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zinc stearate

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zinc stearate is a widely used ingredient in cosmetics, personal care, and skincare formulations. Depending on its function, it may serve as a moisturizer, preservative, emulsifier, or active ingredient to enhance the overall effectiveness and performance of a product.

zinc stearate (Wikipedia)

Zinc stearate is a "zinc soap" that is widely used industrially. In this context, soap is used in its formal sense, a metal salt of a fatty acid: in this case stearic acid. It is a white solid 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.

Zinc stearate
Zinc stearate
Zinc stearate
Names
IUPAC name
zinc octadecanoate
Other names
zinc distearate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.008.321 Edit this at Wikidata
EC Number
  • 209-151-9
RTECS number
  • ZH5200000
UNII
UN number 3077
  • InChI=1S/2C18H36O2.Zn/c2*1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h2*2-17H2,1H3,(H,19,20);/q;;+2/p-2 checkY
    Key: XOOUIPVCVHRTMJ-UHFFFAOYSA-L checkY
  • InChI=1/2C18H36O2.Zn/c2*1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h2*2-17H2,1H3,(H,19,20);/q;;+2/p-2
    Key: XOOUIPVCVHRTMJ-NUQVWONBAX
  • [Zn+2].[O-]C(=O)CCCCCCCCCCCCCCCCC.[O-]C(=O)CCCCCCCCCCCCCCCCC
Properties
C36H70O4Zn
Molar mass 632.33 g·mol−1
Appearance soft, white powder
Odor slight, characteristic
Density 1.095 g/cm3, solid
Melting point 120 to 130 °C (248 to 266 °F; 393 to 403 K)
Boiling point decomposes
insoluble
Solubility in Ethanol insoluble
Solubility in ether insoluble
Solubility in benzene slightly soluble
Hazards
GHS labelling:
GHS07: Exclamation markGHS09: Environmental hazard
Warning
H335, H400, H413
P261, P271, P273, P304+P340, P312, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuelInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
2
0
Flash point 277 °C (531 °F; 550 K)
420 °C (788 °F; 693 K)
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
REL (Recommended)
 TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
IDLH (Immediate danger)
 N.D.
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Zinc carboxylates, e.g. basic zinc acetate, adopt complex formulas, and are not simply dicarboxylates of zinc. Instead the formula for most zinc carboxylates is Zn4O(O2CR)6, consisting of a Zn4O6+ core with carboxylate ligands spanning the edges.

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