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Durapass 720

Product description

Durapass.720 is special additives used to inhibit formation of rust during the process and after acid pickling of steel.


  • Durapass.720 can be used in spray and dip applications.


  • Durapass.720 neutralizes and protects steel after pickling
    in enameling and phosphating lines.

Physical & Chemical Properties

Appearance: Powder.
Color :White to yellowish
PH(1%) at 25oC :10.5 ± 0.3
Total Alkaline point (1%): 11.5 ± 0.3
Free Alkaline point (1%): 6.9 ± 0.3

Solubility in water
(under desired quantity) :Soluble


Tank can be fabricated from hard mild steel, or stainless

Process Sequences

  •  Phosphating with Duraphos products system or galvanizing process.
  •  DI Water Rinse
  •  Passivation with Durapass 712.
  •  Drying

Operating Parameters

Concentration (W/V %): 0.3 to 0.7
Temperature (o C) :40 to 50
Pointage: 2 to 5
Time (min) :0.5 to 3

Process Sequences

  •  Degreasing, & cleaning.
  •  Pickling
  •  Rinse.
  •  Passivation & Neutralization by Durapass 720
  •  Rinsing
  •  Metal finishing ( Enameling or phosphating)


Add 1.5 kg of Durapass 720 per 1000 liters of working solution to increase the free alkalinity by one point.

Storage Information

Storage & Handling

Keep bags tightly closed. Keep bags in a cool, well-
ventilated area. Do not expose to direct sun.

Corrosive products keep away from Acids, alcoholic and oxidizing materials .Store in temperature not above 40oC.

Shelf Life
Two years from date of production if stored in normal
Packaging Type
Woven polypropylene lined bags.
Standard Packing
Durapass 720 is available in 25 Kg PP bags.

Reagents & Equipments

 0.1N Sulfuric acid

  •  phenolphthalein Indicator
  •  Conical Flask 250 ml.
  •  Burette 50 ml.
  •  10 ml Pipette.                                                                              Analysis “Free Alkalinity Points, FAP”
  • Take 10 ml of Durapass 720 working
    solution in a conical flask.
  •  Add few drops of phenolphthalein Indicator.
  •  Titrate the solution against 0.1N Sulfuric acid
  •  End point pink to colorless.
  •  Record mls used of Sulfuric acid used as 
  • Consumed mls will give FAP.
  •  Free alkaline points should be maintained
    between 2.0 to 5.0 points.
    Durapass 720 concentration (g/l) = A x 1.45