8. Calculation and Interpretation of Results8.1 If instructed by the manufacturer, use the instrumentcalibration factors to convert the indicated force for each testinto the actual force applied.8.2 Either use the calibration chart supplied by the manu-facturer or compute the relative stress applied to each coatingsample as follows:X 5 4F/pd 2 (1)where:X = greatest mean pull-off stress applied during a pass/failtest, or the pull-off strength achieved at failure. Bothhave units of MPa (psi),F = actual force applied to the test surface as determined in8.1, andd = equivalent diameter of the original surface areastressed having units of inches (or millimetres). This isusually equal to the diameter of the loading fixture.8.3 For all tests to failure, estimate the percent of adhesiveand cohesive failures in accordance to their respective areasand location within the test system comprised of coating andadhesive layers. A convenient scheme that describes the totaltest system is outlined in 8.3.1 through 8.3.3. (See ISO 4624.)N OTE 7—A laboratory tensile testing machine is used in ISO 4624.8.3.1 Describe the specimen as substrate A, upon whichsuccessive coating layers B, C, D, etc., have been applied,including the adhesive, Y, that secures the fixture, Z, to the topcoat.
8. Calculation and Interpretation of Results<BR>8.1 If instructed by the manufacturer, use the instrument<BR>calibration factors to convert the indicated force for each test<BR>into the actual force applied.<BR>8.2 Either use the calibration chart supplied by the manu-<BR>facturer or compute the relative stress applied to each coating<BR>sample as follows:X 5 4F/pd 2 (1)<BR>where:<BR>X = greatest mean pull-off stress applied during a pass/fail<BR>test, or the pull-off strength achieved at failure. Both<BR>have units of MPa (psi),<BR>F = actual force applied to the test surface as determined in<BR>8.1, and<BR>d = equivalent diameter of the original surface area<BR>stressed having units of inches (or millimetres). This is<BR>usually equal to the diameter of the loading fixture.<BR>8.3 For all tests to failure, estimate the percent of adhesive<BR>and cohesive failures in accordance to their respective areas<BR>and location within the test system comprised of coating and<BR>adhesive layers. A convenient scheme that describes the total<BR>test system is outlined in 8.3.1 through 8.3.3. (See ISO 4624.)<BR>N OTE 7—A laboratory tensile testing machine is used in ISO 4624.<BR>8.3.1 Describe the specimen as substrate A, upon which<BR>successive coating layers B, C, D, etc., have been applied,<BR>including the adhesive, Y, that secures the fixture, Z, to the top<BR>coat.
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