Humidity Resistance
Environmental FOR: Insulation $4,110The humidity resistance test seeks to evaluate the impact of prolonged heat and humidity exposure to wire/cable insulation. This accelerated environmental test is meant to simulate the environmental conditions in Severe Wind and Moisture Prone (SWAMP) areas on aircraft to analyze the possible detrimental effects. A sample is considered to have failed if there has been significant degradation of insulation electrical properties (insulation resistance, dielectric strength, etc.); the particular method for determining pass/fail varies from test specification to specification.
At the end of this test, Lectromec delivers a report on the test conditions, post-humidity exposure test results, and any other observations.
Parameters that can be changed for this test include but are not limited to:
- Temperature
- Humidity
- Mechanical stresses
- Voltage on the specimen
- Post-test evaluation method
- Duration
Procedure
- Perform visual examination of the specimen. Record any defects.
- Perform wet dielectric voltage withstand test. Discard any failed samples.
- (Specification dependent) Place the specimen on a mandrel loaded on each end to keep the specimen taught.
- Place the specimen into the humidity chamber. Leave the specimen in the enclosure for the specified duration.
- Remove the specimen and perform a visual examination. Record any insulation degradation.
- Perform insulation resistance test on the specimen.
- Report the exposure conditions and duration, insulation resistance results, and any observed changes in the specimen.
Covered specifications
- AS22759 Paragraph 5.7.8
- AS4373 Method 603
- AS6070 Method 5.3.3
- AS81044 Method 4.7.5.22
- AS85485 Method 5.15
- EN3475 Method 412
- MIL-DTL-81381 Method 4.6.4.19
- ISO 6722 Method 5.21
- BSS7324 Method 7.03
- CHED-227A Method 4.2.2.2
- SS7614 Method 3.4.25