Ecamsule （Mexoryl® SX）

Professional-Grade UVA Ultraviolet Protection Ingredient

Ingredient Overview & Key Features

Ecamsule, scientifically known as terephthalylidene dicamphor sulfonic acid and commonly marketed under the trade name Mexoryl® SX, is a high-performance organic UVA ultraviolet absorber specifically designed for sunscreen formulations. It effectively absorbs ultraviolet radiation in the 290–400 nm range, with a maximum absorption peak at approximately 344 nm, providing efficient protection against long-wavelength UVA (UVA I), which is responsible for the most severe damage to the skin.

UVA radiation can penetrate deeply into the dermal layer of the skin, and long-term exposure is associated with premature skin aging, loss of elasticity, and structural damage. Ecamsule is therefore widely incorporated into various sunscreen products to help reduce the long-term effects of UVA exposure while delivering stable, reliable, and long-lasting photoprotection.

Performance Advantages

Professional UVA Filtering Performance
Effectively absorbs ultraviolet radiation in the 290–390 nm range, with a peak absorption at approximately 345 nm, providing strong protection against long-wavelength UVA (UVA I) that penetrates deeply into the dermal layer of the skin.
Outstanding Photostability
Compared with conventional chemical sunscreen agents, Ecamsule features a highly stable molecular structure that is resistant to photodegradation under sunlight exposure, ensuring long-lasting and consistent UV protection.
Safe and Formulation-Friendly
Despite its high UV-filtering efficiency, Ecamsule is characterized by low sensitization and low irritation, making it suitable for a wide range of sunscreen and skincare formulations.

Applications

Ecamsule is widely used in:

Facial and body sunscreen creams and gels
Anti-aging skincare protection formulations
Professional outdoor sunscreen products
Broad-spectrum sunscreen systems, when combined with other UV filters (such as UVB filters), to deliver more comprehensive ultraviolet protection across the full UV range

Product Value & Sensory Experience

Ecamsule enhances the overall UVA protection performance of formulations while maintaining breathability and a comfortable skin feel. It is well suited for modern sunscreen products that emphasize both high-level protection and daily skincare benefits.
Its excellent photostability and formulation compatibility make Ecamsule a frequently used and trusted ingredient in professional sunscreen formulation design.