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CarCareTruth

Zirconium tetrabutanolate

  • Ceramic (SiO₂)
  • CAS 1071-76-7
  • IUPAC: Tetrakis(butoxy)zirconium

Zirconium tetrabutanolate (CAS 1071-76-7) appears in 2 of the 2,122 car-care products CarCareTruth tracks (as of August 2026).

Classified Eye Irrit. 2 (H319 — causes serious eye irritation) and Skin Sens. 1 (H317 — may cause an allergic skin reaction). Present at <0.5% in the T1 formulation; H319 and H317 are ingredient-level classifications. At this low concentration, the mixture-level contribution is limited, but H317 at any concentration can drive sensitizer classification in the overall mixture.

Zirconium tetrabutanolate (Zr(OBu)₄, CAS 1071-76-7) is a metal alkoxide used as an adhesion promoter and crosslinker in surface coating formulations. In tire dressings and trim coatings, it forms covalent zirconate bonds with surface hydroxyl groups on rubber and plastic substrates, contributing to the durable adhesion that distinguishes a coating from a traditional dressing.

The mechanism is a sol-gel reaction: butoxide groups hydrolyze in the presence of atmospheric moisture or surface-bound water, releasing butanol and forming Zr–O–surface linkages. At <0.5% concentration in a petroleum-carrier formulation, the crosslinking contribution is real but modest — this ingredient explains the "bonding" durability claim rather than providing a thick protective film.

The H317 (skin sensitizer) classification at the ingredient level is important: even at <0.5%, this ingredient is the driver of the mixture-level H317 classification in the T1 SDS. Users with known metal-alkoxide sensitivities should use gloves. The ingredient is TSCA-listed and has no Prop 65 relevance.

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: Crosslinking agent and adhesion promoter in tire coatings and surface treatments; reacts with surface hydroxyl groups to form durable zirconate bonds

Common questions about Zirconium tetrabutanolate

What is Zirconium tetrabutanolate used for in car care?
Crosslinking agent and adhesion promoter in tire coatings and surface treatments; reacts with surface hydroxyl groups to form durable zirconate bonds
Is Zirconium tetrabutanolate a VOC?
No. Zirconium tetrabutanolate is not classified as a volatile organic compound (VOC).
Is Zirconium tetrabutanolate on California's Proposition 65 list?
No. Zirconium tetrabutanolate 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.