Polishing manufactures use abrasives such as diamond or other hard materials to flatten several materials. Generally, diamond abrasive is most popular and it is costly. Although, diamond abrasives are costly, manufacturer have to use it to reduce surface roughness such as high hardness ceramics and others. In the polishing process, it is unpopular to retrieve those abrasives from reservoir of after-using them. Therefore, using diamond abrasives account for majority of processing cost. One of the concept to overcome the cost problem, it is suggested that reducing high-cost diamond abrasives and replacing cheap and soft abrasives can reduce processing-cost. In this study, to reveal the possibility of such two different-sized abrasives polishing process, polishing tests were conducted to unearth an effect of two-hardness-abrasive polishing technique to a glass disk on reducing surface roughness. An average diameter of 127 μm GC, and 1.0 μm diamond abrasive were prepared as concept abrasives. As a result, the arithmetic mean roughness of the glass quickly decreased in the case of using 127 μm GC abrasive with 1.0 μm diamond abrasive compared to only GC or only diamond abrasives.

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