Undecan-1-ol Ethoxylated

Undecan-1-ol ethoxylated is a nonionic fatty alcohol ethoxylate surfactant used as an emulsifier and wetting agent in polishes, cleaners, and coatings. In glass polishes, it aids dispersion of cerium oxide abrasive particles and improves contact with glass surfaces.

The primary hazard is the highly alkaline pH of the mixture (pH 10–11 in the 3D Glass Polish formula), which drives the H318 (serious eye damage) classification at the product level. The ingredient itself has low acute systemic toxicity but causes serious eye damage through the pH mechanism.

Aquatic toxicity is confirmed by LC50 fish data (3.9 mg/L from ECOTOX), placing it in the range consistent with H411 chronic aquatic classification at the ingredient level. The mixture-level 3D Glass Polish SDS §2 does not classify H4xx at the mixture level, but the ingredient-level aquatic toxicity data is documented in SDS §12.

Regulatory status

• Not California Prop 65 listed: no entry for undecan-1-ol ethoxylated or CAS 34398-01-1 on the OEHHA list. A prior version of this file asserted prop65_listed: true on the basis of a trace ethylene oxide residual from the manufacturing process. Ethylene oxide (CAS 75-21-8) is a separately, genuinely Prop 65-listed substance with its own ingredient file (content/ingredients/ethylene-oxide.md); a product whose SDS discloses ethylene oxide as a distinct §15 item should cite that identity directly, as the consuming products in this catalog already correctly do, rather than inheriting the flag onto this surfactant's own file.

Sources

• OEHHA Proposition 65 list cross-check: data/prop65/oehha-list.json (986 entries, published 2025-12-05), no match by name or CAS 34398-01-1. Ethylene oxide (CAS 75-21-8) confirmed present in the same file (cancer, developmental, and female-reproductive listings).
• Blast-radius check: content/products/3d-car-care/3d-car-care-glass-polish/index.md resolves prop65_warning: true, but its own FAQ and rationale text cite the SDS's direct §15.3 disclosure of ethylene oxide (Oxirane) by name, not this ingredient file's flag, so this correction does not change its published value. content/products/3d-car-care/3d-one-car-scratch-swirl-remover/index.md already resolves prop65_warning: false and is unaffected either way.