(For Some Common Plastics vs. NaOH or KOH)
| NaOH (50% to Conc) | KOH (Conc) | Max Use Temp (C) | Permeability* | Water Absorption (%) | |||||
|---|---|---|---|---|---|---|---|---|---|
| 20 °C | 50 °C | 20 °C | 50 °C | N2 | O2 | CO2 | |||
| Low Density Polyethylene - LDPE | G | G | E | E | 80 | 20 | 60 | 280 | <0.01 |
| High Density Polyethylene - HDPE | E | E | E | E | 120 | 3 | 10 | 45 | <0.01 |
| Polypropylene - PP | E | E | E | E | 135 | 4 | 25 | 90 | <0.02 |
| Polyallomer - PA | E | E | E | E | 121 | 6 | 30 | 100 | <0.02 |
| Polycarbonate - PC | E | E | N | N | 135 | 3 | 20 | 85 | 0.35 |
| Polyvinyl Chloride - PVC | N | N | E | G | 70 | .5-2 | 1-6 | 10-35 | 0.06 |
| Polysulfone - PSF | E | G | E | E | 165 | 3 | 15 | 60 | 0.30 |
| Polymethylpentene - PMP | E | E | E | E | 175 | 65 | 270 | -- | <0.01 |
| Teflon - FEP | E | E | E | E | 205 | 20 | 60 | 135 | <0.01 |
| Teflon - PFA | E | E | E | E | 250 | -- | -- | -- | <0.03 |
| Halar/Tefzel - ECTFE/ETFE | E | E | E | E | 150 | -- | -- | -- | <0.1 |
| Polystyrene - PS | E | E | G | G | -- | -- | -- | -- | -- |
| Polyvinylidene Fluoride - PVDF | E | G | E | G | -- | -- | -- | -- | -- |
| *Permeability Units: cc - mm / sec - cm² - cm Hg x 100 | 20 °C = 68 °F 50 °C = 122 °F |
KEY:
Do NOT necessarily trust this chart. Variables are such that compatibility tests should be run on any materials before use.