Zinc stearate

Zinc stearate

IUPAC name zinc octadecanoate
Other names zinc distearate
Identifiers
CAS number	557-05-1^Y
PubChem	11178
ChemSpider	10705^Y
UNII	H92E6QA4FV^Y
Jmol-3D images	Image 1
SMILES [Zn+2].[O-]C(=O)CCCCCCCCCCCCCCCCC.[O-]C(=O)CCCCCCCCCCCCCCCCC
InChI InChI=1S/2C18H36O2.Zn/c21-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h22-17H2,1H3,(H,19,20);/q;;+2/p-2^Y Key: XOOUIPVCVHRTMJ-UHFFFAOYSA-L^Y InChI=1/2C18H36O2.Zn/c21-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h22-17H2,1H3,(H,19,20);/q;;+2/p-2 Key: XOOUIPVCVHRTMJ-NUQVWONBAX
Properties
Molecular formula	C₃₆H₇₀O₄Zn
Molar mass	632.35 g mol⁻¹
Appearance	soft, white powder
Density	1.095 g/cm³, solid
Melting point	120–130 °C
Boiling point	decomposes
Solubility in water	insoluble
Solubility in benzene	slightly soluble
Hazards
EU classification	not listed
NFPA 704	2 1 0
Flash point	277 °C
Autoignition temperature	420 °C
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Zinc stearate (Zn(C₁₈ H₃₅ O₂)₂) is a zinc soap that repels water. It is insoluble in polar solvents such as alcohol and ether but soluble in aromatic hydrocarbons (e.g., benzene and chlorinated hydrocarbons) when heated. It is the most powerful mold release agent among all metal soaps. It contains no electrolyte and has a hydrophobic effect. Its main application areas are the plastics and rubber industry where it is used as a releasing agent and lubricant which can be easily incorporated.

Applications

As a synergic stabilizer for Ba/Cd and Pb stabilizer systems.
As a gloss imparting agent in paint industry.
As a metal release agent in rubber, polyurethane and polyester processing system.
As a die release agent in powder metallurgy.
As a chief ingredient in "fanning powder", used by magicians performing card manipulation to decrease the friction between the cards.
As a lubricant in cosmetics to improve texture.^[1]
As an activator system for rubber vulcanization by sulfur and accelerators

References

^ http://www.cfsan.fda.gov/~dms/cos-chem.html