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Product description

  • Durapass.714.A and Durapass 714B are two component
    system specifically formulated to give chrome free
    conversion layer on aluminum.
  • Durapass.714.A/B are QUALICOAT approved products
    for chrome free passivation.


  • Durapass.714 A/B is specially formulated liquid product for spray and immersion system for aluminum alloys.


  •  Durapass.714 A/B is formulated as a NO-Rinse
    passivation for aluminum pretreatment line industry to
    provide superior adhesion and a good corrosion
  •  Durapass.714.A/B is an environmental friendly product
    producing thin uniform transparent chromium free coating
    at low concentration and temperature on aluminum

Physical & Chemical Properties

  • Durapass.714A
    Color             Pale yellow liquid
    Odor              Characteristic
    PH (1%) at 25oC          3.4 ± 0.2
    Density at 25oC          1.03 ±0.02 g/cm3
    Miscibility in water                Miscible
  • Durapass.714B
    Color         Colorless liquid
    Odor              Characteristic
    pH (1%) at 25 oC         2.3 ± 0.2
    Density at 25 oC             1.06 ± 0.03 g/cm3
    Miscibility in water                Miscible


Main tank can be fabricated from hard PVC or
stainless steel or fluoride resistant plastic. All other
equipments in contact of stainless steel 316.

Process Sequences

  •  Cleaning, Degreasing, Etching, desmutting .
  •  Rinse with water
  •  Rinse with D.I water
  •  Passivation using Durapass 714 A/B.
  •  Drying

Operating Parameters

            Concentration (v/v %)
Durapass 714A           1.2
Durapass.714B               1.7
pH                                       2.5-3.2
Time (sec)                 30 to 90 
Temperature (0C)               25 to 35
Nozzle pressure (Bar)                1.0 to 1.5
Maximum Iron Content                  10 ppm

Initial preparation

  • Add 12 litter of Durapass.714A & 17 liter of Durapass.714B per 1000 Liter.


  • Bath is sensitive to iron contaminations.

  •  D.I water should be used to prepare the bath
    with max conductivity 50 μS.