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SEMITI NANO-30

Nano TiO2 (UV Filter Grade)

Hydrophobic surface-coated nano TiO2 (15–30 nm) for transparent UV protection in sunscreens and BB creams.

International equivalents: Kobo TTO-S-3 · Croda Solaveil CT-300 · BASF Z-COTE HP1

SEMITI NANO-30 is a hydrophobic silica + organosilane surface-coated nano titanium dioxide engineered specifically for personal care sunscreen applications. With a primary particle size of 15–30 nm — below the wavelength of visible light — the powder disperses to give transparent or near-transparent films, while providing broad-spectrum UVA + UVB protection from 280–400 nm.

The surface coating serves two functions: (1) it deactivates the photocatalytic activity that would otherwise oxidize organic UV filters and skin lipids, and (2) it renders the particle hydrophobic and easily dispersible into emollient phases (oils, esters) of W/O and O/W emulsions.

SEMITI NANO-30 is supplied as a free-flowing powder. For sunscreen formulators, the recommended approach is pre-dispersion at 30–40% loading in caprylic/capric triglyceride or cyclomethicone using a high-shear homogenizer or three-roll mill, then letdown into the final emulsion. Typical finished-product dosage is 3–10% TiO2 by weight depending on target SPF.

Why customers pick SEMITI NANO-30

  • 01True nano size (15–30 nm) — transparent film on skin, no chalky white cast typical of micronized TiO2
  • 02Hydrophobic silica + organosilane coating — fully deactivates photocatalysis (verified by EU-EFSA methylene blue assay)
  • 03Broad-spectrum UVA + UVB protection — SPF contribution typically 30–35 at 8% loading in standard emulsion
  • 04Reef-safe / oxybenzone-free alternative — meets Hawaii Act 104, Palau, and Mexican Quintana Roo regulations
  • 05Stable to 5% loading in W/O without significant viscosity increase

Typical specifications

Batch-specific CoA accompanies every shipment.

TiO2 content (after coating)70–80%
Crystal formRutile (preferred for sunscreen — lower photocatalysis vs anatase nano)
Primary particle size15–30 nmTEM
BET surface area60–80 m²/g
Surface coatingSilica (10–15%) + methicone/octylsilane (5–10%)
Photocatalytic activity< 5% of uncoatedMethylene blue bleaching (EFSA)
Carrier dispersibilityPre-dispersible to 40% in C12-15 alkyl benzoate or cyclomethicone
Pb / Cd / As≤ 2 ppm / ≤ 0.5 ppm / ≤ 1 ppm
MicrobiologicalTPC < 100 CFU/g, no E. coli / Salmonella / S. aureus / P. aeruginosa

Typical dosage

Starting points for formulator trials — final loadings should be optimized in-house.

SPF 30 sunscreen (typical W/O)
6–8% finished
Pre-disperse 30–40% in caprylic/capric triglyceride
SPF 50 sunscreen
10–12% finished
Combine with 3–5% nano-ZnO for full UVA-I coverage; verify in vivo if claim required
BB cream / CC cream
3–5%
Co-disperse with iron oxide pigments for shade matching
Tinted moisturizer
1–3%
Low loading enough for SPF 15 daily-wear; verify SPF by in vitro Diffey or in vivo ISO 24444

vs international reference grades

Comparisons against the international grades most commonly cross-referenced by formulators.

Kobo
TTO-S-3

TTO-S-3 is the reference micronized rutile in cosmetic R&D. SEMITI NANO-30 matches it on photoprotection efficiency within 10% and is 50–60% lower delivered cost.

Croda
Solaveil CT-300

Solaveil CT-300 is supplied as a 50% dispersion; SEMITI NANO-30 is supplied as powder for formulators who pre-disperse in-house — more flexible carrier choice, lower cost per kg of active TiO2.

BASF
Z-COTE HP1

Z-COTE is BASF's nano ZnO — different active. Many SPF 50 formulators stack SEMITI NANO-30 (UVB + UVA-II) with a nano-ZnO for full UVA-I. We can supply the matching nano-ZnO on request.

Primary applications

Cosmetics & Sunscreen
Nano TiO2 for transparent UV protection in sunscreen, BB cream, tinted moisturizer — reef-safe, hydrophobic-coated.

Packaging & shipping

10 kg fiber drum with PE liner, double-bagged. Cosmetic-grade pharmaceutical clean line. Photoreactive precautions during transport: keep sealed, avoid direct sunlight on warehouse drums. 12-month shelf life.

Common questions

Is nano TiO2 safe?+
On intact skin, nano TiO2 has been extensively reviewed by EU SCCS, FDA, and Australian TGA — all concluded that micronized/nano rutile TiO2 with proper surface coating does not penetrate the stratum corneum and is safe in sunscreen. The same regulators caution against spray sunscreens containing nano TiO2 because of inhalation risk — for emulsion-based products, no inhalation concern.
Do I need to label 'nano' on my finished sunscreen?+
In the EU, yes (Cosmetic Regulation 1223/2009 Annex VI lists TiO2 only as approved for sunscreen in nano form, with mandatory '[nano]' suffix in INCI). In the US, FDA does not require nano labeling. ASEAN follows EU labeling for export compliance. We provide the full nano material safety dossier on inquiry.
Can SEMITI NANO-30 be used in spray sunscreens?+
We strongly do not recommend it. Aerosolized nano TiO2 has documented pulmonary toxicity in animal studies. EU SCCS 2014 opinion explicitly excludes sprayable applications from the safety assessment for nano TiO2 sunscreen. Use only in lotions, creams, sticks, balms.
What SPF can I expect at 6% loading?+
In a standard W/O emulsion with caprylic/capric triglyceride continuous phase, 6% SEMITI NANO-30 typically delivers in vitro SPF 25–30 (Diffey method) and in vivo SPF 28–35 (ISO 24444). Actual SPF depends heavily on emulsion structure and film-forming behavior — we recommend a small-scale formulation trial first.

Request CoA, sample, or quote for SEMITI NANO-30

We typically respond within 24 hours UTC+8. Free samples for technical evaluation; FOB / CIF / DDP terms to most ports worldwide.

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