Rotational Molding worked example
Powder Charge Weight with part surface area of 250 in²: a worked example
What does the result look like when part surface area reaches 250 in²? The full calculation is worked below with real intermediate numbers. Use it when powder charge weight in rotational molding needs a few factors combined into one defensible number for rotational molding.
The inputs for this scenario
- Part surface area: 250 in² (raised for this scenario; the documented default is 100)
- Target wall thickness: 4 mm (unchanged)
- Powder density conversion factor: 0.01 x (unchanged)
- Powder yield / scrap allowance multiplier: 1 x (unchanged)
Working through the calculation
- Applying the documented formula (Powder Charge Weight = first factor × second factor × conversion factor × process multiplier) to the inputs above produces each figure below.
- At this operating point the engine returns 5 lb for result, the number this scenario is built around.
- At this operating point the engine returns 5 value for base product.
- At this operating point the engine returns 1 x for multiplier.
- At this operating point the engine returns 1,000 value for factor a x b.
How this compares with the baseline
- Against the tool's baseline example, where part surface area sits at 100 in² and the headline result is 2 lb, this scenario comes in 150% above the baseline at 5 lb.
- A figure at this level is achievable when part surface area is genuinely sustained, not just peaked for a shift. It assumes uniform wall thickness and even powder distribution; deep draws, sharp corners, and bridging can leave localized thin or thick spots that a single average charge cannot correct.
Results at a glance
- Result: 5 lb (headline result)
- Base product: 5 value
- Multiplier: 1 x
- Factor A x B: 1,000 value
Run it with your numbers
- Every input above is editable in the live Powder Charge Weight calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.