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    Weatherability checklist

    This powder coating weatherability liftetime checklist interrelates the material choice,the pretreatment,the environmental corrosivity classes and the expected lifetime.

    Substrate Pretreatment Primer Topcoat Total Layer
    Thickness(um)
    Environmental
    Corrosivity Class
    C1-C3 C4 C5
    Aluminum Chromatation Or
    Chrome-Free Chemical
    Conversion Layer
    - PT 80 C B *
    EM PT 130 C C *
    Oxyprim (Washprimer) - PT 80 B - -
    EM PT 130 B A -
    Steel Metallisation - PT 80 C A -
    EM PT 130 C B *
    Hot-Dip Galvanisation
    + Softly Shotblasting
    With Corundum
    - PT 80 C A -
    EM PT 130 C B -
    HotDip Galvanisation +
    Chromatation Or
    Tricationic Phosphatation
    - PT 80 C C -
    EM PT 130 C C *
    Shotblasting Zincoprim PT 130 C B -
    Tricationic Phosphatation - PT 80 C B -
    EM PT 130 C C -
    Tricationic Phosphatation +
    Cataphoretic Liquid
    Primer (KTL)
    - PT 100 C C *
    Iron Phosphatation - PT 80 A** - -
    EM PT 130 A** - -
    Legend
    Expected lifetime
    A 2 - 5 years
    B 5 - 10 years
    C > 10 years

    *: to be checked per project
    **: if C1 = >10 years
    EM = epoxy powder primer
    PT= polyester topcoat

    Environmental Class

    Environmental class Some environmental examples
    Inside Outside
    C1
    Very low
    Heated buildings with clean atmosphere
    (shop,
    office, hospital)
    C2
    Low
    Unheated buildings where condensation
    can
    occur (sports hall, warehouse)
    Atmosphere with low pollution,
    mostly rural
    C3
    Intermediate
    Production area with high humidity
    and some
    air-pollution
    (laundry, brewery, dairy factory)
    Urban or industrial areas with moderate
    SO2 pollution; coastal areas
    with low salinity
    C4-High Chemical factory, outdoor swimming pool,
    shipyard and dockyard in coastal area
    Industrial areas with high SO2 pollution and
    coastal areas with moderate salinity
    C5-
    Very high (industrial)
    Buildings with almost permanent
    condensation and high pollution
    (indoor swimming pool)
    Industrial areas with high humidity and
    aggressive atmosphere
    C5-M
    Very high (marine)
    Buildings with almost permanent
    condensation and high pollution
    Coastal and offshore areas with high salinity
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