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IUPAC name
Other names Tristearin; Trioctadecanoin; Glycerol tristearate; Glyceryl tristearate
CAS number 555-43-1 Yes check.svgY
PubChem 11146
Molecular formula C57H110O6
Molar mass 891.48 g/mol
Appearance White powder
Density 0.862 g/cm3 at 80 °C
Melting point

55 °C, 328 K, 131 °F

Solubility in water Insoluble
 Yes check.svgY (what is this?)  (verify)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Stearin (pronounced /ˈstɪərɨn/), or tristearin, is a triglyceride, a glyceryl ester of stearic acid, derived from animal fats created as a byproduct of processing beef. It can also be found in tropical plants such as palm. It is used as tallow in the manufacture of candles and soap. In the manufacture of soap, stearin is mixed with a sodium hydroxide solution in water. The following reaction gives glycerin and sodium stearate, which can be used as soap:

C3H5(C18H35O2) 3 + 3 NaOH → C3H5(OH)3 + 3 C17H35COONa
stearin + 3 sodium hydroxide → glycerol + 3 sodium stearate

Stearin is also used in conjunction with aluminium flakes to help in the grinding process in making dark aluminium powder.

Stearin is a side product obtained during the extraction of cod liver oil removed during the chilling process at temperatures below -5 °C.


  1. ^ Merck Index, 11th Edition, 9669.


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