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Magnesium stearate

puriss., meets analytical specification of Ph. Eur., BP, ≥90% stearic and palmitic acid basis, ≥40% stearic acid basis (GC), 4.0-5.0% Mg basis (calc on dry sub.)

Stearic acid magnesium salt
Linear Formula:
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:




≥40% stearic acid basis (GC)
≥90% stearic and palmitic acid basis
4.0-5.0% Mg basis (calc on dry sub.)


meets analytical specification of Ph. Eur., BP


acidity or alkalinity, complies
microbiological impurity, in accordance
residual solvents, complies


≤6.0% loss on drying, 105 °C


200 °C (lit.)

acid value

195‑210(fatty acid)


alcohol: insoluble
diethyl ether: insoluble
water: insoluble

anion traces

chloride (Cl-): ≤1000 mg/kg
sulfate (SO42-): ≤5000 mg/kg

cation traces

Cd: ≤3 mg/kg
Ni: ≤5 mg/kg
Pb: ≤10 mg/kg


in accordance for fatty acid composition
passes test for identity

Featured Industry

Pharmaceutical (small molecule)

SMILES string




InChI key


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Magnesium stearate has been used as a tablet and capsule lubricant. It has also been used for preparing microcapsules.

Biochem/physiol Actions

Magnesium stearate is the magnesium salt of stearic acid that possess lubricating properties and hence prevents ingredients from sticking to manufacturing equipment during the compression of chemical powders into solid tablets. Dry coating of drugs with magnesium stearate leads to flow improvement, flow-aid and lubrication effects, tabletability as well as non-inhibited dissolution rate.

Storage Class Code

13 - Non Combustible Solids

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

M J Amorim et al.
European journal of pharmaceutics and biopharmaceutics : official journal of Arbeitsgemeinschaft fur Pharmazeutische Verfahrenstechnik e.V, 52(1), 39-44 (2001-07-05)
Several different peptides and proteins, such as the pancreatic trypsin inhibitor, growth factors and trefoil peptides, are known to play important roles in maintaining the structure and function of the gastrointestinal wall. With the advent of recombinant biotechnology, it has...
<BIG>Marleen de Veij</BIG>
Journal of Raman Spectroscopy, 40 (2008)
Ziyaur Rahman et al.
International journal of pharmaceutics, 475(1-2), 462-470 (2014-09-01)
Clinical performance of an amorphous solid dispersion (ASD) drug product is related to the amorphous drug content because of the greater bioavailability of this form of the drug than its crystalline form. Therefore, it is paramount to monitor the amorphous...
A Kluk et al.
International journal of pharmaceutics, 485(1-2), 1-6 (2015-03-05)
Minitablets are a novel, multi-compartment solid drug formulation, particularly intended for children between 1 and 6 years of age. Available literature shows that even infants are capable of swallowing a single minitablet. In this study, we have explored the level...
Julia Grund et al.
International journal of pharmaceutics, 469(1), 94-101 (2014-04-22)
The objective of this study was to identify and evaluate key polymer properties affecting direct compression and drug release from water-insoluble matrices. Commonly used polymers, such as Kollidon(®) SR, Eudragit(®) RS and ethyl cellulose, were characterized, formulated into tablets and...

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