After testing the hardness of metal, the three types. This concludes that if the highest the HV value, It will be most hardness. we found that Stainless have the most hardness and the second is metal then the last one is aluminum.
From experiment we use the specimen sample 3 type by Vickers hardness test. We can sort the hardness of the material descending by The first is stainless so type of material is metal, The second is PP so type of material is polymer and The third is glass slide so type of material is ceramic. So that stainless have most hardness of the material, PP have hardness of the material more than glass slide and less than stainless and glass slide have least hardness of the material.