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Failure Mechanism Of Damp Heat Test

Test parameters

Main influence

Typical failure results

High relative humidity

Moisture absorption or adsorption; expansion; mechanical strength reduction; chemical reaction; corrosion; electrical corrosion; the conductivity of the insulator increases.

Physical damage, insulation failure, mechanical failure.

Low relative humidity

Drying; embrittlement; reduced mechanical strength; shrinkage; increased wear between moving contacts.

Mechanical failure, cracking.


Damp Heat Storage

The damp heat test is primarily intended for component type specimens, to determine, in an accelerated manner, the resistance of specimens to the deteriorative effects of high temperature/humidity and cold conditions. The advantages of this method are its rapidity of application and that it utilizes convection heating; it therefore minimizes degradation due to radiation from heated surfaces. This test method is not intended for the determination of long-term degradation under humid environments (at least not until the specimen shows signs of decomposition).

Test Capability of ORT Damp Heat Test

Test Capability of ORT Damp Heat Test

Damp heat test capability parameters: 10℃~98℃@10%RH~98%RH

Constant heat and humidity (unsaturated high pressure steam) capacity parameters:

Air pressure range: 0.1~0.296Mpa

Temperature range: ≤150℃

Humidity range: 75%RH~100%RH

Applicable standards: GB/T 2423.3, IEC 60068-2-78, GB/T 2423.4, IEC 60068-2-30, GB/T 2423.50, IEC 60068-2-67, GB/T 2423.40, IEC 60068-2-66 , MIL-STD-810H, MIL-STD-883K, MIL-STD-202G, GJB 150A, GJB 360B, GJB 548B, GB/T 28046.4, ISO 16750-4, YD/T 2379, ETSI 300 019-2, GR -63, GR-487, etc.


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