Caustic soda sodium hydroxide

Buyers must distinguish between Caustic Soda Flakes, Pearls, and Lye (Liquid). The most common industrial grade is 99% purity (min) for solids and 32% or 50% concentration for liquids. Key impurities to monitor include Sodium Carbonate (Na2CO3), Sodium Chloride (NaCl), and Iron (Fe), as high iron content can discolor final products in the textile or soap industries.

As a highly corrosive substance, it must have a valid Material Safety Data Sheet (MSDS). For food-grade applications, FCC (Food Chemicals Codex) or ISO 22000 is required. For industrial use, ensure the supplier complies with ISO 9001 for quality management and REACH registration if exporting to the European Union.

Caustic soda is highly hygroscopic (absorbs moisture from the air). Standard packaging involves 25kg PP/PE woven bags with a thick PE inner liner. For bulk shipments, 1-ton jumbo bags are used. Ensure the packaging is UN-certified (UN1823 for solids) to meet international maritime dangerous goods (IMDG) regulations.

It is a fundamental chemical used in water treatment (pH adjustment), soap and detergent manufacturing (saponification), textiles (mercerizing fibers), and pulp and paper (bleaching). Understanding the specific application helps in choosing between diaphragm process and membrane process caustic soda, the latter being of higher purity and preferred for high-end manufacturing.

Caustic Soda is classified as Class 8 Dangerous Goods. You must ensure the freight forwarder is licensed to handle hazardous materials. Improper stowage near acids or flammable materials can lead to severe chemical reactions. Always verify that the Dangerous Goods (DG) Declaration is accurately filed to avoid port seizures or heavy fines.

Utilize Made-in-China.com's secured payment services to ensure funds are only released upon proof of shipment. For large chemical orders, it is highly recommended to hire a third-party inspector (like SGS or BV) to perform a Pre-Shipment Inspection (PSI) to verify the purity and weight at the loading port.

Chemical prices are volatile and tied to energy costs (electricity) and salt raw material prices. Negotiate based on formula-based pricing for long-term contracts or seek volume-based discounts for orders exceeding 100 metric tons. Be wary of prices significantly below the market index, as this often indicates sub-standard purity or adulteration with salt.

Check your local import tariffs and whether there are anti-dumping duties on Sodium Hydroxide from specific regions. Ensure the supplier provides a Certificate of Origin (CO) to benefit from Free Trade Agreements (FTA) where applicable. In many countries, an import permit for precursor chemicals may be required.