A Sodium Lignosulfonate Certificate of Analysis (COA) is the batch-specific quality release record supplied with a shipment. It should identify the product grade, batch number, production date, test methods, specification limits and measured results. A website example is useful for explaining the format, but it is not a substitute for the signed COA issued for the purchased batch.
Grade One Powder: Typical COA Fields
| Parameter | Reference specification |
|---|---|
| Appearance | Yellow-brown powder |
| pH (10% solution) | 7.0–9.5 |
| Dry matter | 95% minimum |
| Water-insoluble matter | 1.5% maximum |
| Water-reducing capacity | 8% minimum |
| Sulfate | 2–5% |
| Calcium and magnesium | 0.5% maximum |
| Lignosulfonate content | 55% minimum |
| Reducing sugar | 7% maximum |
| Moisture | 7% maximum |
Actual results change by batch and grade. Confirm that the product code and agreed specification on the COA match the purchase contract.
Packaging and Storage
Typical packing is 20 or 25 kg lined woven bags, with jumbo bags available by agreement. Store dry and ventilated, protect from moisture and follow the SDS. The stated shelf life is 24 months under recommended conditions.
See the Sodium Lignosulfonate product page and liquid-grade COA guide. Request the official shipment COA from info@greenagrochem.com.
