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Magnesium stearate

Magnesium stearate is the chemical compound with the formula Mg(C18H35O2)2. It is a soap, consisting of salt containing two equivalents of stearate (the anion of stearic acid) and one magnesium cation (Mg2+). Magnesium stearate is a white, water-insoluble powder. Its applications exploit its softness, insolubility in many solvents, and low toxicity. It is used as a release agent and as a component or lubricant in the production of pharmaceuticals and cosmetics.

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Further Information

Names

IUPAC nameMagnesium octadecanoate

Identifiers

CAS Number: 557-04-0

JSmol: Interactive image

ChEBI: CHEBI:9254

ChemSpider: 10704

ECHA InfoCard: 100.008.320

E number: (acidity regulators, …)

PubChem: 11177

UNII: 70097M6I30

Properties

Chemical formula:

Molar mass: 591.27 g/mol

Appearance: light white powder

Odor: slight

Density: 1.026 g/cm

Melting point: 88.5 °C (191.3 °F; 361.6 K)

Solubility in water: 0.003 g/100 mL (15 °C)
0.004 g/100 mL (25 °C)
0.008 g/100 mL (50 °C)

Solubility: ether

Hazards

Safety data sheet: External MSDS

NFPA 704:

Flash point: 250 °C (482 °F; 523 K)

median dose: > 1000 mg/kg (oral, rat)

Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).

Infobox references