What is UN piston seal? In fact, UN seal refers to the universal sealing technology between piston and piston rod, commonly known as UN seal or piston seal. And because the sealing material generally used is polyurethane rubber products, it is also called polyurethane seal. 1. The role of UN polyurethane seal and engineering working temperature Because the UN piston seal is made of polyurethane rubber, its polyurethane hardness is generally between 90. Polyurethane seals have the same size and cross-section, and the height of the inner and outer sealing lips are the same. Its sealing function is to prevent the intrusion of particulate dust, dirt and foreign objects. It is a universal shaft hole sealing ring series. The engineering environment temperature is between -40℃~+100℃. 2. The advantages of UN polyurethane seals and the reasons for their widespread use The advantages of the UN seal of the piston polyurethane are the remarkable extrusion impact resistance, the resistance to compression and the good wear resistance in the working state, and it is very suitable for operation under harsh engineering environmental conditions. Why are UN piston seals widely used? Because of its advantages, it can be used to prevent dust from heavy-duty German mechanical seal box industrial hydraulic seals (such as various types of hydraulic cylinders, cylinders, piston rods or piston seals), and has a good sealing effect.