Leonardite powder price manufacturers

When sourcing Leonardite Powder, the primary quality metric is the Humic Acid content, which should ideally be above 50-70% on a dry basis. Additionally, check the Fulvic Acid content (typically 5-15%) and the solubility rate if you require water-soluble products for fertigation. Ensure the pH value is within the range of 3.0 to 5.0 for raw leonardite, or adjusted if it is a potassium humate derivative.

Buyers must verify the particle size (mesh count); for soil application, a coarser powder is acceptable, but for liquid formulations, a 325 mesh or finer is required to prevent clogging. You should also request a heavy metal analysis report to ensure levels of Lead, Arsenic, and Cadmium are well below the international safety limits for organic fertilizers.

To ensure compliance with organic farming standards, look for suppliers with OMRI (Organic Materials Review Institute) listing or REACH certification for the EU market. ISO 9001:2015 is essential for consistent manufacturing quality, and a Certificate of Analysis (COA) should be provided for every batch to guarantee the chemical composition.

Leonardite is a naturally occurring mineral; its quality depends on the oxidation level of the lignite source. High-grade Leonardite from specific mineral veins offers higher cation exchange capacity (CEC). Prices fluctuate based on the purity of the raw ore and the processing depth (e.g., raw crushed ore vs. chemically extracted potassium humate).

The biggest risk is adulteration with low-grade coal dust or lignite, which looks similar but lacks biological activity. Always use Made-in-China.com's 'Audited Supplier' status to verify the factory's existence. Request a pre-shipment inspection (PSI) by third parties like SGS or Intertek to verify the Humic Acid percentage before final payment.

Negotiate based on Total Organic Matter (TOM) rather than just weight. Suppliers often offer 10-20% discounts for full container loads (FCL). Discuss Incoterms clearly; for heavy mineral products like Leonardite, FOB (Free On Board) is often more cost-effective if you have a reliable freight forwarder who can handle heavy-weight shipping surcharges.

Leonardite is a fine powder and can be prone to moisture absorption. Ensure the supplier uses moisture-proof PP/PE bags (25kg or 50kg) with an inner plastic liner. For bulk shipments, Jumbo Bags (1000kg) are more economical. Ensure the Material Safety Data Sheet (MSDS) is provided to the carrier, as it is classified as a non-hazardous chemical but requires proper handling to avoid dust explosions.

Utilize Secured Trading Services provided by Made-in-China.com to protect your payment until the goods are shipped. Avoid direct wire transfers to private accounts. Establish a milestone-based payment structure (e.g., 30% deposit, 70% against the Bill of Lading) to mitigate financial risk.