2,4,6-TTBP (Tris(tert-butyl)phenol)

2,4,6-TTBP (CAS 732-26-3) is an antioxidant in fuel additives and oil/lubricant products. After January 6, 2026: distribution above 0.3% in containers under 35 gallons is prohibited; processing/distribution of oil/lubricant additives above 0.3% is prohibited. Distributors must keep 3-year records.

40 CFR § 751.409; EPA Final Rule (January 2021).

Narrowly targeted at fuel additives and lubricant products. Verify 2,4,6-TTBP concentrations against the 0.3% threshold. Three-year recordkeeping (shorter than five-year for DecaBDE/PIP 3:1).

A fuel additive manufacturer sells injector cleaner with 2,4,6-TTBP at 0.5% in 12-oz containers. After January 2026, this product must be reformulated below 0.3%.