What are the differences in solvent resistance between PVC and polypropylene?

When comparing PVC (polyvinyl chloride) and polypropylene (PP) in terms of solvent resistance, several key differences emerge. PVC is known for its excellent resistance to oils, acids, and alkalis, making it suitable for chemical storage and piping. However, it can degrade when exposed to ketones, esters, and some chlorinated hydrocarbons.

Polypropylene, on the other hand, offers superior resistance to a broader range of solvents, including acids, bases, and organic solvents like alcohols and detergents. Its non-polar nature makes it less susceptible to swelling or dissolving in many chemicals. However, PP is vulnerable to strong oxidizers and aromatic hydrocarbons.

In industrial applications, PVC is often chosen for its cost-effectiveness and rigidity, while polypropylene is preferred for its lightweight, flexibility, and broader chemical compatibility. Understanding these differences helps in selecting the right material for specific solvent exposure conditions.