GB/T 6739-2022 《Paints and varnishes—Determination of film hardness by pencil test》 Related products

GB/T 6739-2022 "Determination of paint film Hardness by Paints and varnish Pencil Method" standard specifies the method of hardness testing of coatings using pencils. This standard is suitable for evaluating the performance of paint films under various Hardness, especially for the quality control of Coatings and varnishes. During the test, by using pencils of different Hardness (from hard to soft), a certain pressure is applied to the surface of the paint film and observe whether the pencil can leave a clear mark without scratching or cutting the paint film. The purpose of this method is to provide a simple and reliable means of evaluating the Hardness of paint films to guide the quality control in the manufacturing and application of coatings.