Exposure to ultraviolet light

Profiles and siding used in building exterior components need to resist discolouration and deterioration due to heat and UV radiation. Experimental results show that “Durastream” is more resistant to discolouration than competitor products, even when exposed to direct sunlight and heat. CPVC compound “Durastream” is a product that can replace many thermoplastics commonly used in outdoor applications.

Evaluation Condition

Test Equipment	UV Long Life Fade Meter
Room Temperature	40 °C (104 °F)
Panel Temperature	63 °C (145 °F)
Evaluation Time	500 Hours (Every 100 Hours, Sampling)

Test Results

Test of Impact Strength

Continued exposure to UV radiation generally damages thermoplastics. Materials not only discolour, but also become brittle and prone to breakage.

Impact resistance retention (IZOD) is an excellent way to measure and compare the degree of degradation and structural integrity of different materials. This test simulates continuous exposure to sunlight. Higher retention means less degradation and higher impact strength.

The test results show that compared to competitive products, “Durastream” is able to maintain its impact strength under continuous sunlight.

Test Condition

Test Equipment	UV Long Life Fade Meter
Room Temperature	40 °C (104 °F)
Panel Temperature	63 °C (145 °F)
Evaluation Time	500 Hours (Every 100 Hours, Sampling)