Chloride(Cl ion) in naphthalene sulfonate formaldehyde condensates sodium salts mainly come from caustic soda, which is a raw material of naphthalene sulfonate formaldehyde condensates sodium salts synthesis.Because caustic soda is made from sodium chloride.
There are two main production processes for caustic soda made from sodium chloride:ionic membrane method and isolating membrane method.Chloride contained in caustic soda that made by isolating membrane method is higher than that caustic soda made by ionic membrane method.Price of caustic soda that made by isolating membrane method is cheaper.Many naphthalene sulfonate formaldehyde condensates sodium salts manufacturers use caustic soda that made by isolating membrane method,it can lower naphthalene sulfonate formaldehyde condensates sodium salts price,But it will result the chloride contained gets higher,Chloride contained in naphthalene sulfonate formaldehyde condensates sodium salts is very low.
Our factory uses caustic soda made by ionic membrane method,

Chloride(Cl ion) corrodes reinforcing bars in construction,it is an important index that have to control.
Our naphthalene sulfonate formaldehyde condensates sodium salts,chloride contained is 500ppm max.