Material of hydraulic filter element：
1. Metal material (stainless steel, copper, wire mesh)
2. Filter paper material (wood pulp filter paper, glass fiber filter paper)
3. Fiber material (plant fiber, synthetic fiber)
4. Non-metal sintered materials (sintered felt, sintered mesh)
5. Other materials (PTFE, etc.)

The hydraulic filter element mainly has the following functions:
1. Filter impurities: It can effectively remove solid particles, rust, sludge and other impurities in the hydraulic system, preventing these impurities from entering the system and causing wear, blockage and other damage to hydraulic components.
2. Protect components: Ensure the normal operation of key components such as pumps, valves, and cylinders in the hydraulic system and extend their service life.
3. Improve system reliability: Reduce failures caused by impurities and improve the working reliability and stability of the hydraulic system.
4. Keep the oil clean: Keep the hydraulic oil clean at all times to ensure the performance and efficiency of the system.