Refractories, Furnace Linings & Foundry Consumables worked example

Cure Time at 7.2% schedule allowance for ramp and hold margin: a worked example

Suppose schedule allowance for ramp and hold margin falls to 7.2%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Cure Time estimates how many hours a freshly placed refractory castable needs to develop its hydraulic bond before you can begin heat-up.

The inputs for this scenario

  • Total lining thickness to cure (equivalent work): 120 units (held at the documented default)
  • Cure progression rate at holding conditions: 12 units / hr (held at the documented default)
  • Schedule allowance for ramp and hold margin: 7.2 % (the input this scenario stresses; the baseline uses 10)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base cure time time = required work รท processing rate.
  • Adjusted run time works out to 10.72 hr at these inputs, and this is the headline figure for the scenario.
  • Base run time works out to 10 hr at these inputs.
  • Allowance applied works out to 7.2 % at these inputs.
  • Process rate works out to 12 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where schedule allowance for ramp and hold margin sits at 10% and the headline result is 11 hr, this scenario comes in 2.55% below the baseline at 10.72 hr.
  • It computes cure hours by dividing the equivalent cure workload by the cure rate at holding conditions, then adds a schedule allowance for margin. 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

  • Adjusted run time: 10.72 hr (headline result)
  • Base run time: 10 hr
  • Allowance applied: 7.2 %
  • Process rate: 12 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Cure Time calculator, set schedule allowance for ramp and hold margin to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.