What is the tonnage threshold for TSCA on adipic acid (hexanedioic acid)?

CDR (Chemical Data Reporting) threshold: 25,000 lb (11,340 kg) manufactured or imported per site per year

CAS 124-04-9 · TSCA · United States of America

Adipic acid (hexanedioic acid) under TSCA

C6H10O4 · 己二酸

Status: Listed. Adipic acid is on the TSCA Inventory as a grandfathered pre-1979 substance and is currently listed as TSCA Active. Light-regulatory profile. **OSHA PEL not specifically established**; ACGIH TLV 5 mg/m^3 8-hr TWA workplace standard applies (verify against https://www.osha.gov/annotated-pels and https://www.cdc.gov/niosh/npg/ before relying). NOT on EPA RMP threshold list. NOT on DEA scheduling. NOT on California Proposition 65 (verify against OEHHA https://oehha.ca.gov/proposition-65/proposition-65-list before relying on negative listing). **TRI Section 313 listed**: Form R annual reporting required where site exceeds thresholds. NO active US AD/CVD case on Chinese-origin adipic acid currently (verify against https://access.trade.gov/ before invoicing; periodic petitions historically). Section 301 List 3 25% additional duty applies on Chinese-origin adipic acid (HS 291712). FDA 21 CFR 184.1009 GRAS for food use. Major US domestic producers (verify each company-site pair against the producer's public website before relying): Invista Victoria Texas, Ascend Performance Materials Pensacola Florida, Solutia / Eastman Chocolate Bayou Texas.

The US adipic acid lane has **light regulatory profile**: NOT on Cal Prop 65, NOT on RMP, NOT on DEA, NO active AD. Section 301 List 3 25% additional duty applies. TRI Form R annual reporting plus EPA GHG Reporting Program N2O coverage are the dominant practitioner overhead. Major US producers: Invista Victoria Texas, Ascend Performance Materials Pensacola Florida, Solutia / Eastman Chocolate Bayou Texas. US is comparatively self-sufficient through domestic supply integrated with cyclohexane plus nitric acid batch 40 chain. **Adipic acid distinguishing pattern in US lane**: light regulatory stack like ethyl acetate batch 23 plus n-butyl acetate batch 24, but with TRI plus N2O GHG layer added; nylon 6,6 chain dominates downstream demand structurally.

Listing and threshold

Substance	Adipic acid (hexanedioic acid) (CAS 124-04-9), C6H10O4
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

Classifications under this regime

OSHA Hazard Communication Standard (HCS): GHS H315 / H319 / H335
OSHA PEL: not specifically established
NIOSH REL: not specifically established (ACGIH TLV 5 mg/m^3 commonly applied)
NOT subject to TSCA Section 6 Risk Evaluation
NOT on TSCA Section 5(a)(2) Significant New Use Rule list
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)
**TRI Section 313 listed**: Form R annual reporting required where site exceeds thresholds
DOT hazardous materials regulation (49 CFR 172.101): not regulated as DG (solid)
IARC: not classified
FDA 21 CFR 184.1009 GRAS for food use as acidulant; FDA 21 CFR 175 plus 177 indirect food-additive applications

Restrictions and conditions of use

No TSCA Section 6 use restrictions
OSHA-compliant SDS and workplace HazCom training required
NO active US AD/CVD case on Chinese-origin adipic acid currently
Section 301 List 3 25% additional duty applies on Chinese-origin adipic acid (HS 291712)
**TRI Form R annual reporting** for facilities above thresholds
EPA Greenhouse Gas Reporting Program (40 CFR Part 98 Subpart V): N2O emissions from adipic-acid producers reportable (verify subpart letter against https://www.ecfr.gov/current/title-40/part-98 before relying)
FDA 21 CFR 184.1009 GRAS approval for food use

Importer obligations

TSCA is a self-certification regime: importers attest at customs entry that the substance is on the TSCA Inventory. The dominant practitioner-facing layer is **TRI Form R annual reporting + Section 301 List 3 25% additional duty + FDA GRAS food-grade conformity for downstream food applications**. NO active AD/CVD case so no AD margin documentation. Major US domestic producers: Invista Victoria Texas, Ascend Performance Materials Pensacola Florida, Solutia / Eastman Chocolate Bayou Texas (verify each company-site pair against the producer's public website before relying).

Required documents

TSCA Section 13 Import Certification statement on customs entry
OSHA-compliant SDS reflecting H315 / H319 / H335 classification
Customs entry CBP Form 7501 with HS code 291712 (adipic acid) and Section 301 List 3 25% duty applied
TRI Form R annual report (where site exceeds 25,000 lb manufacture / 10,000 lb other-use thresholds)
CDR filing every 4 years if site exceeds 25,000 lb/yr threshold
FDA 21 CFR 184.1009 GRAS conformity declaration for food-grade lots
EPA GHG Reporting Program documentation for upstream-producer N2O emissions (covered by producer; relevant where importer obtains adipic acid from US producer)

Common compliance traps

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

**Light-regulatory profile**: NOT on Cal Prop 65, NOT on RMP, NOT on DEA, NO active AD
**TRI Form R annual reporting** for site-level Form R compliance
**EPA GHG Reporting Program N2O emissions** for upstream-producer plants (40 CFR Part 98)
NO active US AD/CVD case on Chinese adipic acid currently
Section 301 List 3 25% additional duty applies; structurally lighter than caprolactam batch 14 + acetic acid batch 19 lanes
Major US producers: Invista Victoria Texas, Ascend Performance Materials Pensacola Florida, Solutia / Eastman Chocolate Bayou Texas
US is comparatively self-sufficient for adipic acid through Invista plus Ascend domestic supply (verify with ICIS or S&P Commodity Insights before quoting structural balance)
**Nylon 6,6 chain primary downstream**: nylon 6,6 is engineering-plastic and tyre-cord chain (sister to caprolactam batch 14 nylon-6 chain)

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for adipic acid (hexanedioic acid), see the CAS 124-04-9 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the adipic acid (hexanedioic acid) 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.

Cross-jurisdiction profile and sourcing references

Referenced in

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