Titanium Dioxide Anatase, Cosmetic Grade Filler 25kg – KT-10010

Anatase vs. Rutile TiO₂ — Selecting the Right Grade

Both anatase (KT-10010) and rutile (KT-10009) are cosmetic grade TiO₂, but their physical properties create meaningful formulation differences. Understanding where each grade performs best prevents specification errors during product development.

Common specification error: using anatase TiO₂ in mineral sunscreen formulations. Anatase has higher photocatalytic activity, which can degrade organic sunscreen co-ingredients and other organic components in the formulation under UV exposure. For SPF-rated products, rutile is the established industry standard. Anatase is most appropriate where UV filter function is not required and the brighter white tone or softer coverage character is a formulation advantage.

Technical Specifications

Key Characteristics for Formulation

Brighter, cooler white tone: Anatase TiO₂ has a slightly higher blue-white reflectance compared to rutile. In face powder and loose powder formulations, this can produce a brighter, fresher finish — an effect that some formulators deliberately choose over the warmer neutral white of rutile when the target aesthetic is a cool, luminous complexion rather than full matte coverage. The difference is subtle but perceptible in side-by-side comparison at equivalent loading levels.

Softer, more diffuse coverage character: The lower refractive index of anatase (~2.55 vs. ~2.70 for rutile) produces a less intense opacity per gram. At equivalent use levels, anatase gives a slightly softer, more skin-like coverage compared to the denser opacity of rutile. For translucent-to-medium coverage pressed powders and finishing powders where the goal is to even skin tone rather than fully cover it, this property can be an advantage. Full-coverage concealer and foundation applications are better served by rutile.

Photocatalytic activity — the key formulation constraint: Anatase TiO₂ generates reactive oxygen species under UV exposure more readily than rutile. In cosmetic formulations containing organic oils, synthetic esters, dyes, or fragrance compounds, this can contribute to ingredient degradation during the product's shelf life — particularly in transparent or translucent packaging where UV reaches the formulation. Managing this requires either the inclusion of antioxidants (e.g., tocopherol, BHT), UV-protective packaging, or switching to the rutile grade. For any formulation with significant organic ingredient content and light exposure, stability testing is advisable before specifying anatase at commercial scale.

Dispersion in aqueous systems: Like the rutile grade, KT-10010 is untreated and hydrophilic — it disperses readily in the water phase of O/W emulsions and in aqueous powder bases. For oil-continuous systems, the silicone-treated TiO₂ (KT-10008AS) is the more appropriate choice.

Application Range

Formulation Notes

Antioxidant inclusion for stability: In formulations containing organic oils, esters, or other light-sensitive ingredients, adding a lipid-soluble antioxidant (e.g., tocopherol at 0.1–0.5%) can reduce oxidative degradation risk associated with anatase's photocatalytic activity. UV-protective packaging (opaque or UV-blocking containers) provides additional mitigation for products with extended shelf-life requirements.

Dispersion protocol: Pre-disperse KT-10010 into a small volume of water or humectant (glycerin, propylene glycol) before incorporating into the main batch. For pressed powder applications, blend using a plough share or ribbon mixer at low shear — the hydrophilic surface of the untreated grade distributes evenly in powder bases without requiring wetting agents.

Shade development with cool-white base: The blue-white tone of anatase TiO₂ can shift the overall shade of a formulation slightly cooler compared to rutile at equivalent loading. When developing shades that require a warm or neutral white base, this effect should be accounted for in initial color matching trials — or compensated with a small addition of a warm-toned pigment.

Kolortek has supplied cosmetic grade TiO₂ and functional fillers for over 20 years, with Certificate of Analysis documentation covering heavy metal impurity levels issued per production lot. TDS, SDS, and INCI declarations are available on request for supplier qualification and regulatory submission purposes.

Frequently Asked Questions

Q: Why would a formulator choose anatase over rutile TiO₂?
A: Two reasons are common in practice. First, anatase produces a slightly brighter, cooler blue-white tone — useful in finishing powders, highlight shades, and pastel eye shadows where a cool, luminous white is the target aesthetic. Second, anatase has a lower refractive index, which creates a more diffuse, softer coverage character — better suited to translucent finishing powders than to full-coverage concealers. For applications where maximum opacity, UV filter function, or formulation stability with organic co-ingredients are priorities, rutile (KT-10009) is the more appropriate grade.

Q: Can KT-10010 be used in sunscreen formulations?
A: Anatase TiO₂ is generally not the recommended grade for sunscreen applications. Its higher photocatalytic activity under UV exposure can degrade organic ingredients in the formulation, including other UV filters, oils, and preservatives. The established industry practice for mineral sunscreen formulations is to use rutile TiO₂, which has significantly lower photocatalytic activity. Kolortek's rutile grade KT-10009, or the silicone-treated rutile KT-10008AS for anhydrous systems, are the appropriate specifications for SPF-rated products.

Q: Is KT-10010 approved for use in eye-area cosmetics?
A: CI 77891 (Titanium Dioxide) is approved for eye-area use under both EU Annex IV of the EU Cosmetics Regulation and FDA cosmetic colorant regulations. The anatase crystal phase does not affect the regulatory approval status — both rutile and anatase are listed under the same CI number. Formulators should verify current approved use conditions for their specific product type and target market.

Q: How do I manage the photocatalytic activity risk in my formulation?
A: Three approaches are used in practice: (1) include a lipid-soluble antioxidant such as tocopherol (vitamin E) at 0.1–0.5% to scavenge free radicals generated at the TiO₂ surface; (2) use UV-protective or opaque packaging to limit UV exposure to the formulation during storage; (3) if the photocatalytic risk is significant given your specific ingredients, switch to the rutile grade (KT-10009 or KT-10008AS). Accelerated stability testing under light exposure is the most reliable way to confirm whether the anatase grade is appropriate for your specific formulation.

Request Samples or Technical Documentation

Whether you are developing a new finishing powder range, evaluating the anatase versus rutile grade decision for an existing foundation, or sourcing a consistent cosmetic grade TiO₂ for commercial production, contact Kolortek to request a sample of KT-10010, TDS, SDS, or Certificate of Analysis for supplier qualification documentation. Formulation guidance on dispersion and photocatalytic activity management is available from the technical team.