-pH 4: not stable at 50°C, half-life~149 hours at 25°C -pH 9: not stable at 50°C, half-life~180 days at 25°C Adsorption / Desorption: Not determined Dissociation Constant pKa: -SO3- -2.5>pKa>-3.0 (acidic) Naphthol-NH-triazine pKa ~0.8 (basic) Triazine-NH-CH2- pKa<2 (basic) OH in alpha-Naphthol pKa>11 (basic) Flash Point: Not relevant Flammability Limits: Not highly flammable (flame would not spread) Autoignition Temperature: No ignition trial 400°C Explosive Properties: Not explosive Reactivity / Stability: No thermal effect below 150°C Not an oxidiser Surface Tension: 60.5 mN/m at 1 g/L 67.9 mN/m at 10 g/L Not a surfactant Particle size distribution: <40 µm 1% >63 µm 96% >100 µm 83% >200 µm 31% >315 µm 14% >400 µm 8% >800 µm <1% Comments on physico-chemical properties: The study (OECD TG 112) of the assessment of the pKa's of the functional groups of the notified chemical indicated that the important pKa's are the strongly acidic -SO3- groups which will render the molecule sixfold negatively charged over the whole environmentally relevant pH region. The possible protonation of the weakly basic amino groups and ionisation of the weakly acidic -OH group will only have a very small effect in the unimportant pH regions below 3 and above 11.
-pH 4: not stable at 50°C, half-life~149 hours at 25°C -pH 9: not stable at 50°C, half-life~180 days at 25°C Adsorption / Desorption: Not determined Dissociation Constant pKa: -SO3- -2.5>pKa>-3.0 (acidic) Naphthol-NH-triazine pKa ~0.8 (basic) Triazine-NH-CH2- pKa<2 (basic) OH in alpha-Naphthol pKa>11 (basic) Flash Point: Not relevant Flammability Limits: Not highly flammable (flame would not spread) Autoignition Temperature: No ignition 400°C Explosive Properties: Not explosive Reactivity / Stability: No thermal effect below 150°C Not an oxidiser Surface Tension: 60.5 mN/m at 1 g/L 67.9 mN/m at 10 g/L Not a surfactant Particle size distribution: <40 µm 1% >63 µm 96% >100 µm 83% >200 µm 31% >315 µm 14% >400 µm 8% >800 µm <1% Comments on physico-chemical properties: The study (OECD TG 112) of the assessment of the pKa's of the functional groups of the notified chemical indicated that the important pKa's are the strongly acidic -SO3- groups which will render the molecule sixfold negatively charged over the whole environmentally relevant pH region. The possible protonation of the weakly basic amino groups and ionisation of the weakly acidic -OH group will only have a very small effect in the unimportant pH regions below 3 and above 11. trial
NA305FR.docx