</>Build with Tariff Intelligence|Programmatic access to tariff calculations and HS code classification.Explore Developer Resources →

Diisodecyl Orthophthalate (DIDP) Plasticizer from China

Diisodecyl orthophthalate (DIDP) is a branched-chain phthalate ester used primarily as a high-performance plasticizer for polyvinyl chloride (PVC) resins. It falls under HTS 2917.33.0010 as a specific didecyl orthophthalate derivative within aromatic polycarboxylic acid esters. This chemical compound enhances flexibility and durability in plastics without impurities that would alter its classification.

Duty Rate — China → United States

44%

Rate breakdown

9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China

Import Tips

Verify chemical purity via Certificate of Analysis (CoA) to confirm it meets Chapter 29 definition as a separate chemically defined compound without disqualifying impurities

Include Safety Data Sheet (SDS) and TSCA certification for EPA compliance, as phthalates face regulatory scrutiny under chemical import rules

Avoid misclassification as a mixture; ensure packaging labels it solely as DIDP to prevent reclassification under heading 3824 for chemical preparations