Polyurethane polyol producers typically require propylene oxide with very high purity (often 99.9%+) and strict limits on water content, acidity, and carbonyl impurities, as trace contaminants can disrupt catalyst systems and affect foam or elastomer properties. Importers should request a certificate of analysis aligned with the buyer's process specification before finalizing supply agreements.

Propylene oxide has been subject to antidumping and countervailing duty investigations in various markets globally. US importers should monitor the USITC and Commerce Department dockets for any active or sunset review proceedings that could affect duty liability, and consult a licensed customs broker to confirm current order status before contracting.