SNF stands for sodium naphthalene formaldehyde, short for sodium naphthalene sulfonate formaldehyde condensate. In construction it is a chemical admixture: a high-range water reducer (superplasticizer) and cement dispersant supplied as a brown powder.
SNF is used in construction as a cement dispersant and high-range water-reducing component, but each use case requires its own concrete qualification. This page organizes construction applications and decision criteria; grades and quotations are on the LigninCorp SNF product page.
The useful question is not simply whether a formulation contains SNF. Buyers should define the required workability, retention time, setting window, stability and hardened properties, then confirm that the selected SNF grade works with the actual cementitious system.
Precast Concrete
Evaluate early strength, finishing, steam-curing response, dimensional stability and mold-release cycle. Faster demolding is a trial result, not an automatic SNF property.
Ready-Mix and Pumped Concrete
Check workability at batching, arrival and placement; include temperature and haul time. Pumpability also depends on paste volume, aggregate grading, line configuration and operator practice.
Prestressed Concrete
Review chloride contribution, early strength, setting and curing procedure against the governing specification. Product selection must be approved by the concrete producer and engineer.
Grouts and Cementitious Products
Measure flow, segregation, bleeding, dimensional change and strength with the actual binder and filler system. Dry-mix formulations also require storage and redispersion checks.
Mortars and Dry-Mix Formulations
In a factory-made dry mix, powder flow, dissolution and compatibility with cellulose ethers, defoamers, retarders and other additives can be as important as cement dispersion. Evaluate water demand, wet density, open time, adhesion where relevant and package-storage stability using the complete formulation.
Selection Checklist
- Required standard and exposure class.
- Cement, SCM and aggregate sources.
- Target water-binder ratio and workability window.
- Air, setting and strength requirements.
- Compatibility with the complete admixture package.
- Plant dosing, storage, packaging and quality-control capability.
Recommended Validation
Use the supplier range as a recommended starting point, then run laboratory, production and—where relevant—full-scale pumping trials. Do not claim guaranteed water reduction, strength, cement savings or durability without project data.
For troubleshooting, first hold the mixing procedure and water content constant. Compare initial and retained workability, air, setting, bleeding and segregation, then cast strength specimens from representative production concrete. Read the SNF cement compatibility guide before transferring a dosage from one cement source to another.
Industrial Product Route
For current specifications, samples and quotations, visit LigninCorp Sodium Naphthalene Formaldehyde.
SNF Grades and Data Sheet Values
Our current SNF grades differ mainly in sodium sulfate content:
| Grade | Sodium sulfate (Na2SO4) | Chloride (Cl–) | Cement paste fluidity | Solids | pH |
|---|---|---|---|---|---|
| SNF-5 (GAC-SNF-5) | 5% max | 0.4% max | 220 mm min | 91% min | 7 – 9 |
| SNF-10 (GAC-SNF-10) | 10% max | 0.4% max | 220 mm min | 91% min | 7 – 9 |
| SNF-18 (GAC-SNF-18) | 18% max | 0.5% max | 210 mm min | 91% min | 7 – 9 |
| SNF-20 (GAC-SNF-20) | 20% max | 0.5% max | 210 mm min | 91% min | 7 – 9 |
| Powder Grade, high solids (GAC-SNF-P) | 10% max | Below 200 ppm | Not listed | 95% min | 6.5 – 8.5 (1:10) |
The current TDS gives a supplier-recommended starting trial range of 0.5–1.0% powder by weight of cementitious material, with 0.75% as the first trial point. Confirm the working dose by trial mixes with your own cement, aggregates and admixtures.
Concrete test data, packaging and TDS downloads are on the SNF product page.
Frequently Asked Questions
What is SNF chemical?
Sodium naphthalene sulfonate formaldehyde condensate, a brown water-soluble powder used as a concrete superplasticizer and dispersant.
What is the full form of SNF in construction?
Sodium naphthalene formaldehyde (sodium naphthalene sulfonate formaldehyde condensate).
Where is SNF used in construction?
In ready-mix and precast concrete, grouts, dry-mix mortars and gypsum products, as a water reducer and dispersant.
How much SNF is used in concrete?
The TDS starting trial range is 0.5–1.0% by weight of cementitious material, with 0.75% as the first trial.
