Rubber, Tires, Foam & Elastomer Manufacturing worked example

Compound Inventory Days with compound consumed per production day of 3,000 units / day: a worked example

This scenario runs the compound inventory days calculation on the strong side: compound consumed per production day of 3,000 units / day, with every other input held at its documented default. Use it when compound inventory days in rubber, tires, foam and elastomer manufacturing is being sized for a buffer or safety stock review.

The inputs for this scenario

  • Compound consumed per production day: 3,000 units / day (raised for this scenario; the documented default is 1,200)
  • Compound supplier lead time: 85 days (unchanged)
  • Compound safety stock on hand: 1.1 units (unchanged)

Working through the calculation

  • Applying the documented formula (Compound inventory days cycle stock = compound inventory days daily usage × compound inventory days lead time) to the inputs above produces each figure below.
  • At this operating point the engine returns 32.09 days for protected days of supply, the number this scenario is built around.
  • At this operating point the engine returns 35.29 days for unprotected days.
  • At this operating point the engine returns 3,000 pieces for inventory.
  • At this operating point the engine returns 85 pieces / day for daily usage.

How this compares with the baseline

  • Against the tool's baseline example, where compound consumed per production day sits at 1,200 units / day and the headline result is 12.83 days, this scenario comes in 150% above the baseline at 32.09 days.
  • Use it when setting reorder points for mixed compounds, sizing the mixing-room WIP buffer, or stress-testing supply before a plant shutdown or supplier changeover. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Protected days of supply: 32.09 days (headline result)
  • Unprotected days: 35.29 days
  • Inventory: 3,000 pieces
  • Daily usage: 85 pieces / day

Run it with your numbers

  • Every input above is editable in the live Compound Inventory Days calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.