Rotational Molding worked example

Scrap/Rework Cost at 92% share of cost not recovered as regrind: a worked example in rotational molding

What does the result look like when share of cost not recovered as regrind reaches 92%? The full calculation is worked below with real intermediate numbers. Use it when scrap/rework cost in rotational molding is being put through a rotational molding weighted-cost review.

The inputs for this scenario

  • Scrapped or reworked parts in the run: 100 units (unchanged)
  • Fully burdened cost per scrapped part: 45 $ / unit (unchanged)
  • Share of cost not recovered as regrind: 92 % (raised for this scenario; the documented default is 80)
  • Fixed rework setup and handling cost: 250 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Scrap/Rework Cost cost = quantity × rate × capture factor + fixed cost) to the inputs above produces each figure below.
  • At this operating point the engine returns 4,390 $ for weighted cost, the number this scenario is built around.
  • At this operating point the engine returns 43.9 $ / piece for per piece value.
  • At this operating point the engine returns 4,140 $ for captured value.
  • At this operating point the engine returns 250 $ for fixed adjustment.

How this compares with the baseline

  • Against the tool's baseline example, where share of cost not recovered as regrind sits at 80% and the headline result is 3,850 $, this scenario comes in 14.03% above the baseline at 4,390 $.
  • A figure at this level is achievable when share of cost not recovered as regrind is genuinely sustained, not just peaked for a shift. The capture factor is an estimate of unrecoverable cost, not a precise scrap valuation; it doesn't distinguish scrap that becomes usable regrind from parts that must be landfilled.

Results at a glance

  • Weighted cost: 4,390 $ (headline result)
  • Per piece value: 43.9 $ / piece
  • Captured value: 4,140 $
  • Fixed adjustment: 250 $

Run it with your numbers

  • Every input above is editable in the live Scrap/Rework Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.