Urethane O-rings are a type of seal or gasket made from polyurethane (urethane) rubber. They are known for their high abrasion resistance, excellent tear strength, and good flexibility. They also have good resistance to ozone, chemicals and oils. They can also withstand extreme temperatures and have good compression set resistance. Urethane o-rings are also known for their good dynamic properties, making them well suited for applications where the o-ring is in motion or subject to vibration or alternating pressure. They are commonly used in industrial, automotive and aerospace applications where high wear and tear resistance is needed.