Sodium lignosulfonate (CAS 8061‑51‑6) is a high‑purity (≥99 %) water‑soluble polymer derived from wood lignin, with a pH of 6.5‑7.5 and solubility up to 25 °C. It dissolves completely in water, forming a stable, slightly viscous suspension. The polymer chain contains aromatic phenolic units linked to sulfonate groups, which give the molecule strong affinity for mineral surfaces and excellent dispersing power. The sulfonate‑carboxyl functionalities can chelate calcium ions, accelerating cement hydration and refining the pore structure of the hardened paste. In the construction sector, sodium lignosulfonate is used as a concrete admixture: it reduces water absorption, increases compressive strength, limits shrinkage, and prevents cracking, resulting in moisture‑resistant and anti‑crack concrete. When combined with conventional plasticizers based on polycarboxylates, it allows a lower water‑to‑cement ratio while maintaining workability, because the lignosulfonate enhances dispersion of cement particles. Typical dosage ranges from 0.5 % to 2 % of cement weight, depending on the desired performance. Beyond concrete, the additive is employed in mortar mixes to lower porosity of joints and improve bond strength to masonry units. In the pulp‑paper industry it acts as a dispersant, stabilising fibre suspensions, increasing sheet density and improving tensile strength of the finished paper. As a soil conditioner in agriculture, lignosulfonate promotes aggregation of soil particles, improves water retention, and can act as a carrier for micronutrients, thereby supporting crop yield. In dye synthesis it serves as a binding agent, enhancing pigment adhesion to fabrics and stabilising emulsions during processing. Sourcing lignosulfonate from reputable brands such as KCC, Kukdo, Evonik, and BASF ensures a consistent composition, full documentation (TDS, SDS, COA) and predictable behavior during production. For storage, keep the material in a dry, cool environment (5‑25 °C) away from direct sunlight and moisture; the shelf life under proper conditions exceeds 24 months. The product is shipped in sealed bags of 25 kg or 500 kg, facilitating transport and warehousing.
| Purity | ≥99% |
| pH | 6.5–7.5 |
| Moisture Content | ≤10% |
| Temperature | ≤25°C |
25 kg bags
Sodium lignosulfonate must be stored in a dry, well‑ventilated area, away from direct sunlight and heat sources. Recommended storage temperature is between +5 °C and +25 °C; exposure to higher temperatures may accelerate polymer degradation. When packaging remains intact, the product typically retains its properties for 12–24 months. Handling requires protective gloves and eye protection, and dust should not be inhaled. Ensure the container stays tightly sealed; any compromised packaging should be transferred to a new, securely closed container.
