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This study investigates the surface roughness (Ra) of experimental materials, focusing on the filler and matrix areas. The results indicate that the Ra of the filler area is significantly larger than that of the matrix area for FL-30 and FC-30 materials. Conversely, the matrix areas of FL-30 and FC-30 exhibit similar Ra values comparable to the Ra of sample F-0. Overall, the Ra values for FL-30 and FC-30 are nearly equivalent to those of a PTFE plate, providing insights into the texture characteristics of these materials.
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filler area filler area matrix area matrix area Sup-Fig. 1. Surface roughness (Ra) of the experimental materials on area based analysis. Ra of filler area was significantly larger than Ra of matrix area in case of FL-30 and FC-30. Matrix area of FL-30 and FC-30 had similar value with Ra of F-0. While, overall Ra value of FL-30 and FC-30 was almost same as Ra of PTFE-Plate.