Lignosulfonates are registered under separate CAS numbers for each salt. This page lists the CAS numbers and compares the typical properties of our main grades, taken from their technical data sheets.
CAS Numbers
| Substance | CAS No. |
|---|---|
| Sodium lignosulfonate | 8061-51-6 |
| Calcium lignosulfonate | 8061-52-7 |
| Ammonium lignosulfonate | 8061-53-8 |
| Magnesium lignosulfonate | 8061-54-9 |
Because lignosulfonates are variable natural polymers, the CAS number identifies the salt type, not an exact molecule. Grades with the same CAS number can differ in purity, sugar and molecular weight.
Typical Properties by Grade
| Property | Sodium LS (GAC-NaLS-1) | Calcium LS (GAC-CaLS-1) | Ammonium LS (GAC-NHLS-DC) |
|---|---|---|---|
| Appearance | Yellow-brown powder | Light yellow-brown powder | Yellow-brown to brown powder |
| Lignosulfonate content | 55% min (dry basis) | 55% min (dry basis) | 50% min |
| Dry matter | 95% min | 95% min | 95% min |
| Moisture | 5% max | 5% max | 5% max |
| Water-insoluble matter | 1.5% max | 1.5% max | 1.0% max |
| pH | 7.0–9.5 (10% solution) | — | 4.0–7.0 (1% solution) |
| Reducing sugar | 7% max | About 7% | About 7% |
| Other | Ca + Mg 0.5% max | Ca + Mg 5–8%; ash 12% max | Total nitrogen 3–5% |
General Properties
- Brown, odourless, amorphous powder; liquids are dark brown.
- Soluble in water at any pH; practically insoluble in organic solvents.
- Anionic; adsorbs on particle surfaces and disperses them.
Overview of uses: what is lignosulfonate.
How to Read a Lignosulfonate COA
- Lignosulfonate content: the active material; compare on the same (dry) basis.
- Reducing sugar: important for concrete setting time.
- Ca + Mg: low values (0.5% max for sodium Grade One) are needed in sulfate- or phosphate-rich systems.
- Water-insoluble matter: fibres and impurities that can block nozzles or filters.
- Moisture: affects flow and storage of powders.
Product pages and documents: sodium lignosulfonate.
Frequently Asked Questions
What is the CAS number of sodium lignosulfonate?
8061-51-6. Calcium lignosulfonate is 8061-52-7, ammonium lignosulfonate 8061-53-8 and magnesium lignosulfonate 8061-54-9.
Do all lignosulfonates with the same CAS number perform the same?
No. The CAS number identifies the salt type. Grades differ in lignosulfonate content, sugar, Ca + Mg and insoluble matter, so compare TDS and COA values.
