Paint, Resin & Polymer Compounding worked example

Batch Blend Time at 14% charging, grind, and letdown time allowance: a worked example

This worked example runs the batch blend time numbers for a tougher week than the baseline: 14% charging, grind, and letdown time allowance instead of the typical 20%. Estimate how long a paint or resin batch needs on the disperser from batch size, mixer throughput, and an allowance for charging, grind, and letdown.

The inputs for this scenario

  • Batch size to blend: 1,000 gal (held at the documented default)
  • Disperser throughput rate: 12 gal / min (held at the documented default)
  • Charging, grind, and letdown time allowance: 14 % (the input this scenario stresses; the baseline uses 20)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base blend time = batch size / disperser throughput rate.
  • Required blend time works out to 95 hr at these inputs, and this is the headline figure for the scenario.
  • Base blend time works out to 83.33 hr at these inputs.
  • Charging, grind, and letdown allowance works out to 14 % at these inputs.
  • Disperser throughput rate works out to 12 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where charging, grind, and letdown time allowance sits at 20% and the headline result is 100 hr, this scenario comes in 5% below the baseline at 95 hr.
  • Use it when scheduling disperser or mixer time, quoting batch lead times, or checking whether a new batch size fits the available shift window. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Required blend time: 95 hr (headline result)
  • Base blend time: 83.33 hr
  • Charging, grind, and letdown allowance: 14 %
  • Disperser throughput rate: 12 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Batch Blend Time calculator, set charging, grind, and letdown time allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.