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Magnesium stearate

CAS 557-04-0

U.S. production volumes are classified as confidential business information.

Molecular structure of 557-04-0
1 Mg²⁺
US productionCBI
Import value, 2024$6.2B
Top sourceJapan 32%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 291570, 382499 · basket

EPA reports by year
2023
US production Confidential · Imports Confidential
2019
US production Confidential · Imports Confidential

These shares come from HS customs code 291570, 382499, which covers 288 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
JP 32%JapanKR 27%South KoreaDE 8%GermanyCA 6%CanadaCN 4%China
EPA-registered manufacturers (8)
Mallinckrodt Plc · IE Ireland
Peter Greven Gmbh & Co Kg · DE Germany
Baerlocher Production
Martin Marietta Materials
Meh
Show all 8
Norac Additives
Pmc Biogenix
Polymer Additves
Domestic parents -- activity not disclosed (5)
Acme-Hardesty Co A Division Of Jacob Stern & Sons
American International Chemical
Bridgestone Sporting Goods Mfg Usa
Marubeni America
Silver Fern Chemical
EPA-registered importers (9)
Clariant International · CH Switzerland
Ioi Acidchem Sdn Bhd · MY Malaysia
Ravago S A · LU Luxembourg
Acidchem (Usa)
Basstech International
Show all 9
Blue Tree Holdings
Clariant
Faci Usa
Goulston Technologies

Why It Matters

Sectors
HealthFoodPlastics & RubberTextilesPaints & CoatingsCore Chemicals
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Industrial Uses

Used in 8 sectors as 3 functional roles.

  • •Flame retardant in Plastics Product Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
  • •Lubricating agent in All Other Chemical Product and Preparation Manufacturing (10%)Processing—incorporation into article
  • •Lubricating agent in Custom Compounding of Purchased Resins (75%)Processing—incorporation into article
  • •Lubricating agent in Pharmaceutical and Medicine Manufacturing (2%)Processing—incorporation into article
  • •Lubricating agent in Textiles, apparel, and leather manufacturing (11%)Processing—incorporation into article
  • •Lubricating agent in Plastics Material and Resin Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
  • •Sealant (barrier) in Paint and Coating Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
  • •Lubricating agent in Plastics Product ManufacturingProcessing—incorporation into article
  • •Lubricating agent in Synthetic Rubber ManufacturingProcessing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS557-04-0
PubChem CID11177
DTXSIDDTXSID2027208
FormulaC36H70MgO4
Mol. Weight591.2 g/mol
SMILESCCCCCCCCCCCCCCCCCC(=O)[O-].CCCCCCCCCCCCCCCCCC(=O)[O-].[Mg+2]

Data Sources

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Brief citations

Magnesium stearate (CAS 557-04-0) https://chemicalindependence.com/chemical/557-04-0/ EPA CompTox (DSSTox): DTXSID2027208. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID2027208 PubChem: 11177. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/11177 EPA Chemical Data Reporting: 557-04-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 557-04-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291570,382499 for CAS 557-04-0. Reporting year: 2024. https://usatrade.census.gov/