EPS vs PC-ABS
Polymer · grade comparison
EPS and PC-ABS are both polymer grades. PC-ABS is the stronger of the two: yield strength 55 MPa (7.98 ksi) against 0.2 MPa (0.029 ksi) for EPS, about 275 times as much; tensile strength follows at 56 MPa (8.12 ksi) vs 0.25 MPa (0.0363 ksi). PC-ABS is the more ductile: elongation 90% versus 3% for EPS. EPS is lighter (0.02 g/cm³ vs 1.15 g/cm³ for PC-ABS) and PC-ABS is stiffer (2.4 GPa vs 0.01 GPa). On the shop floor, EPS machines more easily (excellent vs good), PC-ABS welds better (very good vs fair), and EPS sits in a lower cost tier (budget, $) than PC-ABS (standard, $$).
EPSChoose it when weight is the constraint, or when the part is machined in volume.
PC-ABSChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
EPS vs PC-ABS: 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
Shear Modulus
Bulk Modulus
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell M
Hardness, Rockwell R
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
Vicat Softening Point (B50)
Limiting Oxygen Index
Max Service Temperature (short-term)
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Electrical
Conductivity and insulation.
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Dielectric Strength
Surface Resistivity
Comparative Tracking Index (CTI)
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Volume Resistivity 1×10¹⁶ 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
Mold Temperature (typ.)
Polishability
Melt Flow Rate
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 | PC-ABS |
|---|---|---|
| CNC machining | — | Yes |
| Sheet metal | — | Yes |
| Injection molding | — | Yes |
| Default condition | — | Unfilled |
| Relative cost | $ Budget | $$ Standard |
| Min. machined wall | — | 0.5 mm |
| Best machined surface | — | Ra 0.8 µm |
| Chrome Plating (Plastic) | — | Yes |
| EMI Shielding Coating | — | Yes |
| Painting | — | Yes |
| Soft Touch Coating | — | Yes |
| Spray Painting | — | Yes |
| UV Coating | — | Yes |
EPS vs PC-ABS — frequently asked
Is PC-ABS stronger than EPS?
Yes. PC-ABS has a typical yield strength of 55 MPa (7.98 ksi) against 0.2 MPa (0.029 ksi) for EPS — about 275 times as much. Tensile strength is 56 MPa (8.12 ksi) vs 0.25 MPa (0.0363 ksi).
Which is cheaper, EPS or PC-ABS?
EPS is the lower-cost material: it sits in the budget tier ($) while PC-ABS 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, EPS or PC-ABS?
EPS. Its machinability rates excellent (90/100) against good (65/100) for PC-ABS; for welding the order is PC-ABS first (very good, 72/100) then EPS (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in EPS and PC-ABS 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.