Rainfall experiment

Rainfall Experiment Services for Global Product Reliability and IP Code Verification

As an ISO/IEC 17025 accredited laboratory, we deliver comprehensive rainfall experiment services that simulate natural precipitation, wind-driven rain, and high-pressure water spray to validate the water ingress protection, operational reliability, and long-term durability of your products. Our rainfall experiment capabilities support manufacturers and exporters of outdoor electronics, automotive components, building materials, and military equipment who must demonstrate compliance with IEC 60529, ISO 20653, MIL-STD-810, and regional environmental testing standards across the European Union, North America, and Asia. Every test is conducted under our CNAS-accredited quality system, producing reports accepted by notified bodies, vehicle OEMs, and defense procurement agencies worldwide.

Product Samples We Regularly Test in Our Rainfall Experiment Laboratory

• Outdoor electrical enclosures and cabinets — telecom base stations, power distribution boxes, and traffic control cabinets
• Automotive lighting and sensor housings — headlamps, tail lamps, LiDAR, camera modules, and ultrasonic sensors
• Portable electronic devices — rugged tablets, smartphones, wearables, and outdoor GPS units
• Building facade and window systems — curtain walls, skylights, and roof windows
• Industrial connectors and cable assemblies — for renewable energy, marine, and off-highway applications
• Military and aerospace equipment — field radios, weapon sights, and external aircraft pods
• Marine navigation and deck equipment — radar housings, searchlights, and exposed instrumentation

Standardized Ingress Protection Testing for Simulated Rainfall

• IPX1 vertical drip test per IEC 60529 and EN 60529 — the specimen is mounted on a turntable rotating at 1 rpm beneath a drip box that produces a uniform rainfall of 1 mm/min for 10 minutes, verifying protection against vertically falling water drops as encountered in condensation-prone environments.
• IPX2 tilted drip test per IEC 60529 — the enclosure is fixed in four positions tilted at 15 degrees from vertical and subjected to the same 1 mm/min rainfall for 2.5 minutes per position, simulating dripping water when the equipment is mounted at an angle.
• IPX3 spray and rainfall test per IEC 60529 — using an oscillating spray nozzle or a spray bar with counterbalanced nozzles, the product is sprayed with water at a rate of 10 L/min and a pressure of 50–150 kPa for a minimum of 5 minutes, reproducing a moderate rain shower from any direction up to a 60° angle from vertical.
• IPX4 splash and wind-driven rain test per IEC 60529 — the same oscillating tube or spray nozzle applies water from all directions with a flow rate of 10 L/min at 50–150 kPa for at least 5 minutes, simulating wind-driven rain and splashing water that outdoor equipment must endure.
• IPX5 water jet test per IEC 60529 — a 6.3 mm diameter nozzle delivers a water jet at a flow rate of 12.5 L/min and a pressure of approximately 30 kPa from a distance of 2.5 to 3 meters, testing the product's resistance to heavy rain and hose-directed water for at least 3 minutes.
• IPX6 powerful water jet test per IEC 60529 — using a 12.5 mm nozzle with a flow rate of 100 L/min and a pressure of approximately 100 kPa, the enclosure is subjected to powerful jets from all directions for at least 3 minutes, representing torrential rainfall, wave overtopping, and high-pressure washdown.

Automotive-Specific Rainfall Experiment Services

• ISO 20653 water protection for road vehicle electrical equipment — testing to the automotive standard covering IPX4K and IPX9K, where IPX4K employs a specified spray pattern at elevated pressure, and IPX9K uses a high-pressure flat jet nozzle at 80–100 bar and 80 °C water temperature to simulate steam-jet cleaning and extreme weather driving conditions.
• Wind-driven rain simulation for exterior body seals and closures — a vehicle door, trunk, or panoramic roof assembly is mounted in a test fixture and subjected to a precisely controlled air pressure differential while water is sprayed onto the seal line, verifying that no water penetrates the passenger or luggage compartment under highway-speed driving in heavy rain.
• Headlamp and rear lamp internal fogging and water ingress — the lamp assembly is operated through heating and cooling cycles while exposed to a water spray environment to evaluate the effectiveness of the ventilation membrane and sealing system in preventing internal condensation and standing water.
• Windshield and glass bonding water leak detection — after the rainfall exposure, the vehicle interior is inspected for water traces, and the urethane adhesive bead is sectioned to verify that no capillary water paths have formed along the glass-to-body joint.

Military and Severe Environment Rainfall Experiment Services

• MIL-STD-810H Method 506.6 rain test — the materiel is exposed to a rainfall rate of 1.7 mm/min or higher with simultaneous wind applied at velocities up to 18 m/s, as specified by the procurement agency. The test verifies that tactical equipment can be operated, transported, and stored without loss of function due to rain penetration or surface water accumulation.
• MIL-STD-810H Method 512.6 immersion and fording simulation — for equipment that must survive temporary immersion during river crossings or wave action, the product is submerged under a defined head of water, with a pressure equalization test and a leak rate measurement following the rainfall and spray sequence.
• RTCA DO-160 Section 10 waterproofness for airborne equipment — the avionics unit is subjected to a controlled water spray or rainfall condition appropriate to the aircraft zone classification, followed by a dielectric test and a visual inspection of internal compartments for any water ingress that could compromise flight safety.
• DEF STAN 00-35 and NATO AECTP-300 climatic testing — rainfall and blowing rain procedures from the UK and NATO defense standards are applied to military vehicle and shelter-mounted equipment, with emphasis on sealing performance after prolonged exposure and mechanical stress.

Customized and Application-Specific Rainfall Experiment Services

• Dynamic driving rain test for building curtain walls and windows per ASTM E331 and EN 12155 — the full-scale wall assembly is mounted in a test chamber and subjected to a water spray at 3.4 L/min·m² while a static or cyclic air pressure differential is applied, maintaining the spray and pressure for a minimum of 15 minutes to identify any water leakage through the joints, gaskets, or glazing seals.
• Combined wind and rain erosion for wind turbine blade leading edges — a rotating arm apparatus or a water jet erosion rig subjects the blade coating or leading-edge protection tape to high-speed water droplet impact, simulating years of rainfall during turbine operation, with mass loss and surface roughness measured at defined intervals.
• Rain erosion of radomes and aircraft transparencies per ASTM G73 — the material specimen is mounted on a whirling arm or subjected to a high-speed water jet to evaluate the resistance of the rain-protective coating or film to pitting, delamination, and loss of electromagnetic transmission properties.
• Packaged product integrity under monsoon and tropical rainfall simulation — the packaged product is placed in a walk-in chamber and exposed to a high-volume water spray from multiple directions, then the packaging is opened and the product inspected for water damage, simulating container unloading and storage in heavy tropical rain.
• Cleaning and washdown resistance for food processing and pharmaceutical equipment — the IPX5 or IPX6 test is combined with a specific cleaning agent spray to verify that the electrical enclosures and sensor housings withstand daily washdown without water ingress or corrosion.

Post-Test Evaluation and Failure Analysis in Our Rainfall Experiment Services

• Visual inspection and water ingress documentation — immediately after the rainfall exposure, the product is opened and all internal surfaces are examined for water droplets, standing water, and moisture trails, with photographic documentation of any ingress points.
• Dielectric strength and insulation resistance post-rain per IEC 60204-1 and IEC 60335-1 — the electrical safety of the rainfall-exposed equipment is verified by a high-voltage withstand test and an insulation resistance measurement to ensure no hazardous shock risk exists after the rain exposure.
• Functional test and performance verification — the product is operated through its full functional sequence to confirm that all mechanical movements, electrical outputs, and communication interfaces remain operational and within specification after the rainfall test.
• X-ray and computed tomography for hidden water damage — when water ingress is suspected but not visually confirmed, CT scanning can detect moisture trapped within connectors, multilayer printed circuit boards, and sealed compartments.
• Seal cross-section and compression set analysis — the gasket or O-ring is removed, sectioned, and examined under a microscope to measure the compression set and to identify any extrusion, twisting, or chemical degradation that compromised the water seal during the rainfall experiment.

Report Recognition and ISO/IEC 17025 Compliance

All rainfall experiment methods described in this program are included within our ISO/IEC 17025 scope of accreditation. Our test reports are accepted by European notified bodies for CE marking and type examination, by automotive OEMs and Tier 1 suppliers referencing ISO 20653 and LV series standards, by military procurement agencies invoking MIL-STD-810 and DEF STAN, and by building authorities and customs agencies across the Middle East, Australia, and Asia. Whether you require a full IP rating qualification for a new enclosure design, a pre-production validation of a revised seal design, or a root cause failure analysis of a field water-damaged unit, our laboratory delivers the measurement accuracy and test realism that global supply chains demand.