Sodium lignosulphonate

Sodium Lignosulphonate is a versatile anionic surfactant primarily used as a water-reducing agent (plasticizer) in concrete to improve workability and strength. It also serves as a dispersant in textile dyes, a binder in animal feed pellets and ceramic manufacturing, and a stabilizer in oil drilling muds. Its ability to reduce surface tension makes it essential for emulsification and suspension in pesticide formulations.

Buyers must evaluate the pH value (typically 7.0-9.5), dry matter content (≥90-95%), and water-insoluble matter (≤0.5-1.5%). For concrete applications, the reducing sugar content is critical; lower levels (typically <4%) are preferred to prevent excessive retardation of setting time. Additionally, verify the lignin content and moisture levels to ensure high purity and cost-effectiveness.

For construction use, ensure the product meets ASTM C494 (Type A) standards for chemical admixtures. If used in animal feed, it must comply with FAMI-QS or local FDA/EFSA regulations. For general chemical safety, a comprehensive Material Safety Data Sheet (MSDS) and REACH registration (for EU markets) are mandatory to ensure the product is non-toxic and environmentally manageable.

Request a lab-scale performance test report. For concrete, perform a slump flow test to measure water reduction efficiency (typically 8-12% reduction). For binders, test the compressive strength of the resulting pellets. Ensure the powder is free-flowing and uniform in color (usually yellow-brown to dark brown), as clumping indicates high moisture absorption or poor storage.

The most significant risk is moisture absorption (hygroscopicity) during sea transit, which can lead to caking. Ensure the supplier uses moisture-proof double-layer packaging (PP woven bags with PE inner liners). Another risk is batch inconsistency; always demand a Certificate of Analysis (COA) for every shipment to ensure the chemical composition matches the approved sample.

Negotiate based on purity levels and volume tiers. For orders exceeding 20 metric tons (one 20ft container), aim for a 10-15% discount. Discuss payment security by using Letter of Credit (L/C) or Trade Terms on Made-in-China.com to protect your funds until the Bill of Lading is issued. Also, clarify the lead time, which should ideally be within 7-14 days for standard industrial grades.

Sodium Lignosulphonate is generally classified as non-hazardous for transport, but it is vital to confirm this with a DGM report to avoid customs delays. Use FOB (Free On Board) terms if you have a reliable freight forwarder to control costs, or CIF (Cost, Insurance, and Freight) for a more convenient 'to-port' delivery. Ensure the container is inspected for leaks before loading to prevent contamination.

Utilize Made-in-China.com to identify Audited Suppliers who have undergone on-site inspections. Look for manufacturers with ISO 9001:2015 certification and high transaction levels, which indicate stability and experience in handling large-scale chemical exports.