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. A405 (aqueous solution, against water): ≤ 0.010. Identity (NIR): Corresponds to reference. C (elementary analysis): 53.5-54.6%. 2-Hydroxypyridine-n-oxide (from C): 99-101%. Water (K. Fischer): ≤ 0.5%. Heavy metals (as lead): ≤10 ppm. Fe (AAS): ≤10 ppm. AI (AAS): ≤10 ppm. Isopropanol (GC): ≤ 0.2%. Stability: At + 2 to + 8°C within specification range for 36 months. Protect form light.