By content81c70d6e36 | Last updated 13th June 2025

ISO 4623-1:2018 Paints and varnishes, Determination of resistance to filiform corrosion, Steel substrates

ISO 4623-1:2018 outlines a test protocol for evaluating paint or varnish coatings' ability to prevent filiform corrosion on steel surfaces caused by a scribed mark piercing the coating. It is solely appropriate for evaluating the tested coating/substrate combination's performance. It cannot be used to forecast how well a coating will work on various substrates. Several types of corrosion can result from a scribe mark cut through a paint or varnish layer on metal, including blistering of the coating, corrosion of the metal beneath the coating, and filiform corrosion.

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    Introduction to ISO 4623-1:2018

    Filiform corrosion is a type of corrosion that appears as threads beneath a layer of paint, varnish, or similar product. It usually begins at the margins or with localized damage to the coating. Specific temperature and relative humidity conditions, as well as the presence of acids, bases, or salts beneath the paint layer or at coating cracks, are known to cause filiform corrosion. These kinds of situations are frequently observed in industrial or maritime settings. There will always be some under-corrosion of the coating, beginning at the scribe mark. However, filiform corrosion is only thought to exist when the characteristic thread-like pattern is visible. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ISO 4623-1:2018 tests for our clients.

    ISO 4623-1:2018 Test Method

    Scribing of panelA coated test panel has a specific inscription. The scribed mark is exposed to a small amount of sodium chloride, either by dipping the panel into a salt solution or by being exposed to salt fog. 
    Exposure of panelAfter that, the panel is exposed to 40 °C and 80% relative humidity in a test cabinet. The interested parties agree on criteria in advance to evaluate the consequences of exposure; these criteria may be subjective.

    ISO 4623-1:2018 Test Specimens

    Specimen DetailCoatings of paints and varnishes are used as specimens for ISO 4623-1:2018
    Specimen SizeThe ground steel test panels must have minimum dimensions of 150 mm × 75 mm × 0.3 mm.

    ISO 4623-1:2018 Test Results

    ISO 4623-1:2018 centers on identifying the materials’ ability to withstand filiform corrosion on steel substrates. The findings offer important new information about how well different coatings work to stop this particular kind of corrosion, which appears as filaments beneath the paint layer.

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    ISO 4623-1:2018 Testing
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    ISO 4623-1:2018 Related Tests

    ISO 4623-1:2018 is related to tests, including ISO 1513 for preparing samples of paints for testing, ISO 1514 for preparing standard panels, and ISO 2808 for calculating the paint film thickness.

    FAQ's

    Where can I get the iso 4623 1 2018 tested?

    You can share your iso 4623 1 2018 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific iso 4623 1 2018 test to various testing techniques.

    How much do I need to pay for the iso 4623 1 2018 test?

    Please contact us for a detailed quote for your iso 4623 1 2018 testing needs. Cost incurred to carry out different iso 4623 1 2018 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.

    How many samples are required for iso 4623 1 2018?

    The required number of samples or specimens should comply with the procedure given in the iso 4623 1 2018 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.

    How much discount can I get on the iso 4623 1 2018 test?

    MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.

    How many days will it take to complete the iso 4623 1 2018 test?

    The turnaround time for iso 4623 1 2018 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

    Where can I get the iso 4623 1 2018 tested?

    You can share your iso 4623 1 2018 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific iso 4623 1 2018 test to various testing techniques.

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