Property of an elastomer seal to become squeezed behind the seal under the influence of pressure in the sliding gap, causing damage to the seal (Figure S 65).
Remedy: Another material back ring made of low-wearing plastic.
![1f91695f4051eeb2f8d452a29d30bf93c529c9c9 0001_spaltextrusion_spalteinwanderung_.gif](/fileadmin/smc/files/1f91695f4051eeb2f8d452a29d30bf93c529c9c9.gif)
Figure S 65: Gap extrusion in the case of O-rings (a); remedy (b)