Products Description of Zinc stearate CAS#557-05-1
Zinc stearate is a white, lightweight, and fine powder. Its molecular formula is Zn(C₁₇H₃₅COO)₂, with a molecular structure of RCOOZnOOCR—where R represents the mixed alkyl groups in industrial stearic acid. It is flammable, having a specific gravity of 1.095, an autoignition point of 900℃, a density of 1.095, and a melting point of 130℃, along with a greasy texture.
It is insoluble in water, ethanol, and ether, but soluble in hot ethanol, turpentine, benzene, and other organic solvents as well as acids (per Chemicalbook). When heated and dissolved in organic solvents, zinc stearate forms a colloid upon cooling; it decomposes into stearic acid and the corresponding zinc salt when in contact with strong acids.
It possesses properties such as lubricity, hygroscopicity, non-toxicity, slight irritation, non-pollution, and non-hazardousness. The separation of zinc stearate from calcium stearate can be achieved by leveraging their differing solubility in benzene—zinc stearate is soluble in benzene, while calcium stearate is not.
Parameters
Melting point | 128-130 °C (lit.) |
Boiling point | 240℃[at 101 325 Pa] |
density | 1.095g/cm3 |
vapor pressure | 0Pa at 25℃ |
Fp | 180℃ |
storage temp. | Inert atmosphere,Room Temperature |
solubility | alcohol: insoluble(lit.) |
form | Powder |
color | White |
Odor | wh. powd., faint char. odor |
Water Solubility | Insoluble |
Merck | 14,10158 |
BRN | 3919706 |
Exposure limits | ACGIH: TWA 10 mg/m3; TWA 3 mg/m3 |
Stability: | Stable. Incompatible with strong oxidizing agents. |
LogP | 4.64 at 25℃ |
CAS DataBase Reference | 557-05-1(CAS DataBase Reference) |
NIST Chemistry Reference | Zinc(II) n-octadecanoate(557-05-1) |
EPA Substance Registry System | Zinc stearate (557-05-1) |
Safety Information
Hazard Codes | Xi |
Risk Statements | 37 |
Safety Statements | 22-26-36/37/39-38-24/25 |
OEB | B |
OEL | TWA: 10 mg/m3 (total) |
WGK Germany | - |
RTECS | ZH5200000 |
Autoignition Temperature | 1454 °F |
TSCA | Yes |
HS Code | 29157090 |
Hazardous Substances Data | 557-05-1(Hazardous Substances Data) |
Toxicity | LD50 oral in rat: > 10gm/kg |
Product Application of Zinc stearate CAS#557-05-1
Zinc stearate finds application in the pharmaceutical industry, where it is used in formulating curing oils and lubricants, and also serves as a paint drier. It is widely utilized in the processing of PVC and non-toxic rubber products. When combined with calcium stearate and barium stearate, it exerts a synergistic effect, effectively enhancing the light and heat stability of PVC and rubber products. In PVC processing, its dosage is typically less than 1 part. Additionally, it acts as a touch modifier for rubber products and is employed in the production of polymerization additives for PP, PE, PS, and EPS, as well as in pencil lead manufacturing, with a general dosage ranging from 1 to 3 parts.
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