Formula: C5H5NO2. Molecular Weight: 111.10 D. Antimicrobial effect: Broad effect. Possible combination: Can be combined other biozides. Interferences: Production of chelates with heavy metal ions. Toxicity: Harmless in recommended concentrations; not carcinogenic or mutagenic (Ames-test negative). Recommended working concentration: 1.3 mg/ml. pH optimum: 5.0-8.0. Stability: Stable. Appearance: White to beige, crystalline powder. Solubility: Clear, colorless solution in water (c = 1 mg/ml). A405 (c = 1 mg/ml water, against water): ≤ 0.010. dentity (NIR): Corresponds to reference. 2-Hydroxypyridine-N-oxide (from C): 99-101%. I. C (elementary analysis): 53.5-54.6%. . Water (K. Fischer): ≤ 0.5%. Heavy metals (as Pb): ≤10 ppm. Fe (AAS): ≤10 ppm. AI (AAS): ≤10 ppm. Na (AAS): ≤70 ppm. 2-Propanol: ≤ 0.2%. Stability: At + 4 to + 8°C within specification range for 12 months. Protect form light.