When purchasing Boric Acid, the purity level is the most critical factor. For industrial applications, a purity of 99.5% or higher is standard. You must distinguish between Granular and Powder forms based on your production needs; granular is easier to handle and produces less dust, while powder dissolves faster. Additionally, check the B2O3 (Boric Oxide) content, which should typically be around 56.5%, and ensure heavy metal impurities (like Arsenic or Lead) are within the parts-per-million (ppm) limits required for your specific industry.