Titanium Dioxide

Titanium dioxide (TiO2, CAS 13463-67-7) is a white inorganic pigment used universally in coatings, sunscreens, and UV-protective formulations. In headlight UV sealant wipes, it serves as both a UV-blocking agent and opacifying pigment. It is chemically inert in typical consumer use and presents no meaningful aquatic toxicity in particle form.

The California Prop 65 listing applies specifically to airborne, unbound particles of respirable size — an occupational inhalation hazard from dry powder handling, not from consumer use of liquid or wipe products where TiO2 is bound in the formula matrix. SDS §15 lists TiO2 under Prop 65 for these products because the listing is ingredient-level and applies regardless of physical state in the consumer product. Products containing TiO2 technically require Prop 65 labeling, even when the actual inhalation pathway doesn't exist in consumer use.

Note: this slug is distinct from titanium-dioxide-pigment used in automotive paint and coating products. The underlying chemical is identical (CAS 13463-67-7); the separate slug reflects different product context and purpose text.

Regulatory status

• California Prop 65 listed for cancer: "Titanium dioxide (airborne, unbound particles of respirable size)," listed 2011-09-02 (mechanism: Labor Code). The OEHHA listing carries no CAS number of its own, a category-style listing scoped to the airborne-respirable-particle exposure route, the same pattern as this catalog's crystalline-silica and sulfuric-acid-mist listings, and is matched here by name rather than by CAS 13463-67-7 directly.

Sources

• OEHHA Proposition 65 list cross-check: data/prop65/oehha-list.json (986 entries, published 2025-12-05), name match "Titanium dioxide (airborne, unbound particles of respirable size)," cancer, dateListed 2011-09-02, no CAS assigned. Found and documented while validating the content:audit-prop65-citations checker built in this same pass; this file previously asserted prop65_listed: true without a Sources or Regulatory status section, which the checker correctly flagged as unverifiable on its face even though the underlying flag is accurate.