ShieldBiso™ S: High-Efficiency Broad-Spectrum UV Filter

High-SPF sunscreen formulation involves a direct correlation between actives concentration and formulation viscosity. As filter loading increases to meet elevated UV protection targets, total solids content rises. This typically results in increased occlusivity and a heavier skin feel, which can limit consumer acceptance. Bisor Corporation’s ShieldBiso™ S​ (Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine) provides a technical solution based on high absorption efficiency, allowing formulators to achieve target SPF and UVA-PF values without a proportional increase in formulation solids.

UV Absorption and Formulation Efficiency

ShieldBiso™ S is an oil-soluble triazine-based UV filter. Its utility derives from a high molar extinction coefficient across both the UVB (290–320 nm) and UVA (320–400 nm) spectra. In practical application, significant SPF and UVA-PF contributions are observed at incorporation rates between 1% and 3% by weight. This level of efficiency reduces the necessity for high total actives loading. By maintaining a lower solids content, the formulation retains available oil phase capacity. This capacity can be allocated to volatile silicones or lightweight esters. The inclusion of such components serves to improve spreadability and reduce the greasy residual feel on the skin. This approach addresses the common formulation challenge of balancing high protection with acceptable sensory properties.

Photostability and Matrix Compatibility

The chemical structure of ShieldBiso™ S features a tris-phenytriazine backbone. This configuration facilitates photostability through excited-state intramolecular proton transfer (ESIPT). Upon absorption of UV radiation, the molecule rapidly converts electronic energy into thermal energy, which is then dissipated. This mechanism limits the potential for photodegradation of the filter itself during UV exposure. Additionally, ShieldBiso™ S functions as a photostabilizer for butyl methoxydibenzoylmethane (Avobenzone). It reduces the photodegradation rate of Avobenzone, thereby decreasing the requirement for high concentrations of secondary stabilizers such as octocrylene. This compatibility simplifies the complexity of the UV filter matrix. Furthermore, the lipophilic nature of ShieldBiso™ S ensures its solubilization within the oil phase during standard emulsion processing. This stability prevents crystallization and supports the long-term physical integrity of the finished emulsion.

Global Regulatory Compliance

Regulatory approval is a prerequisite for market access. ShieldBiso™ S is listed in the China Safety and Technical Standards for Cosmetics, with a maximum authorized concentration of 10%. It is also included in Annex VI of the EU Cosmetic Regulation (EC) No 1223/2009, permitting use up to 10%. A significant regulatory development occurred in June 2026, when the U.S. Food and Drug Administration (FDA) published its final order establishing Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine as a GRASE (Generally Recognized as Safe and Effective) ingredient for over-the-counter sunscreen drug products, allowing use at concentrations up to 6%. This alignment across the Chinese, European, and U.S. markets provides a harmonized active ingredient option for global brand owners.

Application and Formulation Utility

The primary technical advantage of ShieldBiso™ S is the decoupling of UV efficacy from high formulation solids. This decoupling provides specific formulation benefits. It allows for the reduction of total actives concentration while maintaining label claim substantiation. Reduced loading can contribute to lower raw material costs per unit volume. More critically, the preserved oil phase capacity offers flexibility for the incorporation of sensory modifiers to meet current market demands for lightweight, non-greasy textures. The established toxicological profile and broad regulatory acceptance also serve to reduce the technical risk associated with new product development cycles. In the current personal care market, where performance and aesthetics are equally weighted, ShieldBiso™ S provides a stable technical foundation for advanced suncare formulations.