Thanks to their compact structure, SMD LED chips and components are more vulnerable to external factors such as moisture and oxygen, leading to moisture damage, oxidation and failure. The sealing and protective performance of encapsulants has become critical. A high-refractive-index phenyl-based LED encapsulant features low moisture permeability and high oxygen barrier properties, paired with excellent optical and mechanical properties, creating a full-protection barrier for SMD LEDs. It ensures high luminous efficiency while maintaining long-term stable operation of the light source. Low moisture permeability and high oxygen barrier are its core advantages. With a water vapor transmission rate of 5.70g/m²·24h, the compound allows extremely little moisture to pass through per unit area per day, effectively blocking external moisture from entering the package and preventing short circuits and light attenuation caused by damp chips and circuits. It keeps internal components dry even in humid southern regions or outdoor rainy environments. An oxygen transmission rate of 270cm³/m²·24h greatly reduces oxygen penetration, preventing oxidation and rusting of internal metal brackets and solder joints, extending the service life of SMD LEDs and solving the industry pain point of protecting miniaturized light sources. More impressively, it delivers strong protection without compromising optical performance. Designed specifically for SMD LEDs, its 1.54 high refractive index reduces light refraction loss, and a 92% high light transmittance guarantees brightness, keeping luminous efficiency outstanding even with full sealing protection. A low coefficient of linear thermal expansion of 170ppm means the compound barely expands or contracts with temperature changes, avoiding cracking caused by environmental temperature differences or slight heat generation by the light source, perfectly adapting to various application scenarios of SMD LEDs. It also offers excellent processability and production compatibility. The 1:5 mixing ratio is simple and easy to operate; the mixed viscosity of 6000mPa·s is precisely tailored for precision SMD LED packaging, preventing glue overflow or insufficient filling. Curing conditions of 100℃/1h + 150℃/3h align with industrial production lines. From household SMD downlights and LED makeup mirrors, to commercial SMD soft film lights and outdoor SMD garden lights, and even SMD backlight LEDs for consumer electronics — this encapsulant provides all-round protection, keeping SMD LEDs glowing steadily in all scenarios.