Phosphoric Acid Esters, Amine Salt

Phosphoric acid esters, amine salt, is a proprietary corrosion-inhibitor additive package disclosed only by chemical class (not specific CAS number) in the Section 3 ingredient table of an aerosol penetrating lubricant's SDS, consistent with the trade-secret withholding permitted under 29 CFR 1910.1200(i). The amine-salt phosphate ester chemistry is a common corrosion-inhibitor mechanism in metalworking and penetrating fluids: the polar phosphate head group adsorbs onto bare metal, displacing surface moisture and forming a thin film that resists re-rusting between applications.

At the trace concentration typical of this additive class (0.1-1%), the ingredient carries its own Section 3 hazard classification (Acute Tox. 4 Oral, Eye Dam. 1, Skin Sens. 1), but the finished product's Section 2 mixture-level classification does not adopt the full severity of the ingredient-level Eye Dam. 1 entry, reflecting the concentration-based cutoff rules under GHS mixture classification. Manufacturers commonly cite trade-secret protection for the specific amine and phosphate ester identity in this additive class.