Description SNF-5 is a Sodium Naphthalene Formaldehyde. This product is made by industrial Naphthalene, Beta-sulphonate, Formaldehyde and Alkali via sulphuration, hydrolyzation, condensation and neutralization reactions. It belongs to non-air-entraining superplasticizer. SNF-5 is non-poisonous, odorless, non-flammable and non-corrosive to steel bars. SNF-5 meets the requirements of the PRC's Standardization of concrete admixture of GB8076-1997 and GB50119-2003. Features, Properties & Characteristics Item Index Value Item Index Value Appearance Light brown powder PH Value 7～9 Solid Content ≥92％ Fluidity of cement paste ≥250 mm Sodium Sulfate Content ＜5% fineness 0.315mm sieve residue<15％ Chlorides Content ＜0.3% Surface Tension （70±1）×10-3N/ m Performance Test, (Dosage, Cement×0.6％) Inspection Items Inspection Criteria Actual Results First Grade Qualified Water Reducing Rate (%, >) 20 18 21 Ratio of Bleeding Rate（％,<） 90 95 79 Air content（％） ＜3.0 ＜4.0 2.0 Difference of Set Time (min) Initial －90～＋120 +22 Final +16 Ratio of compressive strength（％） 1d ＞140 ＞130 156 3d ＞130 ＞120 152 7d ＞125 ＞115 146 28d ＞120 ＞110 138 Ratio of Shrinkage （％） 90d ＜135 82 Steel-bar Corrosion None None