Composites, Fiberglass & Advanced Materials worked example

Prepreg Scrap Cost at 72% share of scrap charged to this job: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop share of scrap charged to this job to 72%, then walk the calculation through step by step. Estimate the cost of prepreg scrap from cutting, nesting, trim, expired material, or layup damage.

The inputs for this scenario

  • Prepreg material scrapped on this job: 42 lb (held at the documented default)
  • Delivered prepreg cost per pound: 84 $ / lb (held at the documented default)
  • Share of scrap charged to this job: 72 % (the input this scenario stresses; the baseline uses 100)
  • Scrap handling and disposal cost: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable prepreg scrap cost = scrapped prepreg weight × prepreg material cost × scrap cost scope included.
  • total prepreg scrap cost works out to 2,790 $ at these inputs, and this is the headline figure for the scenario.
  • prepreg scrap cost per part or job works out to 66.43 $ / piece at these inputs.
  • variable prepreg scrap cost works out to 2,540 $ at these inputs.
  • scrap handling and disposition cost works out to 250 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where share of scrap charged to this job sits at 100% and the headline result is 3,778 $, this scenario comes in 26.15% below the baseline at 2,790 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to share of scrap charged to this job, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It values scrap at delivered material cost only; it does not capture the lost labor and machine time already invested in a part that is scrapped after layup or cure.

Results at a glance

  • total prepreg scrap cost: 2,790 $ (headline result)
  • prepreg scrap cost per part or job: 66.43 $ / piece
  • variable prepreg scrap cost: 2,540 $
  • scrap handling and disposition cost: 250 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Prepreg Scrap Cost calculator, set share of scrap charged to this job to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.