Reef-Safe Sunscreen Regulations

The "reef-safe sunscreen" regulatory environment has emerged since 2018 as multiple jurisdictions have banned organic UV filters linked to coral reef damage. Physical / mineral sunscreens — those using TiO2 and ZnO as the active UV filters — are explicitly permitted and are positioned as the compliant alternative.

Hawaii Act 104 (effective January 1, 2021): - Bans sunscreen products containing oxybenzone or octinoxate - Applies to sale and distribution in Hawaii (not personal possession) - Affects all sunscreen products sold in Hawaii regardless of brand or country of manufacture - Penalties: $100k+ per violation

Compliant alternatives: - TiO2 + ZnO physical filter sunscreens - Sunscreens using other approved organic filters (avobenzone, octocrylene, homosalate — currently permitted)

Palau (effective January 1, 2020): The most comprehensive reef-protection sunscreen law globally. Bans: - Oxybenzone - Octinoxate - Octocrylene - 4-methylbenzylidene camphor - Triclosan - Methyl paraben - Ethyl paraben - Butyl paraben - Benzyl paraben - Phenoxyethanol

Penalties up to $1000 per violation. Confiscation of non-compliant sunscreens at airport.

Compliant alternatives in Palau: physical sunscreens with nano TiO2 + nano ZnO are essentially the only sunscreens permitted.

Mexico — Quintana Roo (Riviera Maya region): Voluntary "biodegradable sunscreen" regulations in Cozumel, Tulum, and other Quintana Roo destinations. Many cenotes and natural pools require biodegradable/mineral sunscreen for entry. Physical filter sunscreens (nano TiO2 + ZnO) widely accepted.

Bonaire (Caribbean): Adopted similar bans to Hawaii effective 2021.

Aruba, US Virgin Islands, Florida Keys (partial): Various local jurisdictions have adopted similar restrictions or have proposed legislation.

Scientific basis: Multiple studies link organic UV filters (oxybenzone, octinoxate) to coral bleaching and reproductive disruption in marine organisms. Physical filters (TiO2, ZnO) — particularly nano-sized with surface coating — are not implicated in equivalent damage.

Why nano TiO2 is reef-safe: - The hydrophobic silica + organosilane coating prevents TiO2 dissolution in seawater - TiO2 particles wash off intact and settle to sediment without organic toxicity - The photocatalytic activity is suppressed by the surface coating - Multiple ecotoxicological studies show no measurable damage to reef organisms at typical environmental concentrations

Formulation for reef-safe sunscreens: - Active UV filters: SEMITI NANO-30 (6–10%) + nano ZnO (3–5%) - Carrier system: caprylic/capric triglyceride or cyclomethicone (no organic filters) - Emulsifier: avoid parabens and triclosan if targeting Palau market - Preservatives: tocopherol acetate, sorbic acid acceptable; parabens and phenoxyethanol prohibited in Palau

SPF outcomes: - SPF 30: 7–8% SEMITI NANO-30 + 4% nano ZnO - SPF 50: 10% SEMITI NANO-30 + 5% nano ZnO + 1% avobenzone (where permitted) - For Palau-compliant SPF 50: physical-filter only, may need 12% NANO-30 + 6% ZnO

Labeling claims: - "Reef-safe" is not a regulated term in most jurisdictions but is commonly used - "Reef-friendly" similarly used - "Hawaii Act 104 compliant" / "Palau compliant" are more specific and defensible - "Mineral sunscreen" / "physical sunscreen" — common positioning for physical-filter products

Consumer demand: The reef-safe sunscreen category has grown 40%+ year-over-year in major markets (Hawaii, Caribbean, Australia, Pacific Islands). Brands launching mineral sunscreen lines specifically: La Roche-Posay, Supergoop!, Stream2Sea, Sun Bum, ThinkSun, and many regional brands.

SEMITI position in reef-safe market: SEMITI NANO-30 is the cost-competitive nano TiO2 for reef-safe sunscreen formulations. Major brand-name products historically used Kobo, Croda, BASF Z-COTE — all premium-priced. SEMITI provides matched performance at 30–50% lower delivered cost, opening the mineral sunscreen category to mid-tier and emerging brands.