Indoor Optical Aging of Polysulfone
Persistence Regime: Optical
Assumption under test
Polysulfone maintains color and transparency during years-long indoor daylight exposure.
Irreversible physical mechanism
Slow photo-oxidation from low-intensity light produces permanent color center formation and transmission loss.
Why persistence timescales are required
Accelerated tests do not reproduce cumulative photon dose and oxidative stress typical of indoor environments.
MVP persistence experiment
- PSU sheets mounted behind window glass
- Indirect daylight exposure only
- Ambient indoor conditions
- Duration: 2–4 years
Binary kill condition
Delta E > 3 or >10% loss in light transmission.
Estimated probability
0.7–0.8