Answer / Keerti Pandey

There isn't a strict lower limit to the gland surface finish for static O-rings in gaseous systems, but it should ideally be within the range mentioned (0.41-0.81 micrometers). Using a smoother surface finish below 0.41 micrometers might lead to increased sealing performance due to better conformability. However, it could also potentially increase the risk of extrusion or deformation of the O-ring under high pressure or load conditions.

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