Marine, Shipbuilding & Boat Manufacturing worked example

Resin Infusion Material Estimate at 40% target fiber volume fraction: a worked example

This worked example runs the resin infusion material estimate numbers for a tougher week than the baseline: 40% target fiber volume fraction instead of the typical 55%. Calculate total resin quantity needed for a vacuum infusion layup based on dry fabric weight, fiber volume fraction target, and waste allowance for feed lines, mixing, and bleed-off.

The inputs for this scenario

  • Total dry reinforcement weight: 120 kg (held at the documented default)
  • Target fiber volume fraction: 40 % (the input this scenario stresses; the baseline uses 55)
  • Resin waste allowance: 10 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Net resin required = dry reinforcement weight x ((100 - fiber volume fraction) / fiber volume fraction) x (resin density / fiber density).
  • Total resin to order works out to 48,000 kg at these inputs, and this is the headline figure for the scenario.
  • Net resin required (no waste) works out to 4,800 kg at these inputs.
  • Resin waste allowance works out to 43,200 kg at these inputs.
  • Effective resin utilization works out to 10 % at these inputs.

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 27.27% below the baseline at 48,000 kg.
  • Use it when planning a vacuum-infusion shot or buying resin for a hull, deck, or structural part before a one-shot infusion. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Total resin to order: 48,000 kg (headline result)
  • Net resin required (no waste): 4,800 kg
  • Resin waste allowance: 43,200 kg
  • Effective resin utilization: 10 %

Run it with your numbers

  • To rerun this with your own numbers, open the live Resin Infusion Material Estimate calculator, set target fiber volume fraction to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.