C578 Type II vs JIS A9511 EPS
Polymer · grade comparison
C578 Type II and JIS A9511 EPS are both polymer grades. C578 Type II is the stronger of the two: tensile strength 0.24 MPa (0.0348 ksi) against 0.2 MPa (0.029 ksi) for JIS A9511 EPS, about 20% more. C578 Type II is the more ductile: elongation 5% versus 1.5% for JIS A9511 EPS. JIS A9511 EPS is lighter (0.02 g/cm³ vs 0.02 g/cm³ for C578 Type II). On the shop floor, C578 Type II welds better (fair vs poor) and C578 Type II sits in a lower cost tier (budget, $) than JIS A9511 EPS (standard, $$).
C578 Type IIChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
JIS A9511 EPSChoose it when weight is the constraint.
C578 Type II vs JIS A9511 EPS: 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
Flexural Strength
Flexural Modulus
Shear Strength
Yield Strength (0.2% offset)
Compression Set (22 h, 70 °C)
Same in both: Poisson's Ratio 0.1 · Compressive Modulus 0 GPa6.53×10⁻⁴ Msi
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
Limiting Oxygen Index
Vicat Softening Point (B50)
Same in both: Thermal Expansion (CTE, 20–100 °C) 65 µm/m·K36.1 µin/in·°F · Max Service Temperature (continuous) 75°C167 °F · Min Service Temperature -80°C-112 °F · Max Service Temperature (short-term) 85°C185 °F
Electrical
Conductivity and insulation.
Dielectric Strength
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
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.)
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 5%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
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 | C578 Type II | JIS A9511 EPS |
|---|---|---|
| Default condition | — | — |
| Relative cost | $ Budget | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
C578 Type II vs JIS A9511 EPS — frequently asked
Is C578 Type II stronger than JIS A9511 EPS?
Yes. C578 Type II has a typical tensile strength of 0.24 MPa (0.0348 ksi) against 0.2 MPa (0.029 ksi) for JIS A9511 EPS — about 20% more.
Which is cheaper, C578 Type II or JIS A9511 EPS?
C578 Type II is the lower-cost material: it sits in the budget tier ($) while JIS A9511 EPS 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 JIS A9511 EPS?
C578 Type II, by a small margin. Both rate excellent for machinability — 95/100 against 90/100 for JIS A9511 EPS; for welding the order is C578 Type II first (fair, 40/100) then JIS A9511 EPS (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C578 Type II and JIS A9511 EPS 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.