TPO Foam vs XPP
Polymer · grade comparison
TPO Foam and XPP are both polymer grades. XPP is the stronger of the two: tensile strength 0.65 MPa (0.0943 ksi) against 0.35 MPa (0.0508 ksi) for TPO Foam, about 86% more. In exchange, TPO Foam is the more ductile: elongation 150% versus 25% for XPP. TPO Foam is lighter (0.05 g/cm³ vs 0.06 g/cm³ for XPP) and XPP is stiffer (0.02 GPa vs 0 GPa).
TPO FoamChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
XPPChoose it when strength drives the design.
TPO Foam vs XPP: 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.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Compressive Modulus
Hardness, Shore A
Tear Strength
Compression Set (22 h, 70 °C)
Shear Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Physical
Density and transition temperatures.
Density
Melting Temperature (Tm)
Glass Transition (Tg)
Water Absorption (Saturation)
Same in both: Water Absorption (24 h) 0.5%
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Max Service Temperature (short-term)
Same in both: Thermal Conductivity 0.04 W/m·K0.02 BTU/hr·ft·°F · Specific Heat Capacity 1,900 J/kg·K0.45 BTU/lb·°F · Limiting Oxygen Index 18%
Electrical
Conductivity and insulation.
Dielectric Constant (1 MHz)
Surface Resistivity
Same in both: Electrical Resistivity 1×10¹³ Ω·m3.94×10²⁰ µΩ·in · Dissipation Factor (1 MHz) 3×10⁻⁴ · Volume Resistivity 1×10¹⁵ Ω·cm
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
UV / Weathering Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Melt Flow Rate
Mold Temperature (typ.)
Same in both: Machinability 60 / 100 · Weldability 70 / 100 · Formability (cold) 85 / 100 · Processing Melt Temperature (typ.) 190°C374 °F
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Diffusivity
Same in both: 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 | TPO Foam | XPP |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
TPO Foam vs XPP — frequently asked
Is XPP stronger than TPO Foam?
Yes. XPP has a typical tensile strength of 0.65 MPa (0.0943 ksi) against 0.35 MPa (0.0508 ksi) for TPO Foam — about 86% more.
Which is cheaper, TPO Foam or XPP?
Both sit in the same relative cost tier ($$$, premium); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose TPO Foam over XPP?
Pick TPO Foam when the part is bent, formed or impact-loaded, or when weight is the constraint. Pick XPP when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in TPO Foam and XPP 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.