is the current international standard for determining the volume fraction of microstructural phases or constituents in solid materials through a systematic manual point count . Grounded in the principles of stereology , this method provides a statistically unbiased way to quantify material components—such as ferrite in steel or reinforcement in composites—using two-dimensional images. Core Methodology of ASTM E562-19
ASTM E562-19 is a standard practice that outlines the procedures for measuring and reporting the thickness of coatings applied to substrates. This standard provides a systematic approach to ensure that coating thickness measurements are continuous, accurate, and reliable. The practice covers a range of coating types, including paints, varnishes, and other applied finishes. astm e56219 pdf
ASTM offers a 1-page scope preview for free on their website. The full requires purchase. is the current international standard for determining the
The test relies on superimposing a regularly arrayed grid of points over a magnified image (micrograph) of a polished and etched specimen. This standard provides a systematic approach to ensure
: It applies to opaque materials where distinct phases can be identified, such as metals and alloys (e.g., ferrite in duplex stainless steel), ceramics , and composites .
To achieve statistical significance, ASTM E562-19 requires counting a minimum total number of points (typically 400 to 1,000) across at least five or more random fields. The standard also provides guidelines for calculating 95% confidence intervals using the binomial distribution, ensuring the estimate's precision.