Humid Heat Test, constant

Testing with constant moist heat is used to ensure the resistance of the test specimen to defect patterns caused by moist heat. Classic failure modes caused by moist heat are corrosion, swelling and degradation of plastics and sealing and potting compounds. This test is usually performed at 40°C or 55°C and 93% relative humidity. The duration of the test depends on the use of the product and is usually between two and six weeks. These tests are carried out in climatic chambers in which the test specimens are placed. Basic test standards are DIN EN 60068-2-78 and ISO 16750-4. In the automotive standards LV124, VW 80000, GS 95024-3-1 and MBN 10306 this test is known as K-14.