Last updated 24th April 2024

ASTM D4138 Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems

ASTM D4138 explains how to estimate the dry film thickness of coating films by looking at tiny, precisely angled slices in the film under a microscope. The coating film may need to be repaired if these treatments are used. There are three methods available for determining the protective coating systems' dry film thickness. The first method uses tools for carving grooves. The second method uses grinding tools. In the third method, tools for drill bits are used.

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    Introduction to ASTM D4138

    The dry film’s thickness significantly impacts many aspects of the coating, including adhesion, flexibility, and harness. Measuring film thickness precisely to compare findings from several operators is crucial. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ASTM D4138 tests for our clients. The majority of protective and high-performance coatings are applied by specifications for the system as a whole, each coat’s dry-film thickness, or both. For coatings to perform as intended, they must be applied within specific minimum and maximum thickness tolerances.

    ASTM D4138 Test Method

    Using a Carbide tip to cut a grooveA precise angle is carved into the groove concerning the surface. 
    Use of High-speed rotary grinding diskIt is used to create partially cylindrical coating cavities.
    The cavities’ axes can be positioned at different angles of inclination concerning the surface. 
    Use of a specific angle tipA conical hole in the coating with a particular type of angle-tipped drill bit is made. This process is frequently applied to extremely thin, brittle, or hard coatings.

    ASTM D4138 Test Specimen

    Specimen DetailThe coated structure, component, or part that has to have its thickness evaluated can serve as the test specimen. Alternatively, test panels with comparable materials and surface roughness can be used to quantify the coating thickness.
    Specimen SizeThe surface could have a slight curvature or be level. It is possible to measure pipes in the axial direction as tiny as 25 mm (1 in.) in diameter. Depending on the blade’s cutting angle, the thickness measuring range usually is 2 to 2000 microns (0.1 to 80 mils).

    ASTM D4138 Test Result

    The dry film’s thickness significantly impacts many aspects of the coating, including adhesion, flexibility, and harness. Measuring film thickness precisely to compare findings from several operators is crucial. ASTM D4138 provides an effective way to measure film thickness. 

    Tests Related to ASTM D4138

    ASTM D4138 is related to tests including ASTM D823 for producing uniform film thickness, ASTM D1005 for dry film thickness measurement, and ASTM D7091 for the non-destructive thickness measurement of films.

    FAQ's

    Where can I get the astm d4138 tested?

    You can share your astm d4138 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 astm d4138 test to various testing techniques.

    How much do I need to pay for the astm d4138 test?

    Please contact us for a detailed quote for your astm d4138 testing needs. Cost incurred to carry out different astm d4138 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 astm d4138?

    The required number of samples or specimens should comply with the procedure given in the astm d4138 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 astm d4138 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 astm d4138 test?

    The turnaround time for astm d4138 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 astm d4138 tested?

    You can share your astm d4138 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 astm d4138 test to various testing techniques.

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