Marine, Shipbuilding & Boat Manufacturing worked example

Resin Infusion Material Estimate at 63% target fiber volume fraction: a worked example

What does the result look like when target fiber volume fraction reaches 63%? The full calculation is worked below with real intermediate numbers. Use it before ordering resin for a vacuum infusion hull, deck, or structural part to avoid short pours or excessive leftover material.

The inputs for this scenario

  • Total dry reinforcement weight: 120 kg (unchanged)
  • Target fiber volume fraction: 63 % (raised for this scenario; the documented default is 55)
  • Resin waste allowance: 10 % (unchanged)

Working through the calculation

  • Applying the documented formula (Net resin required = dry reinforcement weight x ((100 - fiber volume fraction) / fiber volume fraction) x (resin density / fiber density)) to the inputs above produces each figure below.
  • At this operating point the engine returns 75,600 kg for total resin to order, the number this scenario is built around.
  • At this operating point the engine returns 7,560 kg for net resin required (no waste).
  • At this operating point the engine returns 68,040 kg for resin waste allowance.
  • At this operating point the engine returns 10 % for effective resin utilization.

How this compares with the baseline

  • Against the tool's baseline example, where target fiber volume fraction sits at 55% and the headline result is 66,000 kg, this scenario comes in 14.55% above the baseline at 75,600 kg.
  • A figure at this level is achievable when target fiber volume fraction is genuinely sustained, not just peaked for a shift. Fiber volume fraction is a target, not a guarantee; real infusions vary with bag pressure, flow media, and core absorption, so the as-built ratio can drift from the entered value.

Results at a glance

  • Total resin to order: 75,600 kg (headline result)
  • Net resin required (no waste): 7,560 kg
  • Resin waste allowance: 68,040 kg
  • Effective resin utilization: 10 %

Run it with your numbers

  • Every input above is editable in the live Resin Infusion Material Estimate calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.