C578 Type II vs EPS 150
Polymer · grade comparison
C578 Type II and EPS 150 are both polymer grades. EPS 150 is the stronger of the two: tensile strength 0.3 MPa (0.0435 ksi) against 0.24 MPa (0.0348 ksi) for C578 Type II, about 25% more. In exchange, C578 Type II is the more ductile: elongation 5% versus 2% for EPS 150. C578 Type II is lighter (0.02 g/cm³ vs 0.03 g/cm³ for EPS 150) and EPS 150 is stiffer (0.01 GPa vs 0 GPa). On the shop floor, C578 Type II sits in a lower cost tier (budget, $) than EPS 150 (standard, $$).
C578 Type IIChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
EPS 150Choose it when strength drives the design.
C578 Type II vs EPS 150: 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 Modulus
Yield Strength (0.2% offset)
Compression Set (22 h, 70 °C)
Same in both: Poisson's Ratio 0.1 · Flexural Strength 0.28 MPa0.04 ksi · Shear Strength 0.14 MPa0.02 ksi
Physical
Density and transition temperatures.
Density
Water Absorption (Saturation)
Same in both: Glass Transition (Tg) 100°C212 °F · Water Absorption (24 h) 1%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Max Service Temperature (continuous)
Min Service Temperature
Max Service Temperature (short-term)
Vicat Softening Point (B50)
Same in both: Thermal Expansion (CTE, 20–100 °C) 65 µm/m·K36.1 µin/in·°F · Limiting Oxygen Index 25%
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Volume Resistivity
Same in both: Dielectric Constant (1 MHz) 1.03 · Dissipation Factor (1 MHz) 3×10⁻⁴
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 12 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Processing Melt Temperature (typ.)
Same in both: Weldability 40 / 100 · Mold Shrinkage 0.4%
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Same in both: Embodied Energy (primary production) 95 MJ/kg40,843 BTU/lb · Typical Recycled Content 5%
Common Calculations
Ratios derived from the values above.
Specific Stiffness (E / density)
Thermal Diffusivity
Same in both: Specific Strength (UTS / density) 11 kN·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 | C578 Type II | EPS 150 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $ Budget | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
C578 Type II vs EPS 150 — frequently asked
Is EPS 150 stronger than C578 Type II?
Yes. EPS 150 has a typical tensile strength of 0.3 MPa (0.0435 ksi) against 0.24 MPa (0.0348 ksi) for C578 Type II — about 25% more.
Which is cheaper, C578 Type II or EPS 150?
C578 Type II is the lower-cost material: it sits in the budget tier ($) while EPS 150 is standard ($$). 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, C578 Type II or EPS 150?
C578 Type II, by a small margin. Both rate excellent for machinability — 95/100 against 88/100 for EPS 150.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C578 Type II and EPS 150 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.