company tower banner
King Industries Company Logo
NA-SUL® 437 is a water soluble rust preventive concentrate ideally suited for the manufacturing of water-based rust preventive fluids. NA-SUL® 437 based products have excellent solubility, stability and tolerance for hard water.

Functions: Corrosion Inhibitor

Chemical Family: Sulfonates, Sulfonic Acids & Derivatives

Technical Data Sheet
  • TypeDocument Name
View All Documents

Knowde Enhanced TDS

Identification & Functionality

Fluids & Lubricants Functions
Chemical Composition

Preparation of dinonylnaphthalenesulfonic acid, organic acid complex and an amine

Features & Benefits

Product Advantages
  • Deposits extremely thin hydrophobic films
  • Easily cut back in cold water
  • Thin film formation allows fast drying
  • Film is easily removed with alkaline cleaner
  • Solutions are very hard water tolerant
  • Product concentrate and dilutions have long term stability

Applications & Uses

Use Level
0.5% - 5.0% (Water soluble rust preventive fluids)
Product Uses
  • NA-SUL®437 is a unique water soluble rust preventive concentrate. It can be cut back in either cold or warm water. NA-SUL® 437also shows excellent hard water tolerance. It exhibits exceptional storage stability both as the concentrate and in water solutions.
  • Unlike most water soluble rust preventive additives, NA-SUL® 437 deposits a thin film upon metal parts that becomes hydrophobic during drying. This enables parts to resist rusting for extended periods, even in the 100% humidity environment of the Humidity Cabinet (ASTM D 1748) test. The thin protective film can easily be removed with alkaline cleaners. Water solutions of NA-SUL® 437 are ideal for dip application of metal parts for protection during indoor storage. Wet parts may be dipped in NA-SUL® 437 solutions replacing the need for solvent based dewatering fluids.
  • To achieve foam control in NA-SUL® 437 solutions, it is recommended to use Foamban® MS-525 (Munzing, Inc. Bloomfield, NJ.). Add the antifoam at a concentration of 0.1% of the NA-SUL® 437 concentration in the solution.
  • A typical formulation based on 1000 g could be: 950 g water, 49.95 g NA-SUL® 437 and 0.05 g Foamban MS-525.
  • Properties

    Physical Form
    Appearance
    Clear amber liquid
    Soluble in
    Water, Glycols, Alcohols
    Typical Properties
    ValueUnitsTest Method / Conditions
    Viscosity (at 40°C)300cStASTM D 445, DIN 51 550
    Density (at 25°C)0.99g/mLASTM D4052
    Weight (at 25ºC)8.3lbs/gallon
    Flash Pointmin. 100°CASTM D 92, DIN 51 376, Cleveland Open Cup (COC)
    Solubility Information
  • Soluble in water at all concentrations.
  • Soluble in alcohols and glycols.
  • Packaging & Availability

    Packaging Type
    Standard Packaging

    440 lbs (200 kg) closed head drum

    Storage & Handling

    Shelf Life
    3 Years
    Storage Conditions
  • Store in a cool, dry place away from any direct source of heat and moisture.
  • Maximum recommended storage temperature: 46°C (115°F)
  • Handling
    • Avoid all personal contact.
    • Observe good personal hygiene.