ISO 6441:1984

The test method is applicable on a single or multi-coat system. The result is expressed as the depth of indentation produced when an indentor of specified or between the interested parties agreed size and shape is applied to the coating under defined conditions. The method is applicable if the identation does not exceed approximately 10 % of the total coating thickness. The indentation apparatus shall be constructed so that the contact load and the test load can successively be applied to an indentor.