An o-ring is contained in a gland and forced to flow into the surface imperfections of the glands and any clearance gaps available to it.
An o-ring can perform sealing by means of squeeze under low pressure conditions. The extent of extrusion depends upon the hardness of O-ring, the pressure, and the size of the clearance gap.
EXTRUSION LIMITS CHART
EXTRUSION PRESSURE INFO
|Hardness (Shore A)||Pressure (PSI)|
|Below 500||500 – 1000||1000 – 1500||1500 – 2000||2000 – 3000|