Magnesium Stearate
Synonyms
Stearic acid, magnesium salt;
Octadecanoic acid, magnesium salt;
Magnesium octadecanoate;
Category
Anionic Surfactant
> Carboxylate
>> Chain Carboxylate
>>> Alkyl Carboxylate
>>>> Linear Alkyl Carboxylate
Chemical Numbering System
CAS: 557-04-0
EINECS: 209-150-3
Molecular Formula & Molecular Weight
Molecular Formula: C36H70MgO4; C36H72O4.Mg
Molecular Weight: 591.24
Structure
Properties
Appearance (1), white powder.
Solubility insoluble in water. slightly soluble in ethanol. soluble in hot ethanol.
Stability stable.
Risk Solid form: flammable material; irritation, irritation to skin, eye, respiratory system. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent lubricating, emulsifying, dispersing, antistatic abilities.
Synthesis
Sodium stearate reacts with magnesium sulfate solution, then obtain.
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
98.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
GB/T 5173 Surface active agents and detergents -- Determination of anionic-active matter by direct two-phase titration procedure
ISO 2271 Surface active agents -- Detergents -- Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Product standards
(1), Chinese standards
(1a), GB 1886.91 Food safety national standard -- Food additive -- Magnesium stearate
(1b), Chinese Pharmacopoeia (2015 Edition) Magnesium stearate
4, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
(b), Used in cosmetics, should be test for harmful substances; or furtherly test for microorganisms.
Major Uses
1, Typical applications
Use as lubricant.
Use as emulsifying agent, dispersing agent.
Use as antistatic agent.
2, Household detergents
Use as lubricant, release agent.
3, Personal care products
Anticaking agent, bulking agent, colorant, humectant in personal care products.
4, Machinery industry
Lubricant, release agent, glidant in metal processing.
5, Rubber industry
Use as lubricant, release agent.
6, Plastics
Use as heat stabilizer, lubricant.
7, Pets
Use as anticaking agent, bulking agent, colorant.
8, Powder forming
Lubricant, release agent, glidant in powder forming.
9, Food
Use as emulsifying agent, anticaking agent.
10, Medicine
Pharmaceutical excipients. Use as lubricant. (This section is for reference only, should be implemented according to local Pharmacopoeia.)
Manufacturers
Update: 20131102(1); 20171215(2);