Standard International Trade Classification
U.S. imports of Hypochlorites, Commercial Calcium Hypochlorite, Chlorites & Hypobromites (SITC 52331) totaled $5.4M in August 2026, imported from 18 countries.
Importers of Hypochlorites, Commercial Calcium Hypochlorite, Chlorites & Hypobromites paid $165K in duties in August 2026, an average duty rate of 3.04% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataCommercial calcium hypochlorite — the granular or tablet form widely used in swimming pool sanitation and municipal water treatment — anchors this group alongside sodium hypochlorite (liquid bleach), chlorites, and hypobromites. Classification hinges on the specific salt and its commercial grade: calcium hypochlorite is distinguished from sodium hypochlorite and from chlorites, each of which may carry different duty treatment. Importers should verify whether a shipment qualifies as "commercial" calcium hypochlorite versus a laboratory-grade or dilute solution, as that distinction drives the correct tariff line. These oxidizing chemicals are also subject to EPA and DOT hazardous-materials regulations governing labeling, packaging, and port handling.
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228 import shipments a month
Commercial calcium hypochlorite is a solid or granular product with a high available-chlorine content sold for industrial or pool use, whereas sodium hypochlorite is typically a liquid solution (bleach). The distinction matters because each falls under a different tariff line within this group; importers should confirm the chemical identity and concentration on the commercial invoice to ensure correct classification.
Calcium hypochlorite is classified as a strong oxidizer under DOT regulations, requiring compliant packaging, labeling, and placarding during transport. EPA may also require compliance with TSCA import certification. Importers should work with a licensed customs broker and a hazmat compliance specialist before shipment.
Basic heading 308 of 465 in section 5
Basic heading 52331 · $5.4M of $27.5B
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Imports · August 2026
origin
Canada and Spain together supply 89% of it. China pays 40.6% duty; Canada <0.1%.
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
$5.4MYoY · free account
Exports
$4.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $59.9M of Hypochlorites, Commercial Calcium Hypochlorite, Chlorites & Hypobromites and exported $44.2M.
Through August 2026. Source: U.S. Census Bureau.