Last updated 1st May 2024

ASTM D7091 Standard Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings on Ferrous and Non-Ferrous Metals

ASTM D7091 describes the non-destructive measurement of the dry film thickness of nonmagnetic coatings applied to ferrous metal surfaces using magnetic gages, followed by the non-destructive measurement of the dry film thickness of electrically nonconductive, nonmagnetic coatings applied to nonferrous metal surfaces using eddy current gages. ASTM D7091 provides the procedures and recommended frequency for evaluating gauge accuracy and adjusting and optimizing the equipment, as well as a frequency for measuring coating thickness.

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    Introduction to ASTM D7091

    Type 1 magnetic pull-off gages assess how much force is necessary to detach a permanent magnet from a coated ferrous metal substrate. They employ a spring or coil to resist the magnetic force, applying tension until the magnet’s attraction is overcome. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ASTM D7091 tests for our clients. The force that holds the magnet to the ferrous base is inversely proportional to the coating layer thickness. ASTM D7091 involves evaluating coating thickness measuring gages and taking measurements on ferrous and non-ferrous metal substrates.

    ASTM D7091 Test Method

    Applying CoatingThe magnetic or non-magnetic coating base is applied to the material depending on whether it’s ferrous or nonferrous
    Measuring Coating Thickness by using gageCoating thickness can be measured with several gauges. These gages are characterized as “magnetic pull-off” or “electronic.” They use a sensing probe or magnet to determine the distance (gap) between the base metal and the probe. The gauge displays the measured distance as coating thickness.

    ASTM D7091 Test Specimens

    Specimen DetailNonmagnetic coatings are applied on the surface of ferrous metals using magnetic gages.Electrically nonconductive, nonmagnetic coatings are applied to the surface of nonferrous metals using eddy current gages.
    Specimen SizeThe test specimen might be either the coated structure or component/part on which the thickness is to be evaluated, or test panels with identical roughness, shape, thickness, composition, and magnetic characteristics on which the coating thickness is to be measured.

    ASTM D7091 Test Result

    ASTM D7091 describes non-destructive methods for determining the dry film thickness of coatings applied to metallic surfaces. It covers the use of magnetic gages for ferrous metals and eddy current gages for nonferrous metals, ensuring accurate measurements without harming the coating.

    ASTM D7091 Related Tests

    ASTM D7091 is related to tests including ASTM D609 for preparing cold-rolled sheets, ASTM D823 for producing films with identical thickness, and ASTM D1730 for preparing aluminum for surface painting.

    FAQ's

    Where can I get the astm d7091 tested?

    You can share your astm d7091 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 d7091 test to various testing techniques.

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    Please contact us for a detailed quote for your astm d7091 testing needs. Cost incurred to carry out different astm d7091 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 d7091?

    The required number of samples or specimens should comply with the procedure given in the astm d7091 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 d7091 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 d7091 test?

    The turnaround time for astm d7091 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 d7091 tested?

    You can share your astm d7091 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 d7091 test to various testing techniques.

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