Magnesium trisilicate

Magnesium trisilicate (CAS 14987-04-3) is an inorganic salt of magnesium and silicon, commercially available under trade names including Trimax, Silimag, Magnosil, and Dicarbocalm. It carries no assigned E-number and is categorised within the salts and minerals class.

In pharmaceutical manufacturing, magnesium trisilicate functions as an antacid and tablet excipient, neutralising gastric acid through direct ion exchange with protons. In polymer processing, it acts as a heat stabiliser and crosslinking agent, improving thermal resistance in PVC and rubber compounds. It also serves as a catalyst support and adsorbent in refining and food-grade decolourisation processes.

Magnesium trisilicate is supplied as a fine white powder in pharmaceutical-grade (Ph.Eur., USP/NF) and food-grade (FCC) specifications. The substance is registered under REACH and available in 25 kg bags or bulk quantities. Buyers should confirm grade suitability against their specific regulatory and formulation requirements.