Sodium Naphthalene Sulphonate is a high-efficiency water reducer for concrete, also known as  Sodium Naphthalene Sulfonate Formaldehyde (SNF,PNS) etc.It is made from naphthalene, sulfuric acid, formaldehyde and liquid alkali through sulfonation, hydrolysis, condensation and neutralization reactions, and then dried into powder. Sodium Naphthalene Sulphonate is used as a superplasticizer admixture in the construction industry, a water reducer for building cement concrete, and is also mainly used as a dispersant, leather tanning agent, oil well cement water reducer, etc.