CHEMICAL RESISTANCE CHART

(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 - cm - cm Hg x 100
20 C = 68 F
50 C = 122 F

KEY:

Note: Polycarbonate (bullet-proof glass) does not hold up well to continuous contact with Hydrogen. Some water traps are made of polycarbonate.

Do NOT necessarily trust this chart. Variables are such that compatibility tests should be run on any materials before use.



"Water contracts up to 3.98 C and then expands from there. It is one of only a very few substances with a negative coefficient of volume expansion at some temperatures."