Request Quote
Acids & Salts Available — Bulk Only

Magnesium Stearate

CAS 557-04-0 · Formula C36H70MgO4 · MW 591.2 g/mol

A workhorse metallic-soap lubricant and flow aid for tablet, powder, plastic, and cosmetic formulations. It is widely used as a lubricant, anticaking, and release agent in tableting and powder processing, as a lubricant and stabilizer in plastics, and as an emulsifying and refatting agent in cosmetics.

Part of Sensory Modifiers
Request SDS
HS Code
2915.70
At a Glance
Material Family
Acids & Salts
Record Type
Pure compound
Primary Role
Thickening / Rheology · Moisture Control
Solubility
IN 100 CC WATER: 0.003 G @ 15 °C; 0.004 G @ 25 °C; 0.008 G @ 50 °C
Functional Roles
Thickening / Rheology Moisture Control Color / Pigmentation Lubrication Slip / Release
INCI Name
MAGNESIUM STEARATE
CosIng Functions
ANTICAKINGBULKINGCOLORANTMOISTURISING
Industries Served
Beauty & Personal Care Industrial Manufacturing Oil & Gas Plastics & Polymers
Applications & Use Cases
  • ▸ Tableting and powders: Lubricant, anticaking, and release agent
  • ▸ Plastics: Lubricant and stabilizer in polyolefin compounds
  • ▸ Cosmetics: Emulsifying and refatting agent
  • ▸ Rubber: Dusting and release agent
Physical Properties
Melting Point
88.5 °C (pure)
Density
1.028
Solubility
IN 100 CC WATER: 0.003 G @ 15 °C; 0.004 G @ 25 °C; 0.008 G @ 50 °C
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

Request SDS →
HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2915 . 70
Chapter 29
Organic chemicals
Heading 29.15
Internationally harmonized (WCO HS)
Subheading 2915.70
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
557-04-0
Molecular Formula
C36H70MgO4
Molecular Weight
591.2 g/mol
IUPAC Name
magnesium bis(octadecanoate)
INCI Name
MAGNESIUM STEARATE
PubChem CID
11177
InChI Key
HQKMJHAJHXVSDF-UHFFFAOYSA-L
Synonyms & Trade Names
MAGNESIUM STEARATE Magnesium distearate Magnesium octadecanoate Dibasic magnesium stearate Octadecanoic acid, magnesium salt Synpro 90 Petrac MG 20NF Stearic acid, magnesium salt Magnesium stearate g Synpro Magnesium Stearate 90 Magnesii stearas NP 1500 SM 1000 Octadecanoic acid, magnesium salt (2:1) DAYCLING
Full Description

Magnesium stearate (CAS 557-04-0) is the magnesium salt of stearic acid, supplied to NF and food-grade specification. It is widely used as a lubricant, anticaking, and release agent in tableting and powder processing, as a lubricant and stabilizer in plastics, and as an emulsifying and refatting agent in cosmetics.

Frequently Asked Questions

What is magnesium stearate best used for?

Magnesium stearate (CAS 557-04-0) is widely used as a lubricant, anticaking, and release agent in tableting and powder processing. It also serves as a lubricant and stabilizer in plastics and as an emulsifying and refatting agent in cosmetics.

What is magnesium stearate (NF)?

NF designates that the material conforms to National Formulary specifications. This grade is magnesium stearate (CAS 557-04-0), the magnesium salt of stearic acid, supplied to NF and food-grade (FG) specification.

What is magnesium stearate made from?

It is the magnesium salt of stearic acid, a saturated fatty acid, with formula C36H70MgO4 (CAS 557-04-0). It is supplied as a fine powder.

What is the role of magnesium stearate in tablet formulation?

In tableting it acts as a lubricant and release agent, reducing friction between the powder blend and tooling and preventing sticking during compression. It also functions as an anticaking, free-flow aid in powder processing.

What is the HS code and how is bulk magnesium stearate NF/FG supplied?

It classifies under HS 2915.70 (stearic acid, its salts and esters). It is supplied to NF and food-grade specification in bulk for tableting, plastics, cosmetic, and rubber applications; request a bulk quote with CoA and SDS for your target quantity.

Related Products
Sodium Sesquicarbonate (Trona)
CAS 533-96-0 · C2HNa3O6
Acids & Salts
Sodium Sulfite
CAS 7757-83-7 · Na2O3S
Acids & Salts
Magnesium Malate
CAS 869-06-7 · C4H4MgO5
Acids & Salts
Ascorbic Acid (Vitamin C)
CAS 50-81-7 · C6H8O6
Acids & Salts
Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.
Bulk & Specialty Sourcing

Ready to Source Magnesium Stearate?

Our procurement team handles specification confirmation, lead time, and logistics.

Request a Quote Browse the Catalog