U.S. imports of 1,2,4-Benzenetricarboxylic Acid, 1,2-Dianhydride (Trimellitic Anhydride); Naphthalic Anhydride; Phthalic Acid; and 4-Sulfo-1,8-Naphthalic Anhydride (HS 2917390400) totaled $1.9M in August 2026, imported from 5 countries.
Importers of 1,2,4-Benzenetricarboxylic Acid, 1,2-Dianhydride (Trimellitic Anhydride); Naphthalic Anhydride; Phthalic Acid; and 4-Sulfo-1,8-Naphthalic Anhydride paid $716K in duties in August 2026, an average duty rate of 38.16% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. 1,2,4-Benzenetricarboxylic Acid, 1,2-Dianhydride (Trimellitic Anhydride); Naphthalic Anhydride; Phthalic Acid; and 4-Sulfo-1,8-Naphthalic Anhydride imports of $1.9M in August 2026 ran 11% below the year-to-date monthly average of $2.1M.
Last updated: August 2026 dataAverage import price $3.22/kg · 22 import shipments a month
Statistical number 4 of 9 in subheading 291739
Statistical number 2917390400 · $1.9M of $23.4M
Imports
Imports
$1.9MYoY · free account
Low of 8 reported months · imports
Low · free accountThrough August 2026 · imports 8 of 12 months reported. Source: U.S. Census Bureau.
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Imports · August 2026
origin
China and Italy together supply 96% of it. China pays 43.9% duty; Canada 0.0%.
customs district
None recorded for this period.
destination
Census publishes state breakdowns to the 6-digit level only. See HS 291739 for those.
entry
Census publishes port breakdowns to the 6-digit level only. See HS 291739 for those.
rate provision · imports
None recorded for this period.