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What is reliability testing?

In recent years, with the transition to mobile and digital control, electronic devices are now used in a variety of environments. Products are required to be durable in harsh environments, and it is important to check the reliability of products in many areas to prevent problems in the market, in order to meet the quality required by customers.

Reliability testing of in-vehicle equipment

Reliability for automotive components has been considered from various viewpoints from the extent of the vehicle’s mobility and the area of use. With the recent shift to electrification, the number of electronic devices in automobiles is increased, and electronic devices are now required to be durable enough to withstand the harshness even in places such as engine rooms that are subject to severe vibration, high temperatures and exposure to oil and salt water. In order to evaluate the reliability of automotive components and detect potential defects or vulnerabilities, we perform environmental tests such as temperature, humidity, atmospheric pressure, vibration, shock, waterproofing, dust, and salt, as well durability tests against stresses such as temperature differences, vibrations, and electric voltage surges.

In addition to testing services based on standards, UL is able to provide our testing sites and equipment, customized tests and measurements, and advisory for test items. We also support a wide range of reliability tests except for in-vehicle equipment. To learn more, please contact us.


Humidity and temperature test/Temperature and humidity cycle test

By repeatedly changing the temperature and humidity, this testing service evaluates reliability and durability of the changes. We perform temperature and humidity cycle test (heat cycle test) using temperature and humidity chamber. The chamber adjusts the temperature and humidity, to perform environmental and reliability tests under various temperature and humidity environments. Customized tests, and tests with powered-up and operating are also available.

Equipment: High-power high-temperature thermostat, large thermostatic chamber Standards:
LV124/ISO 16750-4/ISO 19453-4/JASO D 014-4/IEC 60068

Thermal shock test

In thermal shock test, UL evaluates products’ resistance to sudden change of temperature, by exposing products to high temperature and low temperature alternately in a short time. It is also known as thermal cycle testing. Repeated rapid temperature changes cause the test material to expand and contract. Materials with different coefficients of expansion produce stresses due to differences in the rate of expansion, which can cause cracks and fractures when such is repeated. In addition to damper type thermal equipment, this service features an elevator type thermal shock equipment that is used for testing for Europe with high capacity and is faster to reach the set temperature, allowing us to support more demanding environmental tests.

Equipment: High-capacity elevator type thermal shock equipment, thermal shock equipment (damper type), humidity thermal shock equipment (damper type) Standards:
LV124/ISO 16750-4/ISO 19453-4/JASO D 014-4/IEC 60068

Splash Water Test (Ice Water Shock Test)

UL simulates the thermal shock caused by cold water splashing when a vehicle travels on a wet road in winter. For electronic systems and components installed exterior of automotive, we test the impact of thermal shock on both products’ mechanical strength and waterproof performance. In this service, we provide splash water test that apply cold water from 0 to 4 degrees Celsius to the product, and submersion tests that submerge the product in cold water while keeping in operation. We are also able to customize water temperature, depth of water, and liquid type.

Equipment: Splash water Testing equipment Standards:
ISO 16750/JASO D 014-4/Automobile Manufacturer Standards

International Protection (IP) test

For electrical and electronic products, we evaluate water resistance and waterproofing when subjected to outdoor wind, rain, and water splashing, etc. For automotive components, we provide testing service to evaluate waterproofing, water resistance, drainage, and changes in functionality. This service enables water-resistant testing corresponding to IP code. UL is also able to support cycle tests using a thermostatic bath and tests during power-up and while in operation.

Equipment: Water and rain resistance tester (see video for details) Standards:
LV124/IP code (IPX1, X2, X3, X5, X4K, X5, X6, X6K, X7, X8, X9K)/IEC 60529/ISO 20653/JIS D 0203


By integrating the expertise of safety standards, testing ability for safety certification, and the experience of EMC services for automotive components over 15 years, UL offers the reliability testing services for automotive components.

● On Stop Service – Comprehensive testing menu for automotive components: Reliability, EMC, Wireless, etc.
● Wide range of Standards – International standards, Japan / Global automotive manufacturer standards
● Trusted services – Trusted testing and certification services over 100 years

We provide testing service on the following test items.

High and low temperature storage testing Decompression testing Condensation cycle testing
Low-temperature load testing Low-temperature and decompression combined testing Amplitude vibration testing
High-temperature load testing High-temperature and decompression combined testing Random vibration
High temperature and high humidity testing Salt spray testing Combined vibration testing
Temperature and humidity cycle testing Salt spray combined cycle testing Impact testing
Temperature change testing Waterproof testing Bump testing
Thermal shock testing Dust testing Free fall testing
Other customized testing
High-power temperature and humidity chamber Ion migration evaluation system
Thermal shock equipment (elevator type, damper type) Digital microscope
Thermal shock equipment with humidity function (damper type) Drop tester
Vacuum oven / dryer Impact tester
Dust resistance tester (floating type, air flow type) Large thermostatic bath
Water and rain resistance tester Power supply and electric load device
Combined corrosion tester Universal material tester
Combined environmental vibration tester Highly accelerated stress test chamber (HAST CHAMBER)
Conductor resistance evaluation system

Click here for details of testing and equipment specifications (Brochure DL)

高度加速寿命試験 (HAST試験)


保有設備: 高度加速寿命試験装置、イオンマイグレーション評価システム
対応規格: IEC 60068-2-66



高温・低温試験 減圧試験 結露サイクル試験
低温負荷試験 低温・減圧複合試験 正弦波振動試験
高温負荷試験 高温・減圧複合試験 ランダム振動
高温高湿試験 塩水噴霧試験 複合振動試験
温湿度サイクル試験 塩水噴霧複合サイクル試験 衝撃試験
温度変化試験 防水試験 バンプ試験
熱衝撃試験 塵埃試験 自然落下試験