A transparent overlay containing a regular grid array of points (usually formed by the intersections of lines) is chosen. Common grid sizes specified by the standard include: ( 25-point grid ( 49-point grid ( 100-point grid (
: Official electronic copies can be reviewed via the ANSI Webstore or the ASTM Compass Digital Library . Core Stereological Principles
: Counted if the grid point falls completely within the phase of interest. astm e56219 pdf
Avoid selecting fields because they "look typical." Implement a rigid, blind mechanical indexing system for shifting the microscope stage.
: For a "helpful report" showing how this standard is applied in real-world testing (e.g., detecting sigma phase in stainless steel), you can reference this detailed technical paper by FORCE Technology . Standard ASTM E562-19 - Afnor EDITIONS A transparent overlay containing a regular grid array
The operator examines each point where the grid lines intersect and applies the following criteria: Counts as 1.0 . Point on the boundary of the phase: Counts as 0.5 . Point completely outside the target phase: Counts as 0.0 . 4. Sampling Strategy
In conclusion, ASTM E562-19 is a critical standard practice that ensures continuity of coating thickness measurements. Its implementation is essential in various industries where coating thickness plays a vital role in product performance, safety, and durability. By following the guidelines outlined in ASTM E562-19, organizations can improve product quality, increase efficiency, and enhance safety. As industries continue to evolve, the importance of standards like ASTM E562-19 will only continue to grow, driving innovation and excellence in coating thickness measurements. Avoid selecting fields because they "look typical
The , utilizing a multiplier ( ) outlined in the standard's reference tables.
Many university and corporate libraries provide access to ASTM standards. Conclusion
Even with the PDF in hand, users make mistakes. Avoid these:
While any number of points can be used, a 100-point (10x10) grid is common for standard evaluations like linepipe steels.
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