PMI Foam vs PVC Foam (Rigid, Structural Core)
Polymer · grade comparison
PMI Foam and PVC Foam (Rigid, Structural Core) are both polymer grades. PVC Foam (Rigid, Structural Core) is the stronger of the two: tensile strength 3 MPa (0.363 ksi) against 2 MPa (0.319 ksi) for PMI Foam, about 14% more. PVC Foam (Rigid, Structural Core) is the more ductile: elongation 10% versus 3% for PMI Foam. PMI Foam is lighter (0.08 g/cm³ vs 0.08 g/cm³ for PVC Foam (Rigid, Structural Core)) and PMI Foam runs hotter in service (180°C vs 70°C continuous).
PMI FoamChoose it when weight is the constraint, or when the part sees heat.
PVC Foam (Rigid, Structural Core)Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
PMI Foam vs PVC Foam (Rigid, Structural Core): propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
PMI FoamPVC Foam (Rigid, Structural Core)
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Flexural Strength
Shear Strength
Yield Strength (0.2% offset)
Flexural Modulus
Fracture Toughness (K_IC)
Same in both: Poisson's Ratio 0.3 · Compressive Modulus 0.09 GPa0.01 Msi
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Limiting Oxygen Index
Max Service Temperature (short-term)
Heat Deflection Temp. @ 0.45 MPa
Electrical
Conductivity and insulation.
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
UV / Weathering Resistance
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Polishability
Weldability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Same in both: Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Same in both: Specific Stiffness (E / density) 1.2 MN·m/kg · Thermal Diffusivity 0.3 mm²/s · Thermal Shock Resistance Index 0
Strength versus weight
Yield strength against density for every polymer grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | PMI Foam | PVC Foam (Rigid, Structural Core) |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
PMI Foam vs PVC Foam (Rigid, Structural Core) — frequently asked
Is PVC Foam (Rigid, Structural Core) stronger than PMI Foam?
Yes. PVC Foam (Rigid, Structural Core) has a typical tensile strength of 3 MPa (0.363 ksi) against 2 MPa (0.319 ksi) for PMI Foam — about 14% more.
Which is cheaper, PMI Foam or PVC Foam (Rigid, Structural Core)?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, PMI Foam or PVC Foam (Rigid, Structural Core)?
PVC Foam (Rigid, Structural Core), by a small margin. Both rate excellent for machinability — 90/100 against 85/100 for PMI Foam.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PMI Foam and PVC Foam (Rigid, Structural Core) side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.