Coatings, Inks & Specialty Chemical Production worked example

Pigment Dispersion Time at 25% hegman grind check and viscosity adjustment allowance: a worked example

Suppose hegman grind check and viscosity adjustment allowance falls to 25%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate pigment dispersion time from dispersion workload, mill or disperser rate, and allowance for grind checks and viscosity adjustments.

The inputs for this scenario

  • Pigment slurry batch weight: 2,200 lb (held at the documented default)
  • Mill or high-speed disperser throughput: 28 lb / min (held at the documented default)
  • Hegman grind check and viscosity adjustment allowance: 25 % (the input this scenario stresses; the baseline uses 35)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base pigment dispersion time = pigment dispersion workload รท mill or disperser processing rate.
  • estimated pigment dispersion time works out to 98.21 hr at these inputs, and this is the headline figure for the scenario.
  • base pigment dispersion time works out to 78.57 hr at these inputs.
  • Hegman grind and adjustment allowance works out to 25 % at these inputs.
  • mill or disperser processing rate works out to 28 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where hegman grind check and viscosity adjustment allowance sits at 35% and the headline result is 106 hr, this scenario comes in 7.41% below the baseline at 98.21 hr.
  • It computes dispersion hours by dividing the pigment slurry weight by mill or disperser throughput, then adding a grind-check and adjustment allowance for the iterative fineness passes. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • estimated pigment dispersion time: 98.21 hr (headline result)
  • base pigment dispersion time: 78.57 hr
  • Hegman grind and adjustment allowance: 25 %
  • mill or disperser processing rate: 28 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Pigment Dispersion Time calculator, set hegman grind check and viscosity adjustment allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.