Hi, Rudy

In your message you were saying
 
In theory, Polypropylene is resistant to ANY CHEMICAL at temperatures below
about 150 F, but the plasticizers, most of which are from the class of
organics called "esters", can be a big problem, especially in strong alkaline
solutions.

I have a little doubt about that

@ 70 F and 48 hours study shows that  at least following chemicals are considered to have severe damage on polypropylene:
Benzene
Carbon Tetrachloride
Cyclohexane
Dichloroethane
Ether
Nitric acid 72%
Petrolatum

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