Vacuum Casting Mold Life & Cost Calculator
Estimate how many silicone molds you need for vacuum casting. Compare production costs for 20, 50, 100, or 200 polyurethane parts using adjustable mold life, cavity count, master pattern cost, and PU casting expenses.
Urethane Casting Cost Calculator: Project Inputs
Estimate the number of silicone molds and the total cost to produce a batch of polyurethane (PU) vacuum cast parts. All mold-life and pricing inputs are editable.
Compare standard batch sizes or enter a custom order quantity:
Silicone Mold Life Scenarios
Mold life means usable casting cycles per silicone mold, not the total number of parts. Lower life produces a higher mold count and cost.
Master Pattern, Mold and PU Casting Costs
Enter all costs in the same currency. Set master cost to zero if an approved master is already available. The PU casting amount should include resin, normal consumables and casting labor; do not add those costs twice. The currency selector does not perform exchange-rate conversion.
Vacuum Casting Mold Life and Cost Results
Expected Cost Breakdown
Mold Life Sensitivity: Conservative vs Expected vs Optimistic
All three cases use the same order quantity, number of cavities and casting costs. Only the usable casting cycles per silicone mold change. The displayed cost range therefore represents mold-life uncertainty only, not all possible variations in material prices or labor rates.
| Mold life scenario | Casts per mold | Silicone molds | Mold fabrication + setup | Total batch cost | Cost per good part |
|---|---|---|---|---|---|
| Calculation results appear here. | |||||
Quantity Comparison: 20, 50, 100 and 200 Vacuum Cast Parts
Compare batch costs and the number of silicone molds required at typical prototype and bridge-production quantities. Each line recalculates mold sets from the expected usable mold life; the selected batch is highlighted. For a larger order, evaluate whether repeated silicone tooling remains suitable.
| Required good parts | Molds at expected life | Cost per part | Expected total | Total with optimistic life | Total with conservative life |
|---|---|---|---|---|---|
| Calculation results appear here. | |||||
How the Vacuum Casting Cost Calculator Works
Required casting cycles = round up [required good parts ÷ (cavities × expected acceptable yield)]. Number of silicone molds = round up [required casting cycles ÷ usable cycles per mold]. A partly filled last casting cycle is conservatively charged as a complete cycle for every active cavity.
Estimated batch cost = one-time master pattern + (silicone mold fabrication + preparation) × molds needed + attempted cast parts × PU casting cost + requested good parts × finishing and inspection cost. Estimated unit cost = estimated batch cost ÷ requested good parts. Both tooling replacement and cast cycles are calculated as whole numbers.
Published mold-life examples vary with silicone grade, PU chemistry, mold geometry, release method, temperature, texture and part acceptance criteria. The editable 15 to 25 cycle range is an illustrative starting point, not a universal mold-life guarantee. Use supplier-validated cycle limits whenever available.
For project-specific process and tooling considerations, review our vacuum casting manufacturing services and confirm expected mold life with the production team.
Vacuum Casting Mold Life and PU Cost: Common Questions
How many silicone molds do I need for 100 vacuum cast parts?
At one cavity per mold, no rejected parts and 20 usable casting cycles per mold, five molds are required. Change cavities, accepted yield and mold life to reflect the actual process.
How long does a silicone mold last in urethane casting?
There is no guaranteed universal life. Published supplier examples vary, often describing approximately 15 to 25 casts per mold; some formulations and geometries permit more. Use the three editable life assumptions to see the cost difference.
Does a two-cavity mold produce twice as many good parts?
Two acceptable parts can be produced per complete casting cycle in a two-cavity mold, subject to fill quality and scrap. Mold life is measured in cycles, and the number of produced parts also depends on usable cavities and yield.
Why does urethane casting cost per part decrease with quantity?
The one-time master pattern cost is distributed over more good parts. However, each additional silicone mold adds a stepwise tooling expense, and casting labor and PU resin costs grow with production volume.
Are the displayed costs a supplier quotation?
No. These are indicative scenarios using user-editable assumptions. A production quotation needs CAD, physical dimensions, PU grade, cosmetic requirements, mold construction, expected acceptance rate, inspection plan and delivery requirements.
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