1. Wear resistance cavity blank in the blank plastic denaturation process, in the cavity surface flow, sliding, resulting in a type of surface and blank friction. Therefore, wear resistance is one of the most basic and important properties of the mold. The main factor affecting the wear resistance is the hardness, usually the higher the hardness of the injection mold parts, the less wear and tear, the better the wear resistance.

　　2. Strong toughness most of the study of the mold working environment conditions are very harsh, some often bear a great impact load capacity, which may cause brittle fracture. In order to avoid the mold design parts in the work of sudden brittle fracture, the mold should have high strength and toughness. Injection mold processing mold toughness depends mainly on the material's carbon content, grain size and organizational structure.

　　3. Fatigue fracture characteristics. In the mold design work development process, in the cyclic stress of the long-term role, often cause students fatigue fracture. It has a smaller energy through multiple impact fatigue fracture, tensile fatigue fracture and bending fatigue fracture. Injection molding mold fatigue fracture system performance research mainly depends on the strength, toughness, hardness and inclusion content of the material.

　　4. High temperature performance.The higher the working temperature of the injection mold, it will cause a reduction in strength and hardness, wear and deformation, so it needs to have a certain degree of tempering stability.

　　5. Cold and heat fatigue.Some molds in the process of repeated heating, cooling, so that the cavity surface by tensile and compressive stress, causing surface cracking and peeling, increasing friction friction, hindering plastic deformation, reducing dimensional accuracy, resulting in mold failure. Cold and hot fatigue is one of the main failure forms of hot work mold, mold should have good cold and hot fatigue resistance.

　　6. Corrosion resistance.Some injection molds will produce strong corrosive gases after heating, corrosion of the mold cavity surface, increasing its surface roughness, aggravate wear. Therefore must have a certain degree of corrosion resistance.