XPS 300 vs XPS 400
Polymer · grade comparison
XPS 300 and XPS 400 are both polymer grades. XPS 400 is the stronger of the two: yield strength 0.4 MPa (0.058 ksi) against 0.3 MPa (0.0435 ksi) for XPS 300, about 33% more; tensile strength follows at 0.6 MPa (0.087 ksi) vs 0.45 MPa (0.0653 ksi). In exchange, XPS 300 is the more ductile: elongation 3% versus 2.5% for XPS 400. XPS 300 is lighter (0.04 g/cm³ vs 0.04 g/cm³ for XPS 400) and XPS 400 is stiffer (0.02 GPa vs 0.02 GPa).
XPS 300Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
XPS 400Choose it when strength drives the design.
XPS 300 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
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
Same in both: Glass Transition (Tg) 100°C212 °F · Water Absorption (24 h) 0.2% · Water Absorption (Saturation) 0.5%
Thermal
How each material carries heat and how hot it can run.
Vicat Softening Point (B50)
Same in both: Thermal Conductivity 0.03 W/m·K0.02 BTU/hr·ft·°F · Specific Heat Capacity 1,450 J/kg·K0.35 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 70 µm/m·K38.9 µin/in·°F · Max Service Temperature (continuous) 75°C167 °F · Min Service Temperature -50°C-58 °F · Limiting Oxygen Index 25% · Max Service Temperature (short-term) 85°C185 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Constant (1 MHz)
Volume Resistivity
Dissipation Factor (1 MHz)
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 15 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Processing Melt Temperature (typ.)
Same in both: Machinability 92 / 100 · Weldability 15 / 100 · Formability (cold) 10 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 100 MJ/kg42,992 BTU/lb
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Modulus of Resilience
Thermal Diffusivity
Same in both: Specific Stiffness (E / density) 0.4 MN·m/kg · 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 | XPS 300 | XPS 400 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
XPS 300 vs XPS 400 — frequently asked
Is XPS 400 stronger than XPS 300?
Yes. XPS 400 has a typical yield strength of 0.4 MPa (0.058 ksi) against 0.3 MPa (0.0435 ksi) for XPS 300 — about 33% more. Tensile strength is 0.6 MPa (0.087 ksi) vs 0.45 MPa (0.0653 ksi).
Which is cheaper, XPS 300 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.
When should I choose XPS 300 over XPS 400?
Pick XPS 300 when the part is bent, formed or impact-loaded, or when weight is the constraint. Pick XPS 400 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in XPS 300 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.