Rubber, Tires, Foam & Elastomer Manufacturing worked example

Seal Molding Cost at 69% first-pass yield: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop first-pass yield to 69%, then walk the calculation through step by step. Estimate the cost to mold rubber seals or O-rings, combining per-piece molded cost, first-pass yield and press setup.

The inputs for this scenario

  • Seals Molded: 5,000 pieces (held at the documented default)
  • Molded Cost per Seal: 0.42 $/piece (held at the documented default)
  • First-Pass Yield: 69 % (the input this scenario stresses; the baseline uses 96)
  • Mold Setup & Cure Charge: 320 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Seal molding cost = seals x cost per seal x first-pass yield% + setup/cure charge.
  • Total seal molding cost works out to 1,769 $ at these inputs, and this is the headline figure for the scenario.
  • Seal molding cost per unit works out to 0.35 $ / piece at these inputs.
  • Variable seal molding cost works out to 1,449 $ at these inputs.
  • Fixed seal molding cost adder works out to 320 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where first-pass yield sits at 96% and the headline result is 2,336 $, this scenario comes in 24.27% below the baseline at 1,769 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to first-pass yield, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. Treating yield as a simple multiplier assumes rejected seals still consume their full molded cost; it does not separately model rework, regrind recovery, or scrap disposal.

Results at a glance

  • Total seal molding cost: 1,769 $ (headline result)
  • Seal molding cost per unit: 0.35 $ / piece
  • Variable seal molding cost: 1,449 $
  • Fixed seal molding cost adder: 320 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Seal Molding Cost calculator, set first-pass yield to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.