Sodium Naphthalene Sulfonate(Na2SO4 less 5%) High water-reducing rate: 20-30% ... is a high range water reducer, high concentration naphthalene-based superplasticizer, also named Naphthalene Sulfonate Formaldehyde Condensate (NSF), SNF, PNS and FDN etc ... (better). The after-mixing approach can achieve better result. Sulphonated Naphthalene Formaldehyde Condensate