Aluminum Monostearate
Synonyms
Aluminum stearate;
Dihydroxy(stearato)aluminu;
Dihydroxyaluminium stearate;
Octadecanoic acid, aluminum salt (1:1);
Category
Anionic Surfactant
> Carboxylate
>> Chain Carboxylate
>>> Alkyl Carboxylate
>>>> Linear Alkyl Carboxylate
Chemical Numbering System
CAS: 7047-84-9
EINECS: 230-325-5
Molecular Formula & Molecular Weight
Molecular Formula: C18H37AlO4
Molecular Weight: 344.47
Structure
Properties
Appearance (1), white powder.
Solubility insoluble in water. soluble in petroleum ether, turpentine. soluble in alkali solution.
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, antirust, emulsifying, dispersing, thickening, defoaming abilities. Reaction with alcohol, can form gel.
Synthesis
Sodium stearate reacts with aluminium sulfate solution, then obtain.
According to the amount of aluminum salt, aluminum monostearate, aluminum distearate, aluminum tristearate can be obtained.
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
95.0 |
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, 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 emulsifying agent, dispersing agent.
Use as thickening agent.
Use as lubricant.
Use as defoaming agent.
2, Personal care products
Anticaking agent, emulsion stabilizer, viscosity controlling agent, colorant in personal care products.
3, Machinery industry
Rust inhibitor in metal processing.
Can thicken mineral oil.
Antirust ability lower than aluminum distearate and aluminum tristearate.
4, Plastics
Use as heat stabilizer, lubricant. For example: polyethylene processing.
5, Pets
Use as anticaking agent, emulsion stabilizer.
6, Coatings
Suspending agent, matting agents in paint.
7, Textile
Waterproof agent in textile.
8, Cement
Use as cement additive (waterproof additive).
Manufacturers
Update: 20131102(1); 20171215(2);