Polypropylene[3]

Updated: 2026-09-11

Overview

Sodium hydroxide (NaOH), commonly known as caustic soda or lye, is a fundamental inorganic compound in industrial chemistry. It is a white, odorless solid at room temperature and is highly soluble in water, producing a strongly alkaline solution. Sodium hydroxide is produced industrially via the chloralkali process, which involves the electrolysis of sodium chloride (salt) solution. Due to its strong alkaline nature, sodium hydroxide is used in a wide range of applications, from chemical synthesis to water treatment. Its versatility and reactivity make it a critical component in many manufacturing processes.

Physical and Chemical Properties

Sodium hydroxide is characterized by its high solubility in water, releasing significant heat upon dissolution. It forms a highly caustic solution with a pH typically above 12, making it one of the strongest bases. The compound is hygroscopic, meaning it readily absorbs moisture from the air, which can lead to caking if not stored properly. In its solid form, sodium hydroxide is typically available as pellets, flakes, or granules. It reacts violently with acids, producing heat and water. Its melting point is 318°C (604°F), and it decomposes at high temperatures, releasing toxic fumes of sodium oxide.

Main Applications

Sodium hydroxide is indispensable in the chemical industry, where it is used in the production of soaps, detergents, and various organic compounds. In the paper and pulp industry, it is employed in the Kraft process to break down wood fibers. Water treatment facilities use sodium hydroxide to adjust pH levels and remove heavy metals. The food industry utilizes sodium hydroxide for processes such as olive curing and pretzel baking. Additionally, it plays a role in biodiesel production and aluminum ore processing. Its versatility underscores its importance across multiple sectors.

Safety and Storage

Handling sodium hydroxide requires strict safety measures due to its corrosive nature. Direct contact with skin or eyes can cause severe burns, and inhalation of dust or mist may lead to respiratory irritation. Proper personal protective equipment (PPE), including gloves, goggles, and respirators, is essential. Storage should be in a cool, dry, well-ventilated area, away from incompatible substances like acids and organic materials. Containers must be tightly sealed to prevent moisture absorption. Spills should be neutralized with a weak acid, such as vinegar, and cleaned up immediately.

B2B Procurement Guide

When procuring sodium hydroxide, B2B buyers should prioritize suppliers who adhere to international safety and quality standards, such as ISO certifications. Purity levels (typically 98-99%) should be verified to ensure suitability for specific applications. Bulk purchases often offer cost advantages, but storage capacity must be considered. Transportation requires hazardous material handling, and buyers should confirm compliance with local regulations. Long-term contracts with reliable suppliers can stabilize pricing and ensure consistent supply. Additionally, buyers should assess the supplier’s technical support and emergency response capabilities.