• Magnesium stearate CAS 557-04-0
  • Magnesium stearate CAS 557-04-0

Magnesium stearate CAS 557-04-0

Magnesium Stearate (CAS 557-04-0), chemically defined as the magnesium salt of octadecanoic acid, is a white, hydrophobic powder functioning as a primary lubricant and anti-caking agent. Often utilized in solid dosage manufacturing and industrial processing, this compound reduces friction between particles and equipment surfaces, serving as a critical excipient in pharmaceutical tableting and a release agent in polymer molding operations. We provide this industrial material with competitive factory pricing to support continuous manufacturing operations, alongside options for customized specifications. Essential technical documentation, including MSDS, TDS, COA, is readily available for all bulk supply orders.

  • 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
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Product Description

Magnesium stearate is a white sandless fine powder; slightly smelly; There is a slippery sensation in contact with the skin. This product is insoluble in water, ethanol or ether, and is mainly used as a lubricant, anti-stick agent, and flow aid. It is especially suitable for the granulation of oils and extracts, and the granules made have good fluidity and compressibility. Used as a flow aid in direct tableting. It can also be used as a filter aid, clarifying agent and foaming agent, as well as a suspension aid and thickener for liquid preparations.

Magnesium stearate physical properties:

Chemical formula: C₃₆H₇₀MgO₄

Molecular weight: 591.24

CAS accession number: 557-04-0

Melting point: 88.5ºC

Boiling point: 359.4°C

Water solubility: insoluble in water

Density: 1.028g/cm³

Appearance: white powder

Flash point: 162.4°C

Application: Used as a flow aid in direct tableting. It can also be used as a filter aid, clarifier and foaming agent

Apply:

1. This product is used as a polyvinyl chloride heat stabilizer, as well as cosmetic flour, emollient ointment and pharmaceutical tablet raw materials (excipients, lubricants); It is used in school wood powder to make it lubricated, bright and transparent; paint industry as a transparent flattening agent, etc.

2. Used in food, medicine, coatings, plastics, rubber, textiles, etc.

3. It is a new type of pharmaceutical excipient, which can be used as a film-forming coating material for solid preparations, a thickener and suspension agent for colloidal liquid preparations, etc.

4. It is used in cosmetics for powder products, which can improve adhesion and lubricity, and can also be used as a raw material for pharmaceutical tablets.

FAQ - Technical & Supply Chain

  • Q:

    Does CAS 557-04-0 refer specifically to the magnesium salt of stearic acid?

    A: Yes, CAS 557-04-0 is the standard registry number for Magnesium Stearate, identifying the specific salt formed by magnesium and stearic acid used in formulation.
  • Q:

    Is this powder suitable for use as a lubricating agent in dry blending processes?

    A: Yes, it is typically applied in dry blending and compaction stages to ensure flowability and prevent adhesion during tablet compression or capsule filling.
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