Analysis
HTS 2917.39.12 covers 4,4'-(Hexafluoroisopropylidene)bis(phthalic anhydride) under heading 2917 (polycarboxylic acids, their anhydrides, halides, peroxides and peroxyacids; their…).
Rates on the nearby lines range from duty-free to 6.5%. The costliest confusion would be with 2917.39.70 (other: other) at 6.5%, a difference of 6.5 points on the customs value.
There is no general-rate duty on this line, which puts it with roughly 26% of the 1050 tariff lines in chapter 29 that are also free. Free here means free of the base duty only: origin-specific Chapter 99 duties such as Section 301 can still be owed.
Census statistics map these goods to NAICS 325194 (Cyclic Crude, Intermediate, and Gum and Wood Chemical Manufacturing), an industry of 68 US establishments employing 5,542 people, the industry a domestic producer of these goods reports under.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 2917.39.04 | 1,2,4-Benzenetricarboxylic acid, 1,2-dianhydride (Trimellitic anhydride); Phthalic acid; and 4-Sulfo-1,8-naphthalic anhydride | 6.5% |
| 2917.39.08 | Naphthalic anhydride | Free |
| 2917.39.15 | Other: isophthalic acid | 6.5% |
| 2917.39.17 | Tetrabromophthalic anhydride | 6.5% |
| 2917.39.20 | Other: plasticizers | 6.5% |
| 2917.39.30 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2917.39.70 | Other: other | 6.5% |