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2,6-Di-tert-butylphenol (2,6-DTBP)

  • Antioxidants
  • CAS 128-39-2
  • IUPAC: 2,6-di-tert-butylphenol

2,6-Di-tert-butylphenol (2,6-DTBP) (CAS 128-39-2) appears in 2 of the 1,812 car-care products CarCareTruth tracks (as of June 2026).

H315 (skin irritation Cat 2) at the substance level. Low acute toxicity. At 1-5% in a diesel treatment formulation, the skin irritation classification may not propagate to the mixture level.

2,6-Di-tert-butylphenol (CAS 128-39-2) is a hindered phenol antioxidant commonly used in fuel additives, lubricants, and polymer stabilization. In diesel treatment products, it prevents oxidative degradation of the active ingredients (particularly the cetane improver and detergent actives) during storage. At the substance level it carries only H315 (skin irritation Cat 2) — a relatively benign profile for an industrial chemical. The low vapor pressure and high molecular weight mean minimal inhalation exposure at room temperature.

Health & environment profile

VOC
no
Prop 65 listed
no
Asthmagen
no
EPA Safer Choice
no
Aquatic toxicity
no
Biodegradable
no
Bioaccumulative
no
Persistent
no
Ozone depleting
no
Microplastic
no
PFAS
no
Env. score
5/5
Purpose: Hindered phenol antioxidant used to prevent oxidative degradation of fuel additives and lubricants during storage.

Common questions about 2,6-Di-tert-butylphenol (2,6-DTBP)

What is 2,6-Di-tert-butylphenol (2,6-DTBP) used for in car care?
Hindered phenol antioxidant used to prevent oxidative degradation of fuel additives and lubricants during storage.
Is 2,6-Di-tert-butylphenol (2,6-DTBP) a VOC?
No. 2,6-Di-tert-butylphenol (2,6-DTBP) is not classified as a volatile organic compound (VOC).
Is 2,6-Di-tert-butylphenol (2,6-DTBP) on California's Proposition 65 list?
No. 2,6-Di-tert-butylphenol (2,6-DTBP) is not on California's Proposition 65 list.

2 products 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.