'■ Test method1) Cover a half of test sample by black conductive tape2) Put the sample into chamber in condition: UV 60±3oC 4hr → Condensation 50±3oC 4hr (1CYCLE) in 12 CYCLES (Irradiance 0.89W/m²)3) Take out the sample from chamber and leave in room temperature for 4hr4) Firstly inspect by nake eyes, then using spectrophotometer to measure color difference before and after test