These test methods are recommended for elementary quantification of the stereological properties of porous coatings and the solid substrates to which they are bonded.

These test methods may be useful for comparative evaluations of different coatings or different lots of the same coating.

All three methods should be performed on the same working surface.

A statistical estimate can be made of the distributions of the mean coating thickness and the volume percent void. No estimate can be made of the distribution of intercept lengths unless the void is a regular geometric shape that can be defined mathematically.

1.1 This test method covers stereological test methods for characterizing the coating thickness, void content, and mean intercept length of various porous coatings adhering to nonporous substrates.

1.2 Porous coatings with significant gradients in the porosity from the substrate to the surface will require use of the alternate sample orientation method outlined in 8.2.

1.3 The values stated in SI units are to be regarded as the standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.