Does propylene glycol dissolve plastic? According to Médecins Sans Frontières propylene glycol can dissolve plastic:


  As propylene glycol can dissolve plastic... (Source).


Is this claim true? This seems rather spurious to me. If it matters, for a specific "plastic" I am particularly interested in evaluating the claim in regards to polypropylene and polyethylene as both are materials common for making syringes.
As propylene glycol can dissolve plastic...


This claim is absurd. Propylene glycol cannot dissolve poly(olefin) polymers especially polypropylene or polyethylene. It is possible for glycols to cause paneling of containers made to such, but not dissolve; and certainly wouldn't happen in the amount of time it takes to perform an injection.