Molecular Structure:

Molecular Formula: C₁₈H₃₅O₂
Molecular Weight: 283.4698
IUPAC Name: Octadecanoate
Synonyms of Stearate (CAS NO.646-29-7): Octadecanoate ; Octadecanoic acid, ion(1-) ; Stearic acid, ion(1-) (8CI)
CAS NO: 646-29-7 
Flash Point: 162.4 °C
Enthalpy of Vaporization: 63.84 kJ/mol
Boiling Point: 359.4 °C at 760 mmHg
Vapour Pressure: 8.58E-06 mmHg at 25°C

  Stearate (CAS NO.646-29-7) is the anion form of stearic acid. Formula is C₁₇H₃₅COO⁻.  Stearate is a salt or ester of stearic acid. 
 Stearic acid is a colorless, odorless, waxlike fatty acid, occurring in natural animal and vegetable fats and used in making soaps, candles, lubricants, and other products
 Stearic Acid is a typical example of a fatty acid, which are essentially long hydrocarbon chains containing a carboxyl group at one end and a methyl group at the other. The chain lengths can vary from 3 (propionic acid) to 24 (lignoceric acid) but the majority of fatty acids found in hydrogenated vegetable or animal oils are around C16-C20 in length. Stearic acid is a saturated acid, since there are no double bonds between neighbouring carbon atoms. This means that the hydrocarbon chain is flexible and can roll up into a ball or stetch out into a long zig-zag.