Pressure Pot Sizing Calculator
Determine the minimum pressure pot diameter, height, and PSI needed for bubble-free resin castings based on your largest mold size.
Inputs
in
in
Results
Min Pot Diameter
10 in
≈ 3 credit cards
Recommended PSI
50 PSI
Min Pot Height7 in
Recommended Pot Size2.5 gal
Casting Volume62.66 oz
Resin TypeEpoxy Resin
How to Use This Calculator
- Enter the maximum diameter of the casting or object you need to pressurize in inches.
- Enter the maximum height of the casting in inches.
- Select the resin type (polyester, epoxy, or urethane) — each has a different recommended working pressure.
- Read the minimum pressure pot diameter and the PSI needed to eliminate bubbles effectively.
- Use the safety factor output to confirm your pot's rated pressure exceeds the required PSI.
How the result changes with Max Casting Diameter
| Max Casting Diameter | Min Pot Diameter | Recommended PSI |
|---|---|---|
| 3.3 | 7.3 in | 50 PSI |
| 9.05 | 13.1 in | 50 PSI |
| 16 | 20 in | 50 PSI |
| 22 | 26 in | 50 PSI |
What each input means
- Max Casting Diameter
- The widest dimension of your largest casting or mold. The pressure pot must fit the entire mold inside.
- Max Casting Height
- The tallest dimension of your largest casting or mold, including the mold box walls.
- Resin Type
- Different resins have different recommended pressure levels to compress bubbles below visible size.
How this is calculated
Worked example, using the default values
- Identify Input ParametersMax Casting Diameter = 6, Max Casting Height = 4, Resin Type = 2 = 3 input(s) provided
- Calculate Min Pot DiameterMin Pot Diameter10 = 10
- Calculate Recommended PSIRecommended PSI = resin.psi50 = 50
- Calculate Min Pot HeightMin Pot Height7 = 7
- Calculate Recommended Pot SizeRecommended Pot Size2.5 = 2.5
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