1. The raw material belt with different physical properties and oil content has good ductility and poor sealing; the oil-free raw material belt has no ductility because of removing oil and grease, but its toughness is very strong, which can improve the sealing ability. 2. The oil-free raw material belt with good insulation, chemical stability and high temperature resistance is widely used in machinery, chemical industry, metallurgy, electric power, ships, aerospace, medicine, electronics and other industries. The raw material belt with oil is often used in machinery and equipment. 3. The oil-free raw meal belt with different technology is based on the oil-free raw meal belt to remove the oil, so the technology of the oil-free raw meal belt is more complicated.