The child smiled at that and returned to their coloring. Outside, the city dimmed into a kind of paper-gray dusk. Marta reached into her bag and smoothed the creased corner of a photocopy she kept folded there—the footnote visible like a secret—because she had learned that rules matter most when someone remembers why they were made: to hold fragments of a place so that the place could be told honestly, one sample at a time.
Porosity is a critical factor in determining the performance of thermal spray coatings, affecting: astm e2109-01 pdf
Note: These criteria are not fixed in the standard itself—ASTM E2109-01 provides methods, not pass/fail limits. End-users define acceptance based on product type and regulatory framework (e.g., USP <51>, EP 5.1.3). The child smiled at that and returned to their coloring