Overview
Sodium Hydroxide (NaOH), marketed as bleaching and degreasing flake, is a foundational industrial chemical with high alkalinity. It is produced through electrolysis of sodium chloride solutions and is widely used for its ability to break down organic materials and emulsify fats. In B2B contexts, flake NaOH is preferred for its ease of handling and storage compared to liquid caustic soda. Industries such as textiles, food processing, and metal treatment rely on it for efficiency in cleaning and surface preparation processes.
Physical and Chemical Properties
The compound appears as white, odorless flakes or pellets with a crystalline structure. It is highly hygroscopic, absorbing moisture and carbon dioxide from air, which necessitates airtight storage. NaOH dissolves exothermically in water, releasing heat and forming a strongly alkaline solution (pH ~14). Its reactivity with acids, metals (e.g., aluminum), and organic compounds makes it effective for degreasing but requires careful handling to avoid hazardous reactions.
Main Applications
In textile manufacturing, NaOH is used to bleach fabrics and remove impurities. Its strong saponification action converts fats into soap, making it essential for detergent production. The metal industry employs NaOH solutions to degrease machinery parts and strip coatings. In food processing, it assists in peeling fruits/vegetables and neutralizing acidic byproducts, though food-grade purity standards must be met.
Safety and Storage
NaOH is corrosive to skin, eyes, and respiratory tissues. Spills must be neutralized with weak acids (e.g., vinegar) and rinsed with water. Always use chemical-resistant PPE and ensure ventilation in workspaces. Store flakes in polyethylene or steel drums with moisture-proof seals. Avoid proximity to acids or reactive metals to prevent explosive hydrogen gas formation. Shelf life is indefinite if kept dry.
B2B Procurement Guide
Buyers should prioritize suppliers with certifications like ISO 9001 and REACH compliance. Key specifications include purity (≥98%), low chloride content (<0.1%), and minimal iron contamination. Bulk purchases (25kg bags or 1-ton pallets) typically offer cost savings. Verify packaging for leaks or discoloration, which indicate moisture exposure. Regional pricing fluctuates with energy costs due to production via electrolysis.
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