Plastics Extrusion - Pipe, Film & Profile worked example

Resin Usage Per Foot at 99% expected material yield: a worked example

Push expected material yield up to 99% and the picture changes. This example computes every intermediate figure at that operating point. Use it before a pipe, film, sheet, or profile run when resin buyers and schedulers need enough material without overbuying.

The inputs for this scenario

  • Planned finished length: 5,000 ft (unchanged)
  • Resin use per foot: 0.08 lb / ft (unchanged)
  • Expected material yield: 99 % (raised for this scenario; the documented default is 92)

Working through the calculation

  • Applying the documented formula (Required resin = planned finished length × resin use per foot ÷ expected material yield) to the inputs above produces each figure below.
  • At this operating point the engine returns 404 lb for required resin to stage, the number this scenario is built around.
  • At this operating point the engine returns 400 lb for theoretical finished resin.
  • At this operating point the engine returns 4.04 lb for scrap and yield allowance.
  • At this operating point the engine returns 99 % for expected material yield.

How this compares with the baseline

  • Against the tool's baseline example, where expected material yield sits at 92% and the headline result is 435 lb, this scenario comes in 7.07% below the baseline at 404 lb.
  • It computes total resin to stage by multiplying finished length by resin per foot and dividing by expected yield, and it separates the theoretical resin from the scrap allowance. 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

  • Required resin to stage: 404 lb (headline result)
  • Theoretical finished resin: 400 lb
  • Scrap and yield allowance: 4.04 lb
  • Expected material yield: 99 %

Run it with your numbers

  • Every input above is editable in the live Resin Usage Per Foot calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.