Oil seals, also known as rotary shaft seals, are mechanical seals that are used to seal oil and other lubricants in rotating equipment such as motors, pumps, and gearboxes. They are designed to prevent leaks while also keeping dirt, dust, and other contaminants out of the equipment. Oil seals typically consist of a rubber sealing lip, a metal case, and a spring. The rubber sealing lip makes contact with the shaft, creating a seal, while the metal case and spring provide support and keep the lip in contact with the shaft. The oil seal's lip is typically made of Nitrile rubber, Fluoroelastomer or Polyacrylate which are resistant to the oils and greases used in the machinery. Oil seals are commonly used in automotive, aerospace, and industrial applications to ensure the smooth operation and longevity of the equipment.