EPS 150 vs XPS 400
Polymer · grade comparison
EPS 150 and XPS 400 are both polymer grades. XPS 400 is the stronger of the two: yield strength 0.4 MPa (0.058 ksi) against 0.15 MPa (0.0218 ksi) for EPS 150, about 167% more; tensile strength follows at 0.6 MPa (0.087 ksi) vs 0.3 MPa (0.0435 ksi). XPS 400 is the more ductile: elongation 2.5% versus 2% for EPS 150. EPS 150 is lighter (0.03 g/cm³ vs 0.04 g/cm³ for XPS 400) and XPS 400 is stiffer (0.02 GPa vs 0.01 GPa). On the shop floor, EPS 150 welds better (fair vs poor).
EPS 150Choose it when weight is the constraint, or when it will be welded.
XPS 400Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
EPS 150 vs XPS 400: 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
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Compressive Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Compression Set (22 h, 70 °C)
Physical
Density and transition temperatures.
Density
Water Absorption (24 h)
Water Absorption (Saturation)
Same in both: Glass Transition (Tg) 100°C212 °F
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)
Vicat Softening Point (B50)
Max Service Temperature (short-term)
Same in both: Min Service Temperature -50°C-58 °F · Limiting Oxygen Index 25%
Electrical
Conductivity and insulation.
Dielectric Constant (1 MHz)
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.
Machinability
Weldability
Formability (cold)
Mold Shrinkage
Processing Melt Temperature (typ.)
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)
Modulus of Resilience
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 | EPS 150 | XPS 400 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
EPS 150 vs XPS 400 — frequently asked
Is XPS 400 stronger than EPS 150?
Yes. XPS 400 has a typical yield strength of 0.4 MPa (0.058 ksi) against 0.15 MPa (0.0218 ksi) for EPS 150 — about 167% more. Tensile strength is 0.6 MPa (0.087 ksi) vs 0.3 MPa (0.0435 ksi).
Which is cheaper, EPS 150 or XPS 400?
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 welds better, EPS 150 or XPS 400?
EPS 150. Its weldability rates fair (40/100) against poor (15/100) for XPS 400.
Ready to make it?
Upload a CAD file and FabDigit prices the part in EPS 150 and XPS 400 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.