SNF-B suphonated naphthalene formaldehyde powder for concrete admixtures. SNF-B Superplasticizer1.Product GeneralSNF-B Superplasticizer is a dry powdered admixture. It is produced through such a process: 1) sulphonating refined naphthalene with sulfuric acid, 2) condensing with formaldehyde, 3) neutralization, and 4) filtering. It conforms to GB8076-1997 and is mainly used for various high- ...