A radial shaft sealing ring for sealing of a casing part of a motor vehicle engine or gearbox, with a supporting body and a sleeve-type sealing lip connected to the supporting body and bent towards the side to be sealed, which sealing lip lies on an axial length L on the shaft and has a conveying groove in the area of contact with the shaft for conveying of medium back into the volume to be sealed, and which sealing lip has a sufficient bending elasticity to achieve a sufficient contact pressure without the use of additional means, wherein the material of the sealing lip essentially consists of a high temperature cross-linked LSR liquid silicone material.