as it is structured in order of work-flow, which means that. Pressure-sensitive tape is applied over the crosshatch cut. This specification provides the basis for painting and decorating in building construction. ![]() Tape is removed by pulling it off rapidly back over itself as close to an angle of 180°.Ī crosshatch pattern is made through the film to the substrate.ĭetached flakes of coating are removed by brushing with a soft brush. Tape is smoothed into place by using a pencil eraser over the area of the incisions. Pressure-sensitive tape is applied over the cut. There are two methods described in the ASTM Specification ASTM D 3359 Test Method A Īn X-cut is made through the film with a carbide tip tool to the substrate. When testing a multi-coat system, determination of the resistance to separation of different layers from one another can be accomplished. History textbooks and primary school teachers paint a stoic picture of the. ![]() One common scribe is fitting baseboard to a hardwood floor. This means the country turned 243 years old in 2019. The cross-cut test is a method for determining the resistance of paints and coatings to separation from substrates by utilizing a tool to cut a right angle lattice pattern into the coating, penetratingĪ quick pass/fail test can be accomplished through this method. Scribing is a practice where a carpenter fits a finish element to an irregular or uneven surface. The force that is applied gradually increases and is monitored until a plug of coating is detached, or a previously specified value is reached. ![]() Then the testing apparatus is attached to the loading fixture and is then aligned to apply tension perpendicular to the test surface. The test is done by securing loading fixtures (dollies) perpendicular to the surface of a coating with an adhesive. Creepage is defined as the degree of corrosion (usually measured in mm) emanating away from a scribe line underneath a coating film applied to a steel substrate. Unlike the other methods, this method maximizes the tensile stress, therefore results may not be comparable to the others. The adhesion of a coating or several coated sample of any paint product is measured by assessing the minimum tensile stress needed to detach or rupture the coating perpendicular to the substrate.
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