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Calcium bis(dinonylnaphthalenesulphonate)

  • Corrosion inhibitors
  • CAS 57855-77-3
  • IUPAC: Calcium bis(dinonylnaphthalenesulphonate)

Calcium bis(dinonylnaphthalenesulphonate) (CAS 57855-77-3) appears in 1 of the 1,812 car-care products CarCareTruth tracks (as of June 2026).

Not classified as a health hazard at the ingredient level in typical concentrations in formulated products. No H-codes assigned to this substance in SDS §3 context. No Prop 65 listing.

Calcium bis(dinonylnaphthalenesulphonate) is an oil-soluble overbased calcium sulfonate corrosion inhibitor commonly used in synthetic lubricants, penetrating oils, and metalworking fluids. It forms a hydrophobic protective film on metal surfaces that resists water intrusion and inhibits rust formation — making it a key component of penetrating oils that claim long-term corrosion protection after application.

The compound has documented aquatic toxicity (fish LC50 0.28 mg/L — classified as very toxic to aquatic organisms at this threshold) per independent ecotoxicological studies. It is not considered readily biodegradable and not bioaccumulative (low BCF). Environmental exposure is typically low in consumer applications due to the small quantities applied to fasteners.

Health & environment profile

VOC
no
Prop 65 listed
no
Asthmagen
no
EPA Safer Choice
no
Aquatic toxicity
yes
Biodegradable
no
Bioaccumulative
no
Persistent
no
Ozone depleting
no
Microplastic
no
PFAS
no
Env. score
2/5
Purpose: Oil-soluble corrosion and rust inhibitor — forms a protective hydrophobic film on metal surfaces to resist moisture and prevent rust formation. Used in synthetic lubricants and penetrating oils.

Common questions about Calcium bis(dinonylnaphthalenesulphonate)

What is Calcium bis(dinonylnaphthalenesulphonate) used for in car care?
Oil-soluble corrosion and rust inhibitor — forms a protective hydrophobic film on metal surfaces to resist moisture and prevent rust formation. Used in synthetic lubricants and penetrating oils.
Is Calcium bis(dinonylnaphthalenesulphonate) a VOC?
No. Calcium bis(dinonylnaphthalenesulphonate) is not classified as a volatile organic compound (VOC).
Is Calcium bis(dinonylnaphthalenesulphonate) on California's Proposition 65 list?
No. Calcium bis(dinonylnaphthalenesulphonate) 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.