The ASTM D4145 test describes a procedure that allows to evaluate the flexibility and adhesion of organic coatings on metal sheets after they have been gradually bent. Following each bending, the panels are inspected with a low magnification tool as a means to detect slits in the film. As for adhesion, it is measured by applying and removing a pressure sensitive tape over the bend.
The purpose of ASTM D4145 is to evaluate the ability of a coating system to withstand fabrication strains using the T-twist test. In other words, this test characterizes the flexibility and adhesion of the coating after being subjected to bending stress, and it is possible to evaluate these properties using the degree of T-twist it is possible. In fact, by curving a coated metal foil around itself or around a mold, it is possible to study the behavior of the coating against the bending stress that can occur during the manufacturing process of the sheet metal.
More importantly, this test consists of the presence of cracks and pickoffs in the coating of the specimen, using a magnification tool and a pressure-sensitive tape as a means to determine the degree of T-bent, for each twist performed. The latter corresponds to the amount of metal required to obtain the slit or to remove the coating on the bent specimen.
More precisely, if the sample is bent around itself, the grading is defined as the minimum number of metal thickness required to observe the previously stated criteria, but if the sample is bent around a die, the grading corresponds to the metal equivalent of the diameter of the die used to witness the specified criteria. Finally, this procedure is a tool to verify if the coating can withstand a manufacturing process that may involve various deformation operations.
The number of samples required is one and reduce the size to 2 by 6 (50 by 150 mm). Bending can take place around a die or around a sample and measures need to be taken to ensure this process runs smoothly and smoothly.
Values stated in inch-pound units should be considered standard. The values in parentheses are provided for information only and are mathematical conversions to non-standard accepted SI units.
This standard is not meant to address all safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to determine appropriate safety, health and environmental practices and to determine the applicability of regulatory restrictions prior to use.
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