Viscosity: Not available. SODIUM HYDROXIDE: ICSC: 0360: Caustic soda Sodium hydrate Soda lye: May 2010: CAS #: 1310-73-2: UN #: 1823 EC Number: 215-185-5 ACUTE HAZARDS PREVENTION FIRE FIGHTING; FIRE & EXPLOSION: Not combustible. Sodium hydroxide in contact with acids and organic halogen compounds, especially trichloroethylene, may causes violent reactions. Sodium Hydroxide 5% - 50% in aqueous solution Page 1 Issued: 23/03/2012 ... Melting point: 12 °C Solidification point: No data available Boiling point: 143 °C Flash point: No data available Relate vapour. Melting Point:-4C (25F) (5% solution) Vapor Density (Air=1): No information found. Boiling Point: 1390 deg C @ 760 mmHg Freezing/Melting Point:318 deg C Decomposition Temperature:Not available. Water (7732-18-5) LD50 oral rat ≥ 90000 mg/kg Chemsrc provides Sodium hydroxide(CAS#:8012-01-9) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. Contact with moisture or water may generate sufficient heat to ignite combustible materials. Safety Data Sheet according to 29CFR1910/1200 and GHS Rev. Evaporation Rate:Not available. The melting point is specific for a given substance. A volumetric standard solution, titrated at 25°C to pH 8.6 (phenolphthalein endpoint) against NIST™ potassium acid phthalate. The pH of a 0.05% w/w soln ~12, of a 0.5% soln ~13, of a 5% soln ~14. pH: 14 (5% aq soln) Vapor Pressure: 1 mm Hg @739 deg C Vapor Density: Not available. Volumetric NaOH solns used in the laboratory must be protected from air to avoid formation of carbonate. Solubility: Soluble. The melting point depends on the pressure. Concentrated NaOH solns dissolve practically no sodium carbonate. It is also a temperature at which a solid (crystal) turns into a liquid. This product(s) resides on a Fisher Scientific GSA or VA contract. Generates considerable heat while dissolving, or when the soln is mixed with an acid. Articles of Sodium hydroxide are included as well. Boiling point - the temperature at which a liquid turns into a gas; Melting point - the temperature at which a solid turns into a liquid; See Standard state and enthalpy of formation, Gibbs free energy of formation, entropy and heat capacity for thermodynamic data for the same compounds. We say that such a body melts. The melting point is the highest temperature at which crystallization may occur. Sodium Hydroxide, 5% w/v LD50 dermal rabbit 28421 mg/kg ATE US (dermal) 28421 mg/kg body weight . 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