CAS 7783-20-2 · TSCA · United States of America

Ammonium sulfate under TSCA

(NH4)2SO4 · 硫酸铵

Status: Listed. Ammonium sulfate is on the TSCA Inventory as a grandfathered pre-1979 substance and is currently listed as TSCA Active. No PMN is required. AS is regulated by USDA at the state level for fertiliser registration. No DEA scheduling, no EPA RMP threshold listing. **Active US AD/CVD orders on Chinese-origin ammonium sulfate (per Federal Register 9 March 2017, continued April 2023)**: ITC investigations 701-TA-562 (CVD) and 731-TA-1329 (AD), final affirmative determinations 2017 (verified against https://www.usitc.gov/ search); prior dataset drafts cited investigation numbers 731-TA-1389 and case numbers A-570-049 / C-570-050 with a China-wide rate of ~493%, but those specifics could not be confirmed against access.trade.gov in the audit pass. Verify current case-number routing and producer-specific margins against https://access.trade.gov/ before invoicing. Section 301 List 3 25% additional duty applies on top of AD/CVD.

The US AS lane is dominated by active US AD/CVD orders on Chinese-origin product (Federal Register 9 March 2017, continued April 2023). Prior dataset drafts cited specific case numbers (A-570-049 / C-570-050) and rates (10-65% individual, 493% China-wide) but those specifics were unverifiable in the audit pass; verify current case routing and producer-specific margins against https://access.trade.gov/ before invoicing. The combined AD + CVD + Section 301 List 3 25% additional duty stack makes Chinese-origin AS structurally uncompetitive in the US lane vs domestic caprolactam-coupled by-product supply (AdvanSix Hopewell, BASF Geismar). US is comparatively self-sufficient in AS through the caprolactam by-product chain. Annual administrative reviews can adjust producer-specific rates; monitor Department of Commerce filings before invoicing.

Listing and threshold

Substance Ammonium sulfate (CAS 7783-20-2), (NH4)2SO4
Regime US Toxic Substances Control Act (TSCA), administered by EPA
Jurisdiction United States of America
Status Listed
Tonnage threshold CDR (Chemical Data Reporting) threshold: 25,000 lb (11,340 kg) manufactured or imported per site per year triggers reporting in the next CDR cycle

Classifications under this regime

  • NOT subject to TSCA Section 4 test rule
  • NOT currently subject to TSCA Section 6 unreasonable-risk evaluation
  • NOT on the TSCA Section 5(a)(2) Significant New Use Rule list
  • OSHA Hazard Communication Standard (HCS): typically NOT classified as hazardous (dust nuisance only)
  • No substance-specific OSHA PEL; dust falls under the PNOR / nuisance-dust category at 29 CFR 1910.1000 Table Z-1 (PEL 15 mg/m³ total dust, 5 mg/m³ respirable; verify against https://www.osha.gov/annotated-pels/table-z-1)
  • NOT on EPA RMP threshold list
  • NOT on DEA List I or List II
  • NOT on California Proposition 65 list (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before relying on negative listing)
  • USDA AAPFCO (Association of American Plant Food Control Officials) state-level fertiliser registration required
  • EPA Risk Management Plan (RMP) does not apply to AS itself

Restrictions and conditions of use

  • No TSCA-specific use restrictions for AS
  • OSHA-compliant SDS and workplace HazCom training required
  • Active US AD/CVD orders on Chinese-origin ammonium sulfate are confirmed (Federal Register 9 March 2017, continued April 2023 per https://www.federalregister.gov/documents/2023/04/05/2023-07042/) but the specific case numbers and rates cited in prior dataset drafts (A-570-049 / C-570-050, 731-TA-1389, China-wide rate 493%, individual rates 10-65%) could not be corroborated; verify current case routing and producer-specific margins against https://access.trade.gov/ before invoicing
  • Section 301 List 3 25% additional duty applies on top of AD/CVD on Chinese-origin AS (HS 310221)
  • USDA state-level fertiliser registration required (state-by-state varies)
  • EPA Clean Water Act and state-level Nutrient Trading regulations restrict AS runoff in agricultural watersheds
  • OSHA workplace exposure monitoring for inhalation

Importer obligations

TSCA is a self-certification regime: importers attest at customs entry that the substance is on the TSCA Inventory. The TSCA Section 13 Import Certification statement is filed via the customs broker. For AS specifically, the practitioner-facing layer is dominated by the **active US AD/CVD case** (case number unverified at audit (verify access.trade.gov)): producer-specific AD margin verification at customs entry, AD/CVD cash deposit at entry, Customs Form 7501 with AD/CVD case number, and 5-year administrative review record retention. Section 301 List 3 25% additional duty applies on top of AD/CVD. The combined AD + CVD + Section 301 cost layer makes Chinese-origin AS structurally uncompetitive in US lane vs domestic supply (caprolactam-coupled AS at AdvanSix Hopewell, BASF Geismar) and Latin American alternatives (Brazil, Mexico).

Required documents

  • TSCA Section 13 Import Certification statement on customs entry
  • OSHA-compliant SDS (Safety Data Sheet) in 16-section GHS format
  • CDR filing every 4 years if site exceeds 25,000 lb/yr threshold (next cycle 2026)
  • AD/CVD producer-specific margin documentation for Customs Form 7501 entry (verify current case-number routing against https://access.trade.gov/ before relying on prior-draft citations)
  • AD/CVD cash deposit at entry equivalent to producer-specific rate
  • USDA state-level fertiliser registration (state-by-state varies)
  • AAPFCO label compliance: N minimum 21% (granular) or 20.5% (crystalline)

Common compliance traps

The pitfalls that have bitten importers on this lane in the past. None of these is theoretical.

  • Active US AD/CVD orders on Chinese AS are the dominant compliance and cost layer (Federal Register 9 March 2017, continued April 2023). Specific producer-specific margins and China-wide rates cited in prior dataset drafts (10-65% individual, 493% China-wide) were unverifiable in audit; verify current rates against https://access.trade.gov/. AD + CVD + Section 301 List 3 25% additional duty stack makes Chinese-origin AS structurally uncompetitive in US lane
  • AD/CVD periodic administrative reviews (annual) can adjust producer-specific rates upward or downward; monitor Department of Commerce administrative review filings before invoicing volume contracts
  • Coal-fed Chinese ammonia upstream (input to AS via caprolactam by-product chain or direct production) raises Scope 3 carbon concern for some US agricultural buyers
  • AdvanSix Hopewell (Virginia) is largest US domestic AS producer (caprolactam-coupled by-product); BASF Geismar (Louisiana) and Industrial Chemical Inc. are secondary domestic producers
  • US is comparatively self-sufficient in AS (caprolactam-coupled by-product capacity meets most demand); imports are minor in % terms but specialty grades (sulfur-coated, crystalline-grade) flow despite AD/CVD
  • Watershed-specific EPA Clean Water Act regulations (Chesapeake Bay, Mississippi River Delta) restrict AS application in vulnerable agricultural zones
  • AS is preferred over urea in some sulfur-deficient soils (Pacific Northwest, Southeast US clay soils, dryland wheat regions); structural demand pull but supplied largely by domestic caprolactam-coupled by-product

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for ammonium sulfate, see the CAS 7783-20-2 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the ammonium sulfate cornerstone hub covers the full sourcing chain.

For the structure and history of TSCA, see the TSCA glossary entry.

Need cross-jurisdiction compliance support on this substance? Run it through the REACH / TSCA / IECSC / AICIS / K-REACH checker, or send us the substance and the destination and we will quote FOB China and CIF / DDP landed including the regulatory work on the destination side.

Read next

Cross-jurisdiction profile and sourcing references

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