MPR vs TPA (PEBA)
Polymer · grade comparison
MPR and TPA (PEBA) are both polymer grades. TPA (PEBA) is the stronger of the two: tensile strength 52 MPa (7.54 ksi) against 9 MPa (1.23 ksi) for MPR, about 6.1 times as much. TPA (PEBA) is the more ductile: elongation 430% versus 300% for MPR, and TPA (PEBA) is harder (60 Shore D vs 24 Shore D). TPA (PEBA) is lighter (1.01 g/cm³ vs 1.2 g/cm³ for MPR) and TPA (PEBA) is stiffer (0.22 GPa vs 0.01 GPa). On the shop floor, MPR sits in a lower cost tier (premium, $$$) than TPA (PEBA) (high, $$$$).
MPRChoose it when the part sees heat, or when cost is the deciding factor.
TPA (PEBA)Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
MPR vs TPA (PEBA): 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
Flexural Modulus
Hardness, Shore A
Hardness, Shore D
Tear Strength
Compression Set (22 h, 70 °C)
Yield Strength (0.2% offset)
Izod Impact, Notched
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Melting Temperature (Tm)
Water Absorption (Saturation)
Same in both: Water Absorption (24 h) 0.6%
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)
Limiting Oxygen Index
Max Service Temperature (short-term)
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Vicat Softening Point (B50)
Same in both: Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Dielectric Strength
Dielectric Constant (1 MHz)
Surface Resistivity
Same in both: Electrical Resistivity 1×10¹⁰ Ω·m3.94×10¹⁷ µΩ·in · Volume Resistivity 1×10¹² 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.
Machinability
Mold Shrinkage
Processing Melt Temperature (typ.)
Polishability
Melt Flow Rate
Same in both: Weldability 75 / 100 · Formability (cold) 85 / 100 · Mold Temperature (typ.) 30°C86 °F
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Embodied Water
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Shock Resistance Index
Same in both: Thermal Diffusivity 0.1 mm²/s
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 | MPR | TPA (PEBA) |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
MPR vs TPA (PEBA) — frequently asked
Is TPA (PEBA) stronger than MPR?
Yes. TPA (PEBA) has a typical tensile strength of 52 MPa (7.54 ksi) against 9 MPa (1.23 ksi) for MPR — about 6.1 times as much.
Which is cheaper, MPR or TPA (PEBA)?
MPR is the lower-cost material: it sits in the premium tier ($$$) while TPA (PEBA) is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, MPR or TPA (PEBA)?
MPR, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for TPA (PEBA).
Ready to make it?
Upload a CAD file and FabDigit prices the part in MPR and TPA (PEBA) 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.