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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.


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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