Foam, Insulation & Cushioning Products worked example

Fire Rating Test Burden at 52% conditioning, documentation, and retest allowance: a worked example

What does the result look like when conditioning, documentation, and retest allowance reaches 52%? The full calculation is worked below with real intermediate numbers. Use it for construction insulation, acoustic foam, automotive interiors, furniture cushioning, packaging foams, or laminated products that require fire-performance evidence.

The inputs for this scenario

  • Fire test specimens or submissions: 18 specimens (unchanged)
  • Fire test submissions processed per hour: 2.4 specimens / hr (unchanged)
  • Conditioning, documentation, and retest allowance: 52 % (raised for this scenario; the documented default is 45)

Working through the calculation

  • Applying the documented formula (Base fire rating test burden time = fire test specimens or submissions ÷ fire test submissions processed per hour) to the inputs above produces each figure below.
  • At this operating point the engine returns 11.4 hr for required fire rating test burden time, the number this scenario is built around.
  • At this operating point the engine returns 7.5 hr for base fire rating test burden time.
  • At this operating point the engine returns 52 % for conditioning, documentation, and retest allowance.
  • At this operating point the engine returns 2.4 specimens / hr for fire test submissions processed per hour.

How this compares with the baseline

  • Against the tool's baseline example, where conditioning, documentation, and retest allowance sits at 45% and the headline result is 10.88 hr, this scenario comes in 4.83% above the baseline at 11.4 hr.
  • A figure at this level is achievable when conditioning, documentation, and retest allowance is genuinely sustained, not just peaked for a shift. It assumes a steady throughput rate — equipment availability, chamber conditioning cycles, and retest failures can swing actual hours well beyond the allowance, so treat it as a planning baseline.

Results at a glance

  • Required fire rating test burden time: 11.4 hr (headline result)
  • Base fire rating test burden time: 7.5 hr
  • Conditioning, documentation, and retest allowance: 52 %
  • Fire test submissions processed per hour: 2.4 specimens / hr

Run it with your numbers

  • Every input above is editable in the live Fire Rating Test Burden calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.