Highly Accelerated Temperature and Humidity Stress Test Technique (HAST)

A method for highly accelerated bias-temperature humidity stress testing is described. This method allows testing in the regime 100°C/175°C and 50% R.H./85% R.H. Experimental results which demonstrate invariance of corrosion failure modes and lognormal sigmas under different high temperature-humidity conditions are presented. Acceleration factors relative to 85°C/81% R.H. and 60°C/81% R.H. stress tests are given.