Cased Lip Seal
Cased lip seals are the most robust design when considering a rotary seal. Metal-to-metal press-fit ensures that the seal is located solidly in the hardware and provides a tight seal. Additional sealing at the press-fit area can be obtained by adding a spray on seal coat to the OD of the seal. The majority of lip seals operate with media pressure less than 75psi (0.5Mpa). With cased lip seals, the pressure rating can be increased by incorporating extra seal elements and/or using the metal case material to back-up the PTFE seal element. These seals are commonly used in applications sealing oil such as gearboxes, pumps, transmissions and bearings.