• Product Name: Sodium Naphthalene Sulfonate
  • Appearance: Light Brown Powder
  • Type: SNF-A, SNF-B, SNF-C
  • Solid Content (%) ≥: 92
  • PH Value: 7~9
  • CAS No.: 36290-04-7
  • HS Code: 38244010

Sodium naphthalene sulfonate formaldehyde (SNF), also named poly naphthalene sulfonate (PNS) or sulphonated naphthalene formaldehyde, is light brown powder in appearance. As a commonly used high-efficiency water reducing agent for concrete, Its main chemical component is naphthalene sulfonate formaldehyde condensate. Sodium naphthalene has the characteristics of high water reduction rate, small impact on the setting time of concrete, and low air entrainment. Therefore, SNF is widely used in highways, bridges, dams, docks, tunnels, water conservancy and industrial and civil construction projects, steam curing and natural curing, prefabricated components, etc.

Naphthalene superplasticizer is the main raw material for various compound admixtures, such as pumping agent, retarding superplasticizer, early-strength superplasticizer, etc. It can be used for concrete construction where the daily minimum temperature is above 0℃, and can also be used to prepare high-fluidity concrete, high-strength concrete and steam-cured concrete.

Solid Content (%) ≥92%
PH Value7-9
Na2SO4 Content (%)≤51018
Chlorine Content (%)≤
Net Starch Fluidity(mm)≥250240230
Water Reducing Rate(%)262523
Packing25kg pp bag; 650kg Jumbo bag. A customized package is available.

Main Performance Characteristics of Sodium Naphthalene Sulfonate

High water reduction rate. In most cases, the water reduction rate of SNF can reach more than 25%. It can effectively increase the fluidity of concrete, reduce bleeding and segregation, thereby improving the workability of concrete, making it easier to construct and compact.

Enhancement. Naphthalene series superplasticizer can significantly improve the strength and durability of concrete, especially for high-strength concrete and prestressed concrete.

Adaptable. It can be adapted to various specifications and models of cement. It has good compatibility with other admixtures, and can be matched with admixtures such as expansion agents, air-entraining agents, and active admixtures such as fly ash to complement and stimulate each other.

The setting time is appropriate. This product has little effect on the initial and final setting time of cement, and the difference in setting time is generally within 1 hour.

Low sodium sulfate content. In winter, SNF does not crystallize after being formulated into a liquid, thereby solving the problem of pipe blockage caused by sodium sulfate crystallization in winter concrete manufacturing, and greatly facilitating winter concrete construction.

Good durability. SNF can effectively improve the pore structure of concrete, thereby greatly improving the durability performance indicators of concrete such as impermeability, carbonation resistance, and freeze-thaw resistance.

Easy to use. SNF powder can be used directly, or it can be dissolved in water first and used as a solution-type admixture. It is suitable for various construction environments or mixer types.

  • Dispersion.The Naphthalene sulfonate superplasticizer has excellent dispersing ability, which can evenly disperse cement particles in water and prevent their agglomeration and sedimentation. This can improve the fluidity of concrete and improve construction efficiency.
  • Adsorption. Naphthalene based superplasticizer can be adsorbed on the surface of cement particles to form a protective film to reduce water loss. This membrane has a certain degree of elasticity, which can maintain the dispersed state of cement particles and improve the plasticity of concrete.
  • Reduce water. It can reduce the water-cement ratio of concrete, thereby reducing the viscosity of concrete and reducing the amount of cement. This is important to increase the strength and durability of concrete.

(1) Oxidation of naphthalene. Use naphthalene and concentrated sulfuric acid to perform an oxidation reaction under certain conditions to generate naphthalene sulfonic acid.

(2) Formaldehyde condensation. The condensation reaction of naphthalene sulfonic acid and formaldehyde is carried out under certain conditions to generate the primary product of naphthalene series high-efficiency water reducing agent.

(3) Alkalize. Use alkaline substances such as sodium hydroxide to alkalize the primary product and adjust the pH value of the product.

(4) Dry. The alkalized product is dried to remove excess moisture.

(5) Crush packaging. The dried product is pulverized and packaged to make the finished product of snf superplasticizer.

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