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  • Porosity Testing

    The gap of the coating refers to the small channels from the surface of the coating to the base metal. The porosity of the coating reflects the density of the coating surface, and the porosity directly affects the protective ability of the protective coating. As a coating with special performance requirements, the measurement of porosity is also very important, which is an important index to measure the quality of coating. As a professional reliability third-party testing organization, T,C&A Lab can perform porosity testing according to ISO, ASTM and other standards. Welcome to contact our experts for consultation.

    T,C&A Lab's porosity testing methods include:

    • Chemical method

    A. Impregnation test: iron reagent test, acid copper sulfate solution test, cadmium sulfate test, hydrogen peroxide test, sodium chloride / hydrogen peroxide solution test, etc
    B. Solvent spreading test: iron reagent test
    C. Filter paper test: iron reagent test, organic indicator test
    D. Salt spray test: neutral salt spray test, acetic acid salt spray test
    E. Gas atmosphere test: NH3, SO2, H2S, HNO3

    • Electrochemical method

    A. Anode treatment: iron reagent test
    B. Electrolytic imaging test: photographic paper test, gypsum indentation test, colloidal medium test, analytical determination

    • Physical method

    A. Optical method
    B. Gas permeability method
    C. Ultrasonic method
    D. Autoradiography and isotope method
    E. High voltage or high frequency method

    Standards we test to

    ISO 2738Sintered Metal Materials, Excluding Hardmetals — Permeable Sintered Metal Materials — Determination of Density, Oil Content and Open Porosity
    ISO 4524-3Metallic Coatings — Test Methods for Electrodeposited Gold and Gold Alloy Coatings — Part 3: Electrographic Tests for Porosity
    ISO 10308Metallic Coatings — Review of Porosity Tests
    ASTM B583Test Method for Porosity in Cold Coatings on Metal Substrates

    In addition, the experts in our Porosity Testing Laboratory also provide a variety of custom tests as your needs and requirements. Let's discuss the custom service with our experts for free.

    Instruments and data

    Porosity Testing 1
    Porosity Testing 2
    Porosity Testing 3
    Porosity Testing 4
    Porosity Testing 5


    1. Zhang, S. D.; et al. Effect of porosity defects on the long-term corrosion behaviour of Fe-based amorphous alloy coated mild steel.[J]. Corrosion Science, 2016.

    Note: this service is for Research Use Only and Not intended for clinical use.


    T,C & A LAB is an independent lab providing quality or custom testing, characterization and analysis of a variety of materials. Our engaged experts are ready to help you.

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