Oxidative Microcracking of ABS in Indoor Air
Persistence Regime: Environmental
Assumption under test
Uncoated ABS does not undergo catastrophic cracking or embrittlement under ordinary indoor atmospheric exposure.
Irreversible physical mechanism
Slow oxidation from ozone and ambient pollutants accumulates subsurface damage, producing irreversible cracking and brittle failure.
Why persistence timescales are required
Accelerated or clean-air testing fails to reproduce cumulative pollutant exposure experienced in real indoor environments.
MVP persistence experiment
- Uncoated ABS bars
- Exposure in ordinary office or urban indoor air
- Ambient temperature and humidity
- Duration: 3–5 years
Binary kill condition
Visible surface cracking or brittle fracture in standardized impact test.
Estimated probability
0.65–0.8