Oleic is an unsaturated fatty acid that contributes to the conditioning/moisturizing abilities of a soap. Oleic acid is what makes olive oil loved by soapmakers far and wide. Oleic is an unsaturated fatty acid that contributes to the conditioning/moisturizing abilities of a soap. Oleic acid is what makes olive oil loved by soapmakers far and wide. Formula: C18H34O2 Synonyms: cis-Delta-9-octadecanoate; 9-Octadecenoic acid (Z)-; cis-9-Octadecenoic acid; cis-octadec-9-enoic acid; century cd fatty acid; emersol 210; emersol 213; emersol 6321; emersol 233ll; glycon ro; glycon wo; cis-delta(sup 9)-octadecanoic acid; 9-octadecenoic acid; wecoline oo; tego-oleic 130; vopcolene 27; groco 2; groco 4; groco 6; groco 5l; hy-phi 1055; hy-phi 1088; hy-phi 2066; K 52; neo-fat 90-04; neo-fat 92-04; hy-phi 2088; hy-phi 2102; Metaupon; red oil; (Z)-9-Octadecen.Often used for making special soaps and as soldering flux for soldering lead came and lead parts. Also used as emulsifier. Additional Description CAS # [112-80-1]C18H34O2 Yellow to red oily liquid; lardlike odor; darkens on exposure to air. insoluble in water;soluble in alcohol,ether and most organic solvents.Combustible; nontoxicTypical Analysis:Oleic Acid 67% – 77% Linoleic Acid 5% – 15% Stearic Acid < 4% Palmitolic Acid < 10% Palmitic Acid < 10% Myristic Acid < 4% Iodine Value = 95 Acid Number: 198 - 204 Unsap : < 1% Oleic acid is used in making soaps in order to provide conditioning, slippery feel, stingy lather, kind to skin.