What is E551? Decoding the Identity of Food Grade Silica

In food ingredient lists, "E551" is a frequently seen international standard code, corresponding to food grade silica (SiO₂). As a core anti-caking agent recognized by the Codex Alimentarius Commission (CAC), it is produced via natural mineral processing or synthetic technology with a purity exceeding 99%, serving as a "safety staple" in the food industry.

Food grade silica (E551) complies with multiple international standards: China's GB 25576, EU E551 specification, and US FDA certification, with heavy metal and microbial indicators far below limit values. Unlike industrial-grade silica, it is specifically designed for food applications. By absorbing moisture and forming a loose structure, it prevents caking in powdered foods such as milk powder, condiments, and flavors & fragrances, without affecting taste, texture, or nutritional value—making it a trusted safety additive for food enterprises worldwide.