This 125mL bottle of ASTM Type I Ultrapure Water meets the strictest purity standards defined by the American Society for Testing and Materials. Designed for ultra-sensitive laboratory applications including gas chromatography, HPLC, mass spectrometry, atomic absorption spectroscopy, and trace analysis. Type I water has the highest purity grade, with minimal ionic, organic, and particulate contamination. Essential for analytical procedures where even trace contaminants can affect results. Suitable for research laboratories and quality control settings.