Hello!

SUNSIL-S45 is a porous silica-based UV solution containing 45% BEMT, designed for easy dispersion in the water phase.
Recently, K-beauty sun care products have achieved remarkably lightweight textures even at SPF50+ PA++++ levels. However, developing formulations that simultaneously deliver high UV filter loading, formulation stability, and a fresh skin feel remains a significant challenge.

SUNSIL-S45 helps optimize the dispersion of UV filters and their distribution on the skin, enabling higher SPF efficiency and a lighter sensory feel even with the same level of UV filter content.

■ Why Do High-SPF Formulations Tend to Feel Heavy?

Conventional sun care formulations rely on dissolving organic UV filters into the oil phase.
In particular, high-molecular-weight UV filters such as BEMT become increasingly difficult to solubilize at higher concentrations. As a result, the oil phase ratio must be increased to accommodate the filters, causing formulations to feel heavier and stickier.
In other words, conventional formulations often face a structural limitation where increasing UV protection comes at the expense of sensory performance.

■ A Shift in Approach: Redesigning the UV Protection System

Rather than concentrating the formulation burden in a single phase, we approached the challenge by redesigning the formulation structure itself.
To achieve a lightweight, fast-spreading, and comfortable sensory feel, conventional oil-dependent systems inevitably face limitations.
SDesigned to align with this new approach, SUNSIL-S45 is engineered to disperse and function within the water phase,the external phase of O/W formulations.
By incorporating organic UV filters in an encapsulated form, SUNSIL-S45 moves beyond the conventional oil phase-focused structure, enabling greater flexibility in formulation design.
With SUNSIL-S45, formulators can create low-viscosity sunscreen formulations that deliver both a fresh skin feel and high SPF/PA performance without relying heavily on oil-based systems.

■ A Noticeable Difference on the Skin

Formulations containing SUNSIL-S45 create a noticeable difference from the moment of application.
The UV filters dispersed in the water phase spread thinly and evenly across the skin without aggregating in one area, helping reduce greasiness while providing smooth adhesion and a fresh, refined sensory feel.
While the formulation feels lightweight on the skin, a uniform UV protection network is formed internally, helping maintain stable and reliable UV protection performance.

UL2700_Tone Correcting Daily Sun Cream

■ SUNSIL-S45 Sets a New Standard for Powerful UV Protection and Lightweight Sensory Feel — A Game Changer in Sun Care

Even under the same BEMT loading conditions, formulations containing SUNSIL-S45 demonstrated significantly improved SPF/PA performance. And the impact goes far beyond numerical results alone.
What makes the difference even more remarkable is the sensory experience. While higher SPF levels typically lead to heavier and stickier textures, formulations with SUNSIL-S45 can achieve a lighter, fresher, and faster-spreading skin feel.
In other words, SUNSIL-S45 helps overcome the conventional limitations between UV protection performance and sensory elegance at the same time.
No longer compromise between performance and feel.
SUNSIL-S45 sets a new standard for modern sun care formulations.

🔎 Summary Q&A
■ Q1. Why does SUNSIL-S45 improve SPF efficiency?
A. SUNSIL-S45 is a UV solution in which BEMT is encapsulated within a porous silica structure, enabling uniform dispersion in the water phase. By promoting the formation of a thinner and more uniform UV film on the skin, it can help achieve higher SPF/PA efficiency even at the same UV filter loading. In other words, rather than simply increasing the amount of UV filters, SUNSIL-S45 enhances UV protection efficiency by optimizing the dispersion and distribution of UV filters.

■ Q2. What formulation advantages does SUNSIL-S45 offer compared to using BEMT directly?
A.Conventional sun care formulations typically rely on dissolving organic UV filters into the oil phase, and high-SPF formulations often become heavier as the oil phase ratio increases.
As a water-phase dispersible particulate UV solution, SUNSIL-S45 helps reduce the formulation burden on the oil phase, enabling lighter and fresher formulation design. In particular, it can be effectively utilized in O/W formulations to deliver differentiated sensory performance in terms of spreadability, after-feel, reduced stickiness, and overall finish.

■ Q3. How can SUNSIL-S45 disperse organic UV filters in the water phase?
A. Unlike conventional organic UV filters that are simply dissolved in oil, SUNSIL-S45 is designed with a porous silica-based structure that enables stable dispersion in the water phase.
This approach helps reduce oil-phase dependency, allowing the development of lighter and fresher O/W sun care formulations.

■ Q4. What types of sun care formulations can SUNSIL-S45 be applied to?
A. Unlike conventional organic UV filters that are simply dissolved in oil, SUNSIL-S45 is designed with a porous silica-based structure that enables stable dispersion in the water phase.
SUNSIL-S45 can be applied to a wide range of lightweight sun care formulations, including O/W sunscreens, fluids, lotions, and tone-up sun care products. It is particularly suitable for K-beauty sun care formulations that aim to maintain a fresh and lightweight skin feel even at high SPF levels, while also being versatile for daily sun care applications.

If you have any inquiries regarding the related products, please feel free to contact us using the information below.

Areum Jeong / Regional Sales Manager
E-mail : sales1@sunjinbs.com