How does polypropylene’s resistance to chemical corrosion compare to HDPE?

Polypropylene (PP) and High-Density Polyethylene (HDPE) are both widely used plastics known for their durability and resistance to chemicals. However, their performance in corrosive environments differs due to their molecular structures.

Polypropylene offers excellent resistance to a broad range of acids, bases, and solvents, making it suitable for chemical storage tanks and laboratory equipment. Its semi-crystalline structure provides stability against aggressive substances, though it may degrade under prolonged exposure to strong oxidizers.

HDPE, while also chemically resistant, performs better against certain polar solvents and alcohols due to its higher density and tighter molecular packing. However, it is less resistant to aromatic hydrocarbons compared to PP.

In summary, PP generally outperforms HDPE in resisting non-polar solvents and harsh chemicals, while HDPE excels in environments with polar solvents. The choice between the two depends on the specific chemical exposure and application requirements.