Titanium dioxide

Nano, Non nano & Non-nano coated

Titanium dioxide has long been a staple in high performance sun protection , but ingredient safety and skin compatibility hinge heavily on particle size and structure

Unlike nano particles that cross cellular barriers, non-nano titanium dioxide features larger particles that remain safely on the surface of the skin, forming an impenetrable and inert protective shield. When enhanced with a dense silica coating and a hydrophobic stearic acid layer, these mineral particles achieve optimal stability, preventing unwanted clumping and reducing surface reactivity while remaining exceptionally gentle for sensitive skin types.

In marine and aquatic ecosystems, the structural difference between nano and non nano mineral filters plays a critical role in environmental safety. While raw nano-scale particles exhibit high photocatalytic activity - generating reactive oxygen species under UV light that can stress delicate marine life, coated non-nano formulations act with significantly lower environmental disruption. The protective silica shell acts as an inorganic buffer, temporarily containing photocatalytic activity and ensuring that the mineral ingredients behave more like stable, natural sediment rather than reactive chemical pollutants in coastal waters.

Ultimately, choosing a coated non-nano titanium dioxide formulation represents a harmonious balance between uncompromised sun safety and ecological mindfulness. By utilizing larger non-penetrating mineral particles anchored by eco-friendly silica coatings, Sunsessions zinc paste brings to you a broad spectrum UV defense that respects both human biology and marine habitats.

Nano Titanium :

• particle size - extremely small (under 100 nanometers) can penetrate compromised skin

• photocatalytic - high reactivity. Generates higher levels of reactive oxygen species under UV light

• environmental & marine impact - higher potential ecotoxicity in shallow coastal water due to high surface area and reactivity - not reef safe!

Uncoated non nano Titanium:

• particle size - larger than 100 nanometers - meaning particles remain on skin surface

• photocatalytic - highly active when exposed to sunlight. Because it lacks a protective coating the raw particles surface directly interacts with UV light, generating reactive oxygen species that can cause the mineral to degrade other cosmetic ingredients or feel more reactive (ex: very dry skin)

• environmental & marine impact - the lack of protective coating means it has raw, unbuffered surface reactivity when suspended in aquatic environments. Reactive oxygen species are highly oxidizing and chemically aggressive. Unbuffered and highly reactive mineral particles have shown in controlled laboratory settings to cause oxidative stress to the cell membranes, proteins and DNA of microalgae, phytoplankton and the early stages of aquatic organisms - not reef safe!

  
  
  
  

Sunsessions zinc mineral sunscreen uses Coated non-nano Titanium but just a very small percentage. Despite the high cost of this type of titanium we have invested to ensure uncompromised safety for our skin and protection for marine ecosystems

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