Sodium Naphthalene Sulfonate is a high-range water reducer and high-concentration naphthalene-based superplasticizer used in making flowable, strong, or steam-curing concrete. It meets chemical admixture specifications for concrete and is suitable for various applications. It has a high water-reducing rate, strength enhancement, and compatibility with various cement varieties. It has low sodium sulfonate content, is safe, and has effective durability. FDN-A can be added directly or dissolved in water, and should be stored in a well-ventilated, dry warehouse.