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Two test specimens, 50.8 mm (2 inches) wide by 127 mm (5 inches) along the grain, shall be cut from each flooring sample tested. The specimens shall be cut from opposite sides of the flooring after all tongue and groove portions have been removed. The specimens shall be submerged in water at 24°C + 3°C (75°F + 5°F) for 4 hours, and then dried at a temperature between 49 and 52°C (120 and 125°F) for 19 hours, with sufficient air circulation to lower the moisture content (based on oven-dry weight) of the specimens to a maximum of 8 percent. This cycle shall be repeated until all specimens fail or until three cycles have been completed, whichever occurs first. The flooring shall be considered as failing when any single delamination between two plies of either specimen is greater than 50.8 mm (2 inches) in continuous length, over 6.4 mm (1/4 inch) in depth at any point, and 0.08 mm (0.003 inch) in width as determined by a feeler gauge 0.08 mm (0 003 inch) thick and 12.7 mm (1/2 inch) wide. Specimens shall be examined for delamination at the end of each cycle. Delamination due to tape at joints of inner plies or defects allowed by the grade shall be disregarded. For performing the bond line test, flooring samples shall be selected in multiples of ten in order to provide for a sufficient number of specimens (two specimens per sample) to which the acceptance levels are applied. Ninety-five percent of test specimens shall pass the first cycle, and eighty-five percent of test specimens shall pass the third cycle. 

ANSI/HPVA EF 4.2 Bond Line Test

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