PUR/PIR Board vs Rebond Foam
Polymer · grade comparison
PUR/PIR Board and Rebond Foam are both polymer grades. PUR/PIR Board is the stronger of the two: tensile strength 0.28 MPa (0.0406 ksi) against 0.15 MPa (0.0218 ksi) for Rebond Foam, about 87% more. In exchange, Rebond Foam is the more ductile: elongation 60% versus 8% for PUR/PIR Board. PUR/PIR Board is lighter (0.03 g/cm³ vs 0.08 g/cm³ for Rebond Foam) and PUR/PIR Board is stiffer (0.01 GPa vs 8×10⁻⁴ GPa). On the shop floor, PUR/PIR Board machines more easily (excellent vs very good), Rebond Foam welds better (poor vs not recommended), and Rebond Foam sits in a lower cost tier (standard, $$) than PUR/PIR Board (premium, $$$).
PUR/PIR BoardChoose it when strength drives the design, or when weight is the constraint.
Rebond FoamChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
PUR/PIR Board vs Rebond Foam: 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
Shear Modulus
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Compressive Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Compression Set (22 h, 70 °C)
Yield Strength (0.2% offset)
Hardness, Shore A
Tear Strength
Same in both: Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
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
Same in both: Max Service Temperature (short-term) 120°C248 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Constant (1 MHz)
Volume Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 20 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
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
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 | PUR/PIR Board | Rebond Foam |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
PUR/PIR Board vs Rebond Foam — frequently asked
Is PUR/PIR Board stronger than Rebond Foam?
Yes. PUR/PIR Board has a typical tensile strength of 0.28 MPa (0.0406 ksi) against 0.15 MPa (0.0218 ksi) for Rebond Foam — about 87% more.
Which is cheaper, PUR/PIR Board or Rebond Foam?
Rebond Foam is the lower-cost material: it sits in the standard tier ($$) while PUR/PIR Board is premium ($$$). 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, PUR/PIR Board or Rebond Foam?
PUR/PIR Board. Its machinability rates excellent (95/100) against very good (80/100) for Rebond Foam; for welding the order is Rebond Foam first (poor, 15/100) then PUR/PIR Board (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in PUR/PIR Board and Rebond Foam 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.