SNF 18% Sodium Sulfate Grade is a standard commercial grade for concrete admixture and cement-dispersion formulations where practical performance, supply consistency and formulation economics must be balanced.
Product identity: Sodium naphthalene sulfonate formaldehyde condensate (SNF/PNS), CAS 36290-04-7, brown to dark-brown powder.
Selection point: This page covers the 18% grade only. It is not a combined specification for 5%, 10% and 18% products; buyers should select one grade and confirm it on the quotation, TDS and COA.
Commercial and Formulation Position
Standard-Grade Option
Designed for buyers whose approved formulation permits the standard sodium sulfate grade and who value cost-performance balance.
Concrete Workability
Supports cement-particle dispersion and can assist workability and water-demand control when validated in the customer’s mix.
Incoming Quality Control
Shipments can be supported by the current TDS, SDS and batch COA for supplier qualification and routine inspection.
Not Interchangeable by Default
Changing between sulfate grades can affect formulation behaviour. Requalification is recommended whenever the grade or raw-material source changes.
Grade-Specific Specification Control
| Control item | Procurement requirement |
|---|---|
| Sodium sulfate grade | 18% maximum, subject to the current agreed TDS |
| Physical form | Brown to dark-brown powder |
| Supporting documents | Current TDS, SDS/MSDS and representative or batch COA |
| Other limits and methods | Confirm in the current revision; do not infer values from another SNF grade |
Recommended Evaluation Workflow
- Define the cement system, target slump/flow, retention, setting and strength requirements.
- Confirm the grade designation and the test basis used for sodium sulfate.
- Use the current TDS to select an initial laboratory trial level.
- Optimise through compatibility testing; evaluate air, setting and strength as well as initial flow.
- Lock the approved grade, document revision and COA acceptance limits in the purchasing specification.
Choose the Correct SNF Grade
For applications requiring tighter sulfate control, review the 5% low-sulfate grade. For specifications written around the higher-sulfate option, see the 20% grade. The SNF product-family overview explains the shared chemistry and selection process.
Request the 18% Grade Supply Package
Send your target application, required test limits, trial plan, order volume, packaging and destination port to info@greenagrochem.com. We will confirm the current grade documentation before quotation.