One of the important properties of an abrasive is its hardness, which must be harder than the material to be processed. Mohs hardness tester is commonly used to determine the hardness of various abrasives. Another important property of abrasives is toughness or resistance to bulk. The mixing amount, purity, particle size and crystal structure of the raw materials can be changed to control this property and suit various applications.
For the manufacture of abrasive products, all raw materials must be crushed and sieved, except talcum powder and iron oxide. The screening particle size should be 4 to 900, that is, the diameter is about 6 mm (millimeter) to 6 μm (1 mm in millimeter). one) or finer. Grinding wheel is the most important abrasive product. It is mixed with abrasive and binder in a certain proportion, sintered by compression molding, and finally needs to be shaped, balanced and tested for overspeed. Abrasive cloth and sandpaper are other types of high performance abrasive products. They are bonded to the base material (cloth or paper) by abrasive grains and dried to cut to different specifications. Others are powder or granular abrasives. After screening, they need to be processed by certain processes, such as abrasive grinding or polishing, usually with mineral grease or wax to meet the needs of different working conditions.