Zinc Stearate
Synonyms
Stearic acid, zinc salt;
Octadecanoic acid, zinc salt;
Zinc octadecanoate;
Zinc dioctadecanoate;
Category
Anionic Surfactant
> Carboxylate
>> Chain Carboxylate
>>> Alkyl Carboxylate
>>>> Linear Alkyl Carboxylate
Chemical Numbering System
CAS: 557-05-1
EINECS: 209-151-9
Molecular Formula & Molecular Weight
Molecular Formula: C36H70ZnO4; C36H72O4.Zn
Molecular Weight: 632.35
Structure
Properties
Appearance (1), white powder.
Solubility insoluble in water. soluble in benzene.
Physical - chemical properties
|
Melting point, °C |
130[1] |
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: 
Animal Toxicity
Table 1 Animal toxicity values
|
rat oral LD50 |
> 10000mg/kg[2] |
|
rat intratracheal LDLo |
250mg/kg[2] |
|
mouse oral LD50 |
> 10000mg/kg[2] |
|
mouse intraperitoneal LD50 |
354mg/kg[2] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent lubricating, emulsifying, dispersing abilities.
Note (1), Do not used in children products, such as: talcum powder.
Synthesis
Sodium stearate reacts with zinc sulfate solution, then obtain.
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
95.0 |
|
Zn, % |
|
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), Zn
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid |
|
|
Heavy metals (as Pb, except Zn), 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), Chinese Pharmacopoeia (2015 Edition) Zinc stearate
(1b), HG/T 3667 Zinc 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.
2, Household detergents
Use as lubricant, release agent.
3, Personal care products
Anticaking agent, colorant, humectant in personal care products.
4, Machinery industry
Lubricant, release agent, glidant in metal processing.
5, Rubber industry
Vulcanization active agent, softener in rubber.
6, Plastics
Lubricant, releasing agent used in manufacture of styrene resin, phenol resin, amino resins.
7, Pets
Use as anticaking agent, colorant.
8, Powder forming
Lubricant, release agent, glidant in powder forming.
9, Coatings
Used in waterborne coatings. Can increase the smoothness.
10, Medicine
Pharmaceutical excipients. Use as lubricant, such as lubricant for tablets and capsules. (This section is for reference only, should be implemented according to local Pharmacopoeia.)
Manufacturers
References
[1]: HSDB. 557-05-1, Zinc stearate
[2]: ChemIDplus. 557-05-1, Zinc stearate
Update: 20131102(1); 20171215(2);