Technical Specifications

According to manufacturers like Avantor and Spectrum Chemical, the high-purity solid form typically exhibits the following properties: 

• Chemical Formula: NaOH.
• Purity/Assay: 99% to 99.99% depending on the specific grade (Technical, FCC, or ACS).
• Melting Point: Approximately 318°C to 323°C.
• Boiling Point: 1390°C.
• Density: 2.13 g/cm³ at 20°C.
• Solubility: Highly soluble in water, ethanol, and glycerol, but insoluble in acetone. It is deliquescent, meaning it readily absorbs moisture from the air. 

Industrial and Consumer Applications

Caustic soda is a fundamental raw material used across diverse sectors: 

• Chemical Manufacturing: Used to produce sodium salts, detergents, and as a reactive intermediate in organic syntheses.
• Pulp and Paper: Essential for the delignification of wood in the Kraft process.
• Soap and Textiles: Used in the saponification of fats for soap making and as a mercerizing agent for cotton fabrics.
• Water Treatment: Primarily used for pH regulation and neutralizing acidic waste streams.
• Food Industry: Food-grade (FCC) sodium hydroxide is used for chemical peeling of fruits/vegetables and as a thickening agent.
• Cleaning: High-purity flakes are used in heavy-duty drain cleaners to dissolve fats and proteins. 

Safety and Handling

Due to its highly corrosive nature, strict safety protocols are required: 

• Health Hazards: Contact can cause severe chemical burns and permanent tissue damage, particularly to the eyes.
• Protective Equipment: Personnel must wear gloves, protective eyewear, and face masks or respirators to avoid inhaling fumes.
• Storage: Must be stored in cool, dry, and ventilated warehouses in tightly sealed containers to prevent moisture absorption and clatting.