HR Foam vs Rebond Foam
Polymer · grade comparison
HR Foam and Rebond Foam are both polymer grades. Rebond Foam is the stronger of the two: tensile strength 0.15 MPa (0.0218 ksi) against 0.13 MPa (0.0189 ksi) for HR Foam, about 15% more. In exchange, HR Foam is the more ductile: elongation 130% versus 60% for Rebond Foam. HR Foam is lighter (0.05 g/cm³ vs 0.08 g/cm³ for Rebond Foam) and Rebond Foam is stiffer (8×10⁻⁴ GPa vs 2×10⁻⁵ GPa). On the shop floor, HR Foam welds better (fair vs poor).
HR FoamChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
Rebond FoamChoose it when strength drives the design.
HR Foam 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
Poisson's Ratio
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Compressive Modulus
Compression Set (22 h, 70 °C)
Yield Strength (0.2% offset)
Shear Strength
Hardness, Shore A
Same in both: Tear Strength 0.4 kN/m2.3 lbf/in
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Min Service Temperature
Limiting Oxygen Index
Same in both: Specific Heat Capacity 1,500 J/kg·K0.36 BTU/lb·°F · Max Service Temperature (short-term) 120°C248 °F
Electrical
Conductivity and insulation.
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
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)
Thermal Diffusivity
Same in both: Specific Stiffness (E / density) 0 MN·m/kg
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 | HR Foam | Rebond Foam |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
HR Foam vs Rebond Foam — frequently asked
Is Rebond Foam stronger than HR Foam?
Yes. Rebond Foam has a typical tensile strength of 0.15 MPa (0.0218 ksi) against 0.13 MPa (0.0189 ksi) for HR Foam — about 15% more.
Which is cheaper, HR Foam or Rebond Foam?
Both sit in the same relative cost tier ($$, standard); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, HR Foam or Rebond Foam?
HR Foam. Its machinability rates excellent (85/100) against very good (80/100) for Rebond Foam; for welding the order is HR Foam first (fair, 40/100) then Rebond Foam (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in HR Foam 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.