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557-04-0

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Identification

Name
Magnesium stearate
CAS
557-04-0
Synonyms
MAGENSIUM STEARATE
MAGNESIUM OCTADECANOATE
MAGNESIUM STEARATE
OCTADECANOIC ACID MAGNESIUM SALT
OCTADECONIC ACID MAGNESIUM SALT
STEARIC ACID MAGNESIUM SALT
dibasicmagnesiumstearate
Dolomol
magnesiumdistearate
Magnesiumstearatemedicinal
petracmg20nf
stearatedemagnesium
Magnesium Stearate Bp
MAGNESIUM STEARATE, TECH.
MAGNESIUM STEARATE EXTRA PURE DAB, PH. E UR., B.P., PH. FRANC.
MAGNESIUM STEARATE EXTRA PURE PHARMACOPOEIA
MAGNESIUM STEARATE 98%
Magnesium Stearate USP, Kosher
Magnesium Stearate Veg. NF
MagnesiumStearatePrecipitated
EINECS(EC#)
209-150-3
Molecular Formula
C36H70MgO4
MDL Number
MFCD00036391
Molecular Weight
591.24
MOL File
557-04-0.mol

Chemical Properties

Definition
Mg(C18H35O2)2 or with one H2O. Technical grade contains small amounts of the oleate and 7% magnesium oxide, MgO.
Appearance
white powder
mp 
200 °C(lit.)

density 
1.028g/cm3
storage temp. 
Store at RT.
Stability:
Stable. Incompatible with strong oxidizing agents.
Water Solubility 
Insoluble
Merck 
14,5690
Uses
Magnesium Stearate is the magnesium salt of stearic acid which functions as a lubricant, binder, emulsifier, and anticaking agent. it is a white powder that is insoluble in water. it is used as a lubricant or die release in tableting pressed candies and is also used in sugar- less gum and mints.
CAS DataBase Reference
557-04-0(CAS DataBase Reference)
EPA Substance Registry System
557-04-0(EPA Substance)

Safety Data

Hazard Codes 
Xi
Risk Statements 
R36/37/38:Irritating to eyes, respiratory system and skin .
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S37/39:Wear suitable gloves and eye/face protection .
WGK Germany 
-

RTECS 
WI4390000

HS Code 
29157030
Safety Profile
Slightly toxic by ingestion. Spontaneously combustible. When heated to decomposition it emits acrid smoke and toxic fumes.
Hazardous Substances Data
557-04-0(Hazardous Substances Data)

Raw materials And Preparation Products

Material Safety Data Sheet(MSDS)

Questions And Answer

Surfactant
Magnesium stearate is a kind of fatty acid salt type anionic surfactant with its appearance being white powder with slight special smell and creamy feeling. It can be soluble in hot aliphatic hydrocarbons, hot arene and hot grease but insoluble in alcohol and water with being decomposed into stearic acid and corresponding magnesium salts in case of acid. Magnesium stearate has an excellent adhesion property to the skin with excellent lubrication property. It can be applied to powder products in cosmetics and can improve adhesion and lubrication.
Magnesium stearate
Magnesium stearate can be used as PVC heating stabilizers with the stability performance being similar to calcium stearate and can be combined with zinc or calcium soaps for being applied to food packaging material but without very wide application.
Magnesium stearate can be used as a mold releasing agent of plastic products, face powder of cosmetics, the raw material of skin ointment, the powder molding tablet of pharmaceutical tablets and translucent flatting agent of paint.
Laboratory, through the replacement reaction of sodium stearate and magnesium sulfate, is able to get finished product of magnesium stearate and can also apply the combination reaction between edible solid organic acids (stearic acid, palmitic acid) mixture and magnesium oxide compounds and further refinement to make it.
Chemical Properties
Magnesium stearate is a fatty acid, salt-type anionic surfactant with its appearance being white powder with a creamy feeling. It is a compound of magnesium with a mixture of solid organic acids obtained from edible sources and consists chiefly of variable proportions of magnesium stearate and magnesium palmitate.
It appears as bright white soft powder with the industrial products containing a small amount of oleic acid and 7% magnesium oxide and is odorless and tasteless. It is slightly soluble in water and soluble in hot ethanol.
Uses
Magnesium stearate has been widely used for many decades in the food industry as an emulsifier, binder and thickener, as well as an anticaking, lubricant, release, and antifoaming agent. It is present in many food supplements, confectionery, chewing gum, herbs and spices, and baking ingredients. Magnesium stearate is also commonly used as an inactive ingredient in the production of pharmaceutical tablets, capsules and powders. The main reason for its good lubricating properties is its hydrophobic nature and an ability to reduce friction between tablets and die wall during the ejection process.
Magnesium stearate can be regarded as being non-toxic, the United States, Germany and Japan allow it to be applied to products being contact with food. However, it doesn’t have wide application to be applied as PVC heat stabilizers. In China and some other countries Pharmacopoeia, there are always records of this specie. The pharmacopeia has also made provisions on the magnesium content, moisture, heavy metals, iron, sulfate and chloride content.
Pharmaceutical Applications
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. It has been used as a tablet and capsule lubricant. It has also been used for preparing microcapsules. Dry coating of drugs with magnesium stearate leads to flow improvement, flow-aid and lubrication effects, tabletability as well as non-inhibited dissolution rate.
Production method
Magnesium stearate is produced by the reaction of sodium stearate with magnesium salts or by treating magnesium oxide with stearic acid (Nora 2005).
Magnesium stearate can be produced through the following procedure: first get the sodium stearate through the saponification between stearic acid and sodium; then the sodium stearate has double decomposition reaction with magnesium sulfate to get the finished product. Stearic acid and water was added to the reaction pot and heated to 85 ℃, stirring to dissolve, slowly add them to the sodium hydroxide solution preheated to 75 ℃. After the saponification reaction was completed, the temperature was controlled at 72 ℃ and slowly added to the magnesium sulfate solution preheated to 55 ℃ upon stirring. After metathesis, apply centrifuge to remove the water. The filtering cake was washed with water until sulfate ion requirement is met, then dry, apply air drying, sifting to obtain the finished products with the yield of stearic acid being 100%.
It is produced through the combination reaction between magnesium oxide and food grade solid mixed fatty acids (mainly stearic acid) and further refinement.
Toxicity
Magnesium stearate is considered to be non-toxic, and is Generally Recognized As Safe (GRAS) by the U.S. Food and Drug Administration (FDA). It is approved for use in food and dietary supplements as a lubricant and release agent, emulsifier, binder, thickener, anticaking and anti-foaming agent. In addition to the United States, it is accepted as a safe food additive in Europe, the UK, and Canada. A specification for magnesium stearate is also included in the Food Chemicals Codex (FCC), a collection of internationally recognized standards for the purity and identity of food ingredients. According to the FDA, there is no evidence to suggest that magnesium stearate causes adverse effects when used “at levels that are now current and in the manner now practiced, or which might reasonably be expected in the future.” Animal research shows that orally-administered magnesium stearate is non-toxic far beyond the commonly used amounts. Additionally, as recently as 2015, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) conducted a safety assessment of magnesium stearate and found no concerns regarding its continued use or safety.

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