MPR vs TPU-Caprolactone
Polymer · grade comparison
MPR and TPU-Caprolactone are both polymer grades. TPU-Caprolactone is the stronger of the two: tensile strength 45 MPa (6.53 ksi) against 9 MPa (1.23 ksi) for MPR, about 5.3 times as much. TPU-Caprolactone is the more ductile: elongation 550% versus 300% for MPR, and TPU-Caprolactone is harder (35 Shore D vs 24 Shore D). TPU-Caprolactone is stiffer (0.03 GPa vs 0.01 GPa) and MPR runs hotter in service (120°C vs 85°C continuous). On the shop floor, TPU-Caprolactone welds better (excellent vs very good).
MPRChoose it when the part sees heat.
TPU-CaprolactoneChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
MPR vs TPU-Caprolactone: 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
Tensile Strength (Ultimate)
Elongation at Break
Flexural Modulus
Hardness, Shore A
Hardness, Shore D
Tear Strength
Same in both: Poisson's Ratio 0.48 · Compression Set (22 h, 70 °C) 30%
Physical
Density and transition temperatures.
Glass Transition (Tg)
Melting Temperature (Tm)
Water Absorption (Saturation)
Same in both: Density 1.2 g/cm³0.04 lb/in³ · Water Absorption (24 h) 0.6%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Limiting Oxygen Index
Max Service Temperature (short-term)
Vicat Softening Point (B50)
Same in both: Specific Heat Capacity 1,700 J/kg·K0.41 BTU/lb·°F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Surface Resistivity
Same in both: 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.
Weldability
Formability (cold)
Mold Shrinkage
Processing Melt Temperature (typ.)
Polishability
Melt Flow Rate
Same in both: Machinability 30 / 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)
Thermal Shock Resistance Index
Same in both: Specific Stiffness (E / density) 0 MN·m/kg · 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 | TPU-Caprolactone |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
MPR vs TPU-Caprolactone — frequently asked
Is TPU-Caprolactone stronger than MPR?
Yes. TPU-Caprolactone has a typical tensile strength of 45 MPa (6.53 ksi) against 9 MPa (1.23 ksi) for MPR — about 5.3 times as much.
Which is cheaper, MPR or TPU-Caprolactone?
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.
Which welds better, MPR or TPU-Caprolactone?
TPU-Caprolactone. Its weldability rates excellent (85/100) against very good (75/100) for MPR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in MPR and TPU-Caprolactone 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.