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For further processing only. Others MES free acid MES, free acid 3.2.15.1.4.3 crystalline powder 4432-31-9 en Buffer for a variety of diagnostic tests, such as glucose test. en Use MES as a buffer in reagents that require a pH of approximately 6. en Appearance: White, crystalline powder Solubility: Clear, colorless solution in water (20 mg/mL) Identity (NIR): Corresponds to reference PVS/IgI screening: ≤1 ppm MES (alkalimetric, based on dry weight): ≥98.0% Water (K. Fischer): ≤10.0% Na (flame photometric): ≤20 ppm Stability: At +15 to +25°C within specification range for 24 months. en