U.S. imports of Hydrogen Chloride (Hydrochloric Acid) & Chlorosulfuric Acid (SITC 52231) totaled $5.5M in August 2026, imported from 19 countries.
Importers of Hydrogen Chloride (Hydrochloric Acid) & Chlorosulfuric Acid paid $163K in duties in August 2026, an average duty rate of 2.95% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Hydrogen Chloride (Hydrochloric Acid) & Chlorosulfuric Acid imports of $5.5M in August 2026 ran 13% above the year-to-date monthly average of $4.9M.
Last updated: August 2026 dataHydrochloric acid is a foundational industrial chemical used in steel pickling, pH adjustment, and the production of PVC and chlorine compounds, while chlorosulfuric acid serves as a key sulfonating agent in pharmaceuticals and agrochemicals. Both are classified as hazardous materials under DOT regulations, requiring proper placarding, packaging, and safety data documentation at the port of entry. Importers should confirm EPA Toxic Substances Control Act (TSCA) compliance before shipment, as both substances are subject to chemical import certification requirements. Concentration and purity grade are critical classification factors that can affect duty treatment and end-use eligibility.
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446 import shipments a month
Yes. Hydrochloric acid and chlorosulfuric acid are chemical substances subject to TSCA, so importers must submit either a positive certification (confirming compliance) or a negative certification (confirming the substance is not subject to TSCA) at the time of entry.
Purity level and concentration can influence whether a shipment is classified as a technical-grade industrial acid or a higher-purity reagent-grade product. Misclassification between grades can affect applicable duty rates and end-use documentation requirements, so verifying the correct tariff line with a licensed customs broker is advisable.
Basic heading 305 of 465 in section 5
Basic heading 52231 · $5.5M of $27.5B
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Imports · August 2026
origin
Canada and Taiwan together supply 79% of it. South Korea pays 12.5% duty; Canada 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$5.5MYoY · free account
Exports
$1.8MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $59.9M of Hydrogen Chloride (Hydrochloric Acid) & Chlorosulfuric Acid and exported $26.1M.
Through August 2026. Source: U.S. Census Bureau.