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CarCareTruth

Polyoxyethylene Dinonylphenyl Phosphate

  • Nonionic surfactants
  • CAS 39464-64-7

Polyoxyethylene Dinonylphenyl Phosphate (CAS 39464-64-7) appears in 1 of the 2,122 car-care products CarCareTruth tracks (as of August 2026).

Severe skin corrosion (H314) and serious eye damage (H318) in pure form. At 0.1–1% concentration in end-use penetrating oil formulations, direct contact risk is reduced but gloves are appropriate for prolonged handling. No classification as sensitizer or reproductive toxin.

Polyoxyethylene dinonylphenyl phosphate is a phosphate ester nonionic surfactant used as a corrosion inhibitor and penetration aid in metalworking fluids and penetrating oils. It belongs to the nonylphenol ethoxylate (NPEO) derivative family.

In penetrating oil formulations it helps displace water from metal surfaces and provides a corrosion-inhibiting layer. The H314 (skin corrosion) and H318 (serious eye damage) classifications apply to the pure substance — at 0.1–1% in the finished product, the mixture-level classification for skin/eye effects is driven by the overall product GHS classification, not this ingredient alone.

The nonylphenol scaffold raises environmental concerns related to endocrine disruption potential, consistent with the NPEO family designation as substances of very high concern (SVHC) in some regulatory frameworks. At trace concentrations in aerosol penetrant formulations, direct aquatic exposure during use is primarily through indirect pathways (drainage).

Health & environment profile

VOC
no
Prop 65 listed
no
Asthmagen
no
EPA Safer Choice
no
Aquatic toxicity
yes
Biodegradable
no
Bioaccumulative
no
Persistent
yes
Ozone depleting
no
Microplastic
no
PFAS
no
Env. score
2/5
Purpose: Corrosion inhibitor, wetting agent

Common questions about Polyoxyethylene Dinonylphenyl Phosphate

What is Polyoxyethylene Dinonylphenyl Phosphate used for in car care?
Corrosion inhibitor, wetting agent
Is Polyoxyethylene Dinonylphenyl Phosphate a VOC?
No. Polyoxyethylene Dinonylphenyl Phosphate is not classified as a volatile organic compound (VOC).
Is Polyoxyethylene Dinonylphenyl Phosphate on California's Proposition 65 list?
No. Polyoxyethylene Dinonylphenyl Phosphate is not on California's Proposition 65 list.

1 product contain this

Related

Health and environment notes translate the manufacturer Safety Data Sheet, the GHS classification, and authoritative regulatory listings (California Prop 65, EPA). Not medical advice. They describe the ingredient itself; whether a hazard applies to a finished product depends on its concentration and how it's used.