Adhesives, Sealants & Industrial Bonding worked example

Bond Line Thickness Control at 99% spacer or fixture control: a worked example

Push spacer or fixture control up to 99% and the picture changes. This example computes every intermediate figure at that operating point. an applications engineer needs to confirm that a bond-line thickness target is practical for the joint design

The inputs for this scenario

  • Target glue-line thickness: 0.25 mm (unchanged)
  • Bonded joint area: 180 cm² (unchanged)
  • Spacer or fixture control: 99 % (raised for this scenario; the documented default is 92)
  • Usable wet-out yield: 96 % (unchanged)

Working through the calculation

  • Applying the documented formula (Theoretical thickness-area volume = target glue-line thickness × bonded joint area) to the inputs above produces each figure below.
  • At this operating point the engine returns 42.77 mm·cm² for controlled bond-line volume index, the number this scenario is built around.
  • At this operating point the engine returns 45 mm·cm² for theoretical thickness-area volume.
  • At this operating point the engine returns 0.45 mm·cm² for thickness control loss.
  • At this operating point the engine returns 1.78 mm·cm² for wet-out yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where spacer or fixture control sits at 92% and the headline result is 39.74 mm·cm², this scenario comes in 7.61% above the baseline at 42.77 mm·cm².
  • It computes a theoretical thickness-area volume from glue-line thickness and joint area, then derates it by spacer/fixture control and usable wet-out yield to give a controlled volume index. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Controlled bond-line volume index: 42.77 mm·cm² (headline result)
  • Theoretical thickness-area volume: 45 mm·cm²
  • Thickness control loss: 0.45 mm·cm²
  • Wet-out yield loss: 1.78 mm·cm²

Run it with your numbers

  • Every input above is editable in the live Bond Line Thickness Control calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.