Aluminum tristearate
CAS 637-12-7
EC 211-279-5
Formula C18H36O2.1/3Al
MW 877.39 g/mol
Surfactants Lubricants & MetalworkingCoatings, Adhesives, Sealants & ElastomersPlastics & PolymersPersonal Care & Cosmetics LubricationEmulsification & DispersionRheology ModificationAntioxidant & Stabilizer
Description
Aluminum tristearate (CAS 637-12-7) is a metallic soap formed from aluminum and stearic acid, commercially available under trade names including Rofob 3, Metasap XX, and Alugel 34TN. It is also referred to as aluminum stearate and carries no assigned E-code, placing it outside food additive classifications in the EU.
In lubricant and grease formulations, aluminum tristearate functions as a thickener and anti-wear agent by forming a structured gel network within base oils, improving load-bearing performance. In coatings and sealants, it acts as a rheology modifier and emulsion stabilizer, preventing pigment settling and controlling viscosity through its interaction with the continuous phase.
The material is supplied as a fine powder and is subject to REACH registration requirements within the EU. Grades vary in free fatty acid content and particle size to suit specific processing conditions. Buyers should confirm technical data sheets for purity specifications relevant to their application.
In lubricant and grease formulations, aluminum tristearate functions as a thickener and anti-wear agent by forming a structured gel network within base oils, improving load-bearing performance. In coatings and sealants, it acts as a rheology modifier and emulsion stabilizer, preventing pigment settling and controlling viscosity through its interaction with the continuous phase.
The material is supplied as a fine powder and is subject to REACH registration requirements within the EU. Grades vary in free fatty acid content and particle size to suit specific processing conditions. Buyers should confirm technical data sheets for purity specifications relevant to their application.
Physical Properties
| Melting Point | 118 °C |
| Boiling Point | 250°C[at 101 325 Pa] |
| Density | 1.070 g/cm³ |
| Appearance | solid |
| Color | white |
| Form | powder |
| Water Solubility | Soluble in alkali, glycol, chlorinated hydrocarbons, petroleum, benzene, turpentine oil, mineral oil, vegetable oil, mixture of benzene, toluene and the three xylene isomers. Insoluble in water, ethanol and ether. |
| Vapor Pressure | 0Pa at 25℃ |
| Log P | 22.69 |
Trade & Regulatory
| WGK (Germany) | 3 |
Other Names
Aluminum Tris(octadecanoate)Rofob 3Metasap XXAlugel 34TNAluminum stearateAluminium stearatealuminium tristearate
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Raw Materials
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