StructureOctylphosphonic acid
CAS No. 4724-48-5
EC No. 225-218-5
Synonyms n-Octylphosphonic acid; Phosphonic acid, octyl-; 1-octyl phosphonic acid; Phosphonic, p-octyl-

Octylphosphonic acid

OPA 80% is an 80% solution 1-octyl phosphonic acid / OPA 97% is a 97% version of 1-octyl phosphonic acid. The material is used as a surface modifier, chelant and in the sodium and potassium salt forms has surfactant properties useful in the formulation of hard surface cleaners.


  • Application: Pigments
  • Surface Modification
  • Pearlescent pigments
  • ​Metallic flake pigments

Pigments become suitable for powder coating formulations. OPA improves luminance and flop of powder formulations

Improved chroma results. 

Example data below

Formulation      Luminance        Chroma

1% OPA              32            6.5

Control               27            0.4

  • Aluminum flake pigment stabilization; improved gassing performance up to 50%
  • stain inhibitor for aluminum surfaces Application: Cleansers
  • ​wetting agent
  • scale remover
  • corrosion inhibitor

Research projects were already implemented for:

  • mixed self-assembled layers of phosphonic acids
  • low adhesion, non-wetting phosphonate self-assembled monolayer films formed on copper oxide surfaces
  • study of the self-assembling of n-octylphosphonic acid layers on aluminum oxide
  • ​​fabrication of DNA nanowires by orthogonal self-assembly and DNA intercalation on a Au patterned Si/SiO2 surface


Shelf Life

Under proper storage conditions, the shelf life is 12 months from the certification date.

Health & Safety

Detailed information on the product described can be found in our relevant Health and Safety Information (Material Safety Data Sheet)