Gaskets, Seals, O-Rings & Elastomer Components worked example

Seal Groove Fill with seal cross-section area of 18 mm²: a worked example

What does the result look like when seal cross-section area reaches 18 mm²? The full calculation is worked below with real intermediate numbers. Use it when an applications engineer needs a quick gland fill check before reviewing O-ring squeeze, stretch, thermal expansion, swell, pressure, and tolerance stack-up in more detailed seal design software.

The inputs for this scenario

  • Seal cross-section area: 18 mm² (raised for this scenario; the documented default is 7.07)
  • Available groove area: 10.2 mm² (unchanged)
  • Percent conversion factor: 100 x (unchanged)

Working through the calculation

  • Applying the documented formula (Seal groove fill = seal cross-section area ÷ available groove area × percent conversion factor) to the inputs above produces each figure below.
  • At this operating point the engine returns 176 % for seal groove fill, the number this scenario is built around.
  • At this operating point the engine returns 1.76 value for seal-to-groove area ratio.
  • At this operating point the engine returns 100 x for percent conversion factor.
  • At this operating point the engine returns 10.2 value for available groove area.

How this compares with the baseline

  • Against the tool's baseline example, where seal cross-section area sits at 7.07 mm² and the headline result is 69.31 %, this scenario comes in 155% above the baseline at 176 %.
  • A figure at this level is achievable when seal cross-section area is genuinely sustained, not just peaked for a shift. Fill alone does not account for thermal swell, fluid absorption, or compression set; a gland that passes on area can still overfill in service after the seal swells.

Results at a glance

  • Seal groove fill: 176 % (headline result)
  • Seal-to-groove area ratio: 1.76 value
  • Percent conversion factor: 100 x
  • Available groove area: 10.2 value

Run it with your numbers

  • Every input above is editable in the live Seal Groove Fill calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.