 10 minutes.

IPX3: Rain Test

Swinging Arm Spray Test:

Rain Spray Test Chamber: Includes a swinging arm spray and splash test apparatus.

Sample Placement: Sample platform height positioned at swing arm diameter level, distance from top to sample spray nozzle ≤200mm, sample platform stationary.

Test Conditions: Water flow calculated based on swing arm nozzle count, 0.07 L/min per nozzle. Swing arm oscillates 60° on either side of vertical axis, each swing lasting approx. 4 seconds, for 10 minutes total. Sample rotates 90° after 5 minutes.

Test Pressure: 400 kPa.

Spray Nozzle Water Test:

Test Equipment: Rain spray test chamber equipped with a handheld spray/splash test device.

Sample Placement: The parallel distance from the top to the handheld spray nozzle outlet shall be between 300 mm and 500 mm.

Test Conditions: Water flow rate is 10 L/min.

IPX4: Splash Test

Swinging Nozzle Splash Test:

Rain Spray Test Chamber and Sample Placement: Same as IPX3.

Test Conditions: Water flow rate calculated based on the number of spray nozzles on the swing arm, 0.07 L/min per nozzle. The spray area covers the arc segments of 90° on either side of the swing arm's midpoint, where nozzles direct water toward the sample. The swing arm oscillates 180° to either side of the vertical line, with each oscillation lasting approximately 12 seconds, for a total duration of 10 minutes.

Spray Nozzle Splash Test:

Rain Spray Test Chamber: Includes a handheld water spray and splash test device.

Sample Placement: The parallel distance between the top of the sample and the spray nozzle outlet shall be between 300mm and 500mm.

Test Conditions: Water flow rate is 10L/min. Test duration is calculated based on the outer surface area of the tested sample, at 1 minute per square meter, with a minimum of 5 minutes.

IPX4K: Pressurized Oscillating Spray Test

Rain Spray Test Chamber and Sample Placement: Same as IPX3.

Test Conditions: Water flow rate calculated based on the number of spray nozzles on the oscillating arm, 0.6±0.5 L/min per nozzle. The spray area covers the arc segments of 90° on either side of the arm's midpoint where nozzles direct water toward the sample. The arm oscillates 180° to either side of the vertical line, with each oscillation lasting approximately 12 seconds. The test continues for 10 minutes, with the sample rotated 90° after 5 minutes.

Test pressure: 400 kPa.

IPX5: Water Jet Test

Rain Spray Test Chamber: The nozzle's water jet outlet has an inner diameter of 6.3 mm.

Test Conditions: The sample is positioned 2.5 to 3 meters from the water jet outlet. Water flow rate is 12.5 L/min. Test duration is calculated based on the outer surface area of the tested sample, at 1 minute per square meter, with a minimum of 3 minutes.

IPX6: Powerful Water Jet Test

Rain Spray Test Chamber: The nozzle's water jet outlet has an inner diameter of 12.5mm.

Test Conditions: The sample is positioned 2.5 to 3 meters from the water jet outlet. Water flow rate is 100L/min. Test duration is calculated based on the outer surface area of the tested sample, at 1 minute per square meter, with a minimum of 3 minutes.

IPX7: Short-term Immersion Test

Rain Spray Test Chamber: Immersion Test Chamber.

Test Conditions: The distance from the bottom of the sample to the water surface must be at least 1 meter, and the distance from the top of the sample to the water surface must be at least 0.15 meters. The test duration is 30 minutes.

IPX8: Continuous Immersion Test

Test Conditions and Duration: To be agreed upon by both parties, with a level of severity exceeding that of IPX7.

IPX9K: High-Pressure Spray Test

Rain Spray Test Chamber: The nozzle's spray outlet has an inner diameter of 12.5 mm.

Test Conditions: Spray angles 0°, 30°, 60°, 90°; 4 spray nozzles; sample platform rotation speed 5 ± 1 rpm; distance 100–150 mm; 30 seconds per position; flow rate 14–16 L/min; spray pressure 8000–10000 kPa; water temperature 80 ± 5°C.

Test duration: 30 seconds per position × 4 positions = 120 seconds total.

TEMAK has delivered a IPX9K test system to NAST in 2025.

TEMAK Rain Spray Test Chamber covers all mainstream IP waterproof ratings:

TEMAK Rain Spray Test Chamber: Specializes in conducting IPX1 to IPX6, as well as IPX4K, IPX6K, and IPX9K rating tests. The equipment offers high flexibility, enabling customized testing procedures compliant with industry standards such as R.S. and SAE to meet specific client requirements, including special testing demands in automotive and military sectors.

TEMAK Immersion Test Chamber: Specializes in high-pressure submersion testing for IPX7 (short-term immersion) and IPX8 (continuous submersion). Featuring a robust chamber structure and exceptional sealing performance, it simulates stable pressure environments corresponding to varying water depths, verifying product seal integrity under real-world immersion scenarios.

Advanced Water Filtration System:

Incorporates multiple high-precision water filtration cartridges to effectively remove particulates, calcium/magnesium ions, and other impurities. This prevents nozzle clogging, ensures stable water pressure and flow, significantly reduces scale buildup, and extends the lifespan of core water circuit components and the entire system.

Intelligent Water Circulation and Drainage Modes:

The system offers two switchable modes: “Automatic Drainage” and “Internal Circulation”.

The Automatic Drainage mode is ideal for continuous testing or scenarios with stringent water quality requirements, ensuring fresh water is used for each test.

The Internal Circulation mode significantly conserves water resources and reduces long-term operational costs, making it particularly suitable for users requiring extended reliability testing.

Automated and Intelligent Testing Upgrade:

This system seamlessly integrates with a high-precision robotic arm. Through pre-programming, the robotic arm precisely controls the relative position and angle between the nozzle and the sample, enabling comprehensive, dead-angle-free automatic spraying on complex-shaped specimens. This feature completely eliminates uncertainties caused by manual operation, significantly enhancing testing efficiency and result consistency—a crucial step toward Industry 4.0 intelligent testing.

The TEMAK Rain Spray and Immersion Test Chamber is your reliable partner for enhancing product quality reliability, accelerating R&D processes, and ensuring compliance with global standards.