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Automotive metal material testing
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Rapid temperature change test
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Common issues with vibration testing
Common issues with fatigue testing
Common issues with high and low temperature testing
Conducted Interference (CE) - Suzhou Lixun Standard
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Voltage flicker test - Suzhou LCS standard
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Introduction to PFAS Testing
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Automotive interior and exterior trim - Environmental testing
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Automotive interior and exterior decorations (electronic and electrical components) - IP protection
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Automotive electronic and electrical components - Electrical performance
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Automotive interior and exterior trims - Mechanical performance testing
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Address: Shenzhen City, Baoan District, Shajing Street, Nga side of the school of Wei Juji Industrial Park, Building A 1 ~ 2 floor, Building C 3 floor
Steady damp-heat
This section of the constant temperature and humidity test is used to determine the effect of a high humidity environment with constant temperature and no condensation within a specified time on the test sample.
Test purpose
Evaluate the tolerance performance of components, equipment, or other products under constant temperature and high humidity (without condensation) environment, and detect the possible performance degradation or failure of materials under humid and hot conditions.
Test Standard
According to the standard:
IEC 60068-2-78: Environmental testing - Part 2: Test methods Cab (constant humidity and heat)
GB/T 2423.3: Environmental Testing for Electrical and Electronic Products (Constant Damp Heat)
MIL-STD-810: Environmental Engineering Considerations and Laboratory Testing
Test Principle
By simulating a constant temperature and high humidity environment, evaluate the tolerance performance of the product under long-term humid and hot conditions, especially the impact of high humidity on the surface and internal structure of the material.
test equipment
Humidity Chamber
Temperature Recorder
Humidity recorder
Sample holder
Assessment tools (microscopes, electrical performance testers, etc.)
Test steps
Sample preparation:
Clean the surface of the sample to ensure that there are no oil stains or other contaminants.
Record the initial state of the sample (taking photos, conducting electrical performance tests, etc.).
If testing packaged samples, ensure that the packaging is intact and undamaged.
Test condition settings:
Temperature: Set according to demand (usually+40 ℃ to+85 ℃).
Humidity: Set according to demand (usually 85% -95% RH).
Testing time: Set according to requirements (usually 48 hours to 1000 hours).
Test Run:
Start the test chamber and adjust the temperature and humidity to the set values.
Place the sample in the test chamber and ensure that the exposed surface is uniformly heated and wetted.
Maintain constant temperature and humidity conditions and continue testing until the set time.
Test completed:
Take out the sample and restore it to a standard environment for 24 hours.
Record the status of the sample after testing (taking photos, conducting electrical performance tests, etc.).
Result evaluation:
Appearance inspection:
Check the sample for corrosion, blistering, cracking, deformation, and other phenomena.
Electrical performance testing:
Evaluate the electrical performance changes of components (such as insulation resistance, dielectric strength, etc.).
Mechanical performance testing:
Evaluate the changes in properties such as tensile strength and impact strength of materials.
Microstructure analysis:
Observe surface microstructural changes using a microscope.
Packaging inspection (if applicable):
Check if the packaging is intact and if there is any water seepage or damage.
Precautions
Ensure the accuracy of temperature and humidity control in the test chamber and avoid deviations in testing conditions.
The sample should be placed evenly to avoid local overheating or excessive humidity.
After the test is completed, the sample needs to be restored to a standard environment before evaluation.
Test Record
Record the testing conditions (temperature, humidity, testing time, etc.).
Record the initial and post test states of the sample (taking photos, conducting electrical performance tests, etc.).
Record the specific manifestations of material performance changes.
Conclusion
Based on the test results, evaluate the product's tolerance performance in a constant humid and hot environment and issue a test report. Through this test, important basis can be provided for product design, material selection, and process improvement, ensuring the reliability of the product in humid and hot environments.
Large-scale experimental base
Professional Lab
Analysis Method
Testing/year
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