Cadmium stearate

Cadmium stearate is a salt with the formula Cd(O₂CC₁₇H₃₅)₂. Classified as a metallic soap, this a white solid is used as a lubricant and as a heat- and light-stabilizer in polyvinyl chloride. The use of cadmium stearate is being phased out because of its toxicity.

Cadmium stearate

Names
IUPAC name Cadmium dioctadecanoate
Other names Cadmium distearate; Cadmium(II) stearate; Cadmium(II) dioctadecanoate
Identifiers
CAS Number	2223-93-0 Y
3D model (JSmol)	Interactive image
ChemSpider	15818
ECHA InfoCard	100.017.040
EC Number	218-743-6
PubChem CID	16681
UNII	GBI2ILV46J Y
CompTox Dashboard (EPA)	DTXSID30890557
InChI InChI=1S/2C18H36O2.Cd/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
SMILES [Cd+2].[O-]C(=O)CCCCCCCCCCCCCCCCC.[O-]C(=O)CCCCCCCCCCCCCCCCC
Properties
Chemical formula	C36H70CdO4
Molar mass	679.366 g·mol−1
Appearance	White powder
Density	1.80 g/cm3
Melting point	134 °C (273 °F; 407 K)
Hazards
NFPA 704 (fire diamond)	4 0 0
NIOSH (US health exposure limits):
PEL (Permissible)	[1910.1027] TWA 0.005 mg/m3 (as Cd)[1]
REL (Recommended)	Ca[1]
IDLH (Immediate danger)	Ca [9 mg/m3 (as Cd)][1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

The compound is produced by the reaction of cadmium chloride with sodium stearate or heating stearic acid and cadmium oxide or hydroxide.^[2] Also, an exchange reaction between cadmium sulfate and sodium stearate:

CdSO₄ + 2 NaC₁₈H₃₅O₂ → Cd(C₁₈H₃₅O₂)₂↓ + Na₂SO₄

Safety

Like other cadmium compounds, cadmium stearate is toxic.^[3] Cadmium stearate is also carcinogen.^[4]