When sourcing Sodium Fluoride, the purity level (typically 98% or 99% min) is the primary price driver. For industrial use, such as water treatment or metallurgy, technical grade is sufficient. However, for toothpaste or pharmaceutical applications, you must ensure the product meets USP or BP pharmacopoeia standards. Always request a Certificate of Analysis (COA) for every batch to verify the Fluoride content and check for heavy metal impurities (like Lead or Arsenic) which must be within strict safety limits.