WFI water stands for Water for Injection, which represents the highest, most rigorously purified grade of water used extensively within the pharmaceutical and medical industries. It is completely sterile, chemically pure, and free from active microorganisms, mineral ions, organic residues, and bacterial endotoxins. Because it undergoes advanced multi-stage distillation or specialized reverse osmosis processes, it serves as the essential baseline solvent and vehicle for manufacturing parenteral drugs, biological products, and medications destined for direct intravenous, subcutaneous, or intramuscular injection.
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