Boric acid

Boric acid (CAS 10043-35-3), also known as boracic acid and approved as food preservative E284, is an inorganic boron compound sourced for its buffering and biocidal functions. It acts as a pH buffer, preservative, and fire-suppressing agent depending on the application and concentration. Procurement teams across multiple sectors source it as a cost-effective, multifunctional mineral input.

In glass fiber and fiberglass manufacturing, it lowers melt viscosity and improves tensile strength in the final reinforcement product. Textile and leather processors apply it as a flame retardant finish and mold inhibitor. Wood treatment and building products manufacturers use it to protect timber against fungi, insects, and fire. This is often done in combination with other boron salts to ensure long-term structural integrity and safety.

In personal care and pharmaceutical manufacturing, it functions as a pH buffer and mild preservative in topical formulations and ophthalmic solutions. It is valued for its stability and compatibility with various ingredients. Boric acid is supplied as a white crystalline powder or granules, with granular forms preferred for dust-sensitive handling. Standard commercial grades include technical, USP, BP, and Ph. Eur.

Food-grade material is available to E284 specification for permitted preservation uses. Bulk supply is typically offered in 25 kg bags or big bags, with purity levels commonly at 99.5% or higher for industrial use.