CAS 471-34-1 · TSCA · United States of America

Calcium carbonate (GCC / PCC / limestone) under TSCA

CaCO3 · 碳酸钙

Status: Listed. Calcium carbonate is on the TSCA Inventory and currently listed as TSCA Active. **OSHA PEL for limestone (CAS 1317-65-3) at 29 CFR 1910.1000 Table Z-1: 15 mg/m3 total dust and 5 mg/m3 respirable fraction (verify against https://www.osha.gov/annotated-pels before relying; calcium carbonate may share equivalent particulate-dust handling logic).** 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). NO active US AD/CVD case on Chinese-origin calcium carbonate currently (verify against https://access.trade.gov/ before invoicing). Section 301 List 3 25% additional duty applies on Chinese-origin calcium carbonate (HS 251710 / 283650) (verify against current USTR Section 301 schedule before invoicing). **Food-grade GRAS** under 21 CFR 184.1191 (verify against https://www.ecfr.gov/ before relying); USP / NF monograph applies for pharma-grade. Major US domestic producers (verify each company-site pair against the producer's public website before relying): Imerys Roswell Georgia GCC operations, Omya Cincinnati Ohio plus Lucerne Valley California GCC and PCC operations, Specialty Minerals (Minerals Technologies) Adams Massachusetts plus Bethlehem Pennsylvania PCC operations, Mississippi Lime Company Ste. Genevieve Missouri lime / GCC operations.

US calcium carbonate lane: **OSHA PEL for limestone particulate dust + Section 301 List 3 + GRAS / USP / NF for food-grade and pharma-grade**. NOT on Cal Prop 65. NO active US AD/CVD case. Major US producers: Imerys (Georgia), Omya (Ohio plus California), Specialty Minerals / MTI (Massachusetts plus Pennsylvania), Mississippi Lime (Missouri).

Listing and threshold

Substance Calcium carbonate (GCC / PCC / limestone) (CAS 471-34-1), CaCO3
Regime US Toxic Substances Control Act (TSCA), administered by EPA
Jurisdiction United States of America
Status Listed
Tonnage threshold CDR threshold: 25,000 lb manufactured or imported per site per year

Classifications under this regime

  • OSHA HCS: NOT typically classified as hazardous beyond particulate dust
  • OSHA PEL for limestone (CAS 1317-65-3) at 29 CFR 1910.1000 Table Z-1: 15 mg/m3 total dust + 5 mg/m3 respirable (verify against https://www.osha.gov/annotated-pels)
  • NOT subject to TSCA Section 6 Risk Evaluation
  • NOT on EPA RMP threshold list
  • NOT on DEA List I or List II
  • NOT on California Proposition 65 list (verify against OEHHA before relying on negative listing)
  • DOT 49 CFR 172.101: NOT regulated
  • **Food-grade GRAS** 21 CFR 184.1191 (verify against https://www.ecfr.gov/)
  • **USP / NF monograph** applies for pharma-grade
  • IARC: Not classified

Restrictions and conditions of use

  • NO active US AD/CVD case on Chinese-origin calcium carbonate currently
  • Section 301 List 3 25% additional duty applies on Chinese-origin calcium carbonate (HS 251710 / 283650)
  • OSHA PEL for limestone particulate dust applies
  • Food-grade GRAS 21 CFR 184.1191 plus USP / NF monograph for pharma-grade

Importer obligations

TSCA self-certification regime. Major US producers (verify each producer-site pair before relying): Imerys Roswell Georgia, Omya Cincinnati Ohio plus Lucerne Valley California, Specialty Minerals (Minerals Technologies) Adams Massachusetts plus Bethlehem Pennsylvania, Mississippi Lime Company Ste. Genevieve Missouri.

Required documents

  • TSCA Section 13 Import Certification on customs entry
  • OSHA SDS (with limestone particulate-dust handling notes)
  • CBP Form 7501 with HS 251710 or 283650 + Section 301 List 3 25% duty
  • CDR filing every 4 years
  • FDA / USP / NF certifications for food and pharma grades

Common compliance traps

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

  • OSHA PEL for limestone particulate dust: 15 mg/m3 total + 5 mg/m3 respirable
  • NO active US AD/CVD case on calcium carbonate itself
  • Section 301 List 3 25% additional duty applies
  • Food-grade GRAS 21 CFR 184.1191 plus USP / NF monograph for pharma-grade
  • Major US producers: Imerys Roswell GA, Omya Cincinnati OH + Lucerne Valley CA, Specialty Minerals Adams MA + Bethlehem PA, Mississippi Lime Ste. Genevieve MO (verify each producer-site pair)

Where to read next

For substance-level identifiers (formula, molecular weight, SMILES, InChIKey), GHS hazard profile, IMDG transport class, and full sourcing reference for calcium carbonate (gcc / pcc / limestone), see the CAS 471-34-1 sourcing reference.

For grade-by-grade buying notes, freight maths, supplier-tier pricing, and a worked landed-cost example, the calcium carbonate (gcc / pcc / limestone) cornerstone hub covers the full sourcing chain.

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

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Read next

Cross-jurisdiction profile and sourcing references

Referenced in

5 pages across the Sourzi moat

This term shows up in 4 regulatory pages, 1 CAS profiles. Sample backlinks per content type below.

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