Sodium dihydrogen phosphate

Sodium Dihydrogen Phosphate is generally categorized into Food Grade, Pharmaceutical Grade, and Industrial Grade. Food grade is widely used as a buffering agent, emulsifier, and quality improver in baked goods and dairy. Pharmaceutical grade serves as an excipient or pH regulator in medications. Industrial grade is primarily utilized for water treatment, metal finishing (phosphating), and as a raw material for detergents.

Buyers must prioritize the Purity (Main Content), which should typically be ≥98% for high-quality applications. Other critical parameters include pH value (usually 4.2–4.6 in a 1% solution), Water Insoluble Matter (<0.1%), and heavy metal limits. For anhydrous forms, the Loss on Drying must be strictly controlled to prevent caking during storage.

For food-related imports, compliance with FCC (Food Chemicals Codex) or E339(i) is essential. If sourcing for the EU, ensure the supplier adheres to REACH regulations. For global shipping, a Material Safety Data Sheet (MSDS) and COA (Certificate of Analysis) for every batch are non-negotiable to ensure safety and traceability.

Sodium Dihydrogen Phosphate is available in Anhydrous, Monohydrate, and Dihydrate forms. Anhydrous MSP is preferred for applications where water content must be minimized and offers higher phosphorus concentration per unit weight, potentially reducing shipping costs. However, it is more hygroscopic, requiring superior moisture-proof packaging.

The primary risk is moisture absorption (caking) during long-transit sea freight. Buyers should insist on double-layer packaging (PE inner bag + PP woven bag) or palletized shrink-wrapping. Additionally, ensure the supplier provides a 'Certification for Safe Transport of Chemical Goods' to avoid customs delays or rejections at the port.

Utilize Secured Trading Services provided by reputable platforms like Made-in-China.com to protect payments until the goods are dispatched. It is highly recommended to appoint a third-party inspection agency (like SGS or BV) to conduct a Pre-Shipment Inspection (PSI) to verify the chemical composition and quantity before the final balance is paid.

Chemical prices are often tied to raw material costs (Phosphorus rock/Phosphoric acid). Negotiate based on formula-based pricing or lock in rates for annual volume contracts to mitigate market volatility. Always request tiered pricing (e.g., 5 tons vs. 20 tons) to identify the most economical shipping break-point, such as a Full Container Load (FCL).

Buyers must check their local Customs Tariff Codes (HS Code 283522) and verify if there are any anti-dumping duties or specific import licenses required for phosphate salts. Ensure all labels are translated into the destination language and include GHS (Globally Harmonized System) pictograms if required by local law.