How do DOP and DOTP compare in performance, cost and regulatory acceptance for PVC applications?

How do DOP and DOTP compare in performance, cost and regulatory acceptance for PVC applications?
DOP and DOTP are molecular isomers—both C8 alcohol esters with similar molecular weight around 390—but the carboxyl position difference drives major performance gaps. DOTP wins decisively on electrical insulation (10^14 vs 10^12 ohm-cm volume resistivity), heat aging (volatile loss under 8% vs 12%), low-temperature flexibility, and migration resistance. It also passes EU RoHS, REACH and FDA food-contact requirements, while DOP faces restrictions. The price gap is modest—roughly 8,500 yuan/ton for DOP versus 9,200 yuan/ton for DOTP in 2026 market conditions. For cable compounds requiring IEC 70°C/105°C ratings, DOTP is effectively mandatory. For general-purpose PVC film, artificial leather and toys where regulatory exposure is low, DOP remains cost-competitive. The structural trend is clear: DOTP surpassed DOP in capacity for the first time in 2026, ending DOP's 60-year dominance.