What is Magnesium Stearate CAS 557-04-0?

Magnesium stearate is the magnesium salt of stearic acid, with CAS 557-04-0, EINECS 209-150-3 and molecular formula C₃₆H₇₀MgO₄. It is a white, fine, free-flowing powder with a slippery feel.

What is Magnesium Stearate used for?

It is widely used as a lubricant, anti-adherent and flow aid in tablet and capsule manufacturing. It also acts as an anti-caking or mold-release agent in powders, cosmetics, food supplements, plastics and coatings.

Is Magnesium Stearate soluble in water?

No. Magnesium stearate is practically insoluble in water, ethanol and ether. This hydrophobic character is useful in lubrication and moisture-sensitive powder formulations, but it should be considered when designing aqueous systems.

What is the difference between industrial-grade and pharmaceutical-grade Magnesium Stearate?

Pharmaceutical and food grades are controlled to compendial standards such as USP/NF, Ph. Eur. or FCC, with tighter limits for magnesium content, free fatty acids, heavy metals and particle properties. Industrial grade is suitable for non-pharmaceutical uses such as plastics, coatings and general powder processing.

Magnesium Stearate CAS 557-04-0

Magnesium Stearate, CAS 557-04-0, is the magnesium salt of stearic acid, a white hydrophobic powder used as a lubricant, anti-adherent and flow aid in tablet and capsule manufacturing, and as a mold-release and anti-caking agent in cosmetics, food supplements, plastics and coatings. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 557-04-0
Synonyms: Magnesium distearate, Octadecanoic acid magnesium salt, Magnesium di-stearate, Stearic acid magnesium salt
Einecs: 209-150-3
Molecular Formula: C₃₆H₇₀MgO₄
Grade: Industrial grade 99%
Package: 200kg iron drum or 50kg plastic drum packing

Request a quote

Share:

Product Description

Magnesium Stearate, CAS 557-04-0, is the magnesium salt of stearic acid; the EC/EINECS number is 209-150-3.

Synonyms: Magnesium distearate; Octadecanoic acid magnesium salt; Stearic acid magnesium salt.

CAS: 557-04-0.

Molecular formula: C₃₆H₇₀MgO₄.

Molecular weight: 591.25.

EC number: 209-150-3.

It is a white, fine, free-flowing powder with a slight fatty odor and a greasy feel.

It is practically insoluble in water, ethanol and ether.

It softens at about 88.5 °C.

It is used as a lubricant, anti-adherent and flow aid in tablet and capsule manufacturing.

It is used as an anti-caking and mold-release agent in powders, cosmetics, food supplements, plastics and coatings.

It is used as a PVC heat stabilizer and as a flatting agent in coatings.

Confirm the magnesium content, free fatty acids or acid value, heavy metals, loss on drying and particle size; select a compendial grade for pharmaceutical or food use.

Store in tightly closed containers in a cool, dry, ventilated area away from moisture and strong oxidizers; use dust control and suitable PPE.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA, or other product-specific files.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Magnesium Stearate CAS 557-04-0?

A: Magnesium stearate is the magnesium salt of stearic acid, with CAS 557-04-0, EINECS 209-150-3 and molecular formula C₃₆H₇₀MgO₄. It is a white, fine, free-flowing powder with a slippery feel.
Q:
What is Magnesium Stearate used for?

A: It is widely used as a lubricant, anti-adherent and flow aid in tablet and capsule manufacturing. It also acts as an anti-caking or mold-release agent in powders, cosmetics, food supplements, plastics and coatings.
Q:
Is Magnesium Stearate soluble in water?

A: No. Magnesium stearate is practically insoluble in water, ethanol and ether. This hydrophobic character is useful in lubrication and moisture-sensitive powder formulations, but it should be considered when designing aqueous systems.
Q:
What is the difference between industrial-grade and pharmaceutical-grade Magnesium Stearate?

A: Pharmaceutical and food grades are controlled to compendial standards such as USP/NF, Ph. Eur. or FCC, with tighter limits for magnesium content, free fatty acids, heavy metals and particle properties. Industrial grade is suitable for non-pharmaceutical uses such as plastics, coatings and general powder processing.
Q:
How should Magnesium Stearate be stored and handled?

A: Keep it in tightly closed containers in a cool, dry, ventilated area away from moisture and strong oxidizers. Use dust-control measures and suitable PPE when transferring or blending the fine powder.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

Current Language

Change Language