Calcium hydroxide

Buyers must prioritize purity levels (Ca(OH)2 content), typically ranging from 90% to 98% depending on the application. For water treatment or chemical synthesis, a higher purity is essential. Additionally, pay close attention to fineness (mesh size); industrial grades usually require 325 mesh or finer to ensure rapid reactivity. Other critical parameters include moisture content (<1%) and the concentration of impurities like Magnesium Oxide (MgO) and Acid Insolubles, which should be kept to a minimum to prevent equipment scaling or chemical interference.

For food-grade applications, ensure the supplier meets FCC (Food Chemicals Codex) or E526 standards. For industrial and construction use, compliance with ASTM C25 or EN 459 is standard. Crucially, as a chemical product, the supplier must provide a comprehensive SDS (Safety Data Sheet) compliant with the GHS (Globally Harmonized System). If exporting to the EU, verify REACH registration status to avoid customs delays.

The choice depends heavily on the end-use: Environmental Protection (Flue Gas Desulfurization & Water Treatment) requires high reactivity and specific surface area; Construction (Mortar & Plaster) focuses on plasticity and water retention; and Chemical Manufacturing demands ultra-high purity to act as a pH stabilizer or reagent. Always request a Certificate of Analysis (COA) from the supplier that matches your specific application requirements.

Calcium Hydroxide is classified as a corrosive and irritating substance. It is vital to ensure moisture-proof packaging, typically using PP woven bags with a PE inner liner or Jumbo bags (FIBC) to prevent carbonation (reaction with CO2) and clumping. During transit, it must be kept away from acids and flammable materials. Ensure the carrier is experienced in handling Class 8 or non-hazardous chemical powders (depending on local regulations) to prevent leakage and environmental contamination.

To secure the best value, leverage volume-based pricing; discounts of 10-20% are common for full container loads (FCL). Use Trade Assurance or Escrow services provided by the platform to protect your payment until the goods are verified. It is highly recommended to hire a third-party inspection agency (like SGS or Intertek) to conduct a Pre-Shipment Inspection (PSI) to verify the purity and weight before the final balance is paid.

Due to its weight-to-value ratio, Sea Freight is the most economical method. Buyers should clarify Incoterms; FOB (Free On Board) is preferred for buyers with their own freight forwarders to control costs, while CIF (Cost, Insurance, and Freight) is simpler for new buyers. Ensure the HS Code (typically 2522.20.00) is correctly declared to determine accurate tariff rates and check for any anti-dumping duties applicable to chemical exports in your specific country.