Which grade for which step?
Each row lists the first grade we suggest for a trial, the values that matter on its technical data sheet, and an alternative.
| Process step | What the additive does | First choice | Key TDS values | Alternative |
|---|---|---|---|---|
| Unpaved and gravel roads | Binds surface fines and keeps them in place under traffic | Calcium lignosulfonate dust control liquid | Solids 45–55%; lignosulfonate 45% min (liquid basis); pH 4.0–7.0; density approx. 1.20–1.28 g/cm³ | Sodium lignosulfonate dust control liquid (solids 45% min, Brix 50% min) |
| Mine haul roads | Same job under heavier traffic and longer intervals between treatments | Calcium or sodium dust control liquid | As above; confirm solids and lignosulfonate content on the COA of each lot | Calcium lignosulfonate dust control powder dissolved on site where freight to the mine is costly |
| Construction access roads and yards | Short-term dust reduction on temporary surfaces | Calcium lignosulfonate dust control grade (powder) | Dry matter 95% min; lignosulfonate 55% min; water-insoluble matter 1.0% max | Sodium lignosulfonate dust control powder |
| Asphalt and bitumen emulsion | Supports emulsification and emulsion stability | Sodium lignosulfonate emulsifier grade | Dry matter 95% min; lignosulfonate 70% min (dry basis); water-insoluble matter 0.5% max | Calcium lignosulfonate emulsifier grade (total solids 95% min, pH 4–9) |
Values are from the current TDS of each grade. Batch results are stated on the COA supplied with each shipment.
How to choose between grades
Liquid or powder?
Liquid dust control grades (45–55% solids) go straight into a water truck after dilution. Powders (95% dry matter) cut freight roughly in half for the same active amount but must be dissolved first. Choose by distance to site and the equipment available.
Calcium, sodium or ammonium?
Calcium liquids are the usual choice for roads. Sodium grades suit sites where added calcium is unwanted. An ammonium lignosulfonate dust control powder is also available (lignosulfonate 50% min, total nitrogen 3–5%); check whether added nitrogen is acceptable for run-off on your site.
Why compare the COA, not only the TDS?
Dust control performance follows the solids and lignosulfonate content actually delivered. Ask for the COA of each lot and dilute to the same active content when you compare suppliers.
What to send us for a grade recommendation
- Road type and traffic (vehicles per day, vehicle weight)
- Surface material and fines content
- Climate: rainfall and dry-season length
- Spray equipment (water truck, distributor) and tank sizes
- Target interval between treatments
- Volume per season and packing (IBC, flexitank, bags)
Related application guides
Frequently asked questions
Which lignosulfonate is best for unpaved road dust control?
A calcium lignosulfonate dust control liquid is the usual first choice (solids 45–55%, lignosulfonate 45% min on liquid basis). Sodium dust control liquid is the alternative where calcium is not wanted.
Is lignosulfonate washed off by rain?
It is water-soluble, so heavy rain can reduce the treated layer and re-application may be needed. Plan the treatment interval with your local rainfall.
Liquid or powder for a remote site?
Powder carries 95% dry matter against 45–55% solids for liquids, so it lowers freight for the same active amount. You need a tank and mixer to dissolve it before spraying.
How much do I apply?
Set the rate by a trial section on your own road. It depends on surface material, traffic and climate, so we do not publish one fixed rate.
Ask for TDS, SDS and a grade recommendation
Send your process details and we will reply with the grades to trial and their documents.
Last reviewed 27 October 2026. Specifications from Green Agrochem technical data sheets.