C578 Type XI vs JIS A9511 EPS
Polymer · grade comparison
C578 Type XI and JIS A9511 EPS are both polymer grades. JIS A9511 EPS is the stronger of the two: tensile strength 0.2 MPa (0.029 ksi) against 0.08 MPa (0.0116 ksi) for C578 Type XI, about 150% more. In exchange, C578 Type XI is the more ductile: elongation 2.5% versus 1.5% for JIS A9511 EPS. C578 Type XI is lighter (0.01 g/cm³ vs 0.02 g/cm³ for JIS A9511 EPS) and JIS A9511 EPS is stiffer (0.01 GPa vs 0 GPa). On the shop floor, JIS A9511 EPS machines more easily (excellent vs good).
C578 Type XIChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
JIS A9511 EPSChoose it when strength drives the design, or when the part is machined in volume.
C578 Type XI 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
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Compressive Modulus
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
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
Min Service Temperature
Limiting Oxygen Index
Max Service Temperature (short-term)
Same in both: Thermal Expansion (CTE, 20–100 °C) 65 µm/m·K36.1 µin/in·°F · Max Service Temperature (continuous) 75°C167 °F · Vicat Softening Point (B50) 98°C208 °F
Electrical
Conductivity and insulation.
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
Same in both: UV / Weathering Resistance 15 / 100
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 Carbon (primary production)
Embodied Water
Same in both: Embodied Energy (primary production) 105 MJ/kg45,142 BTU/lb · 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 XI | JIS A9511 EPS |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
C578 Type XI vs JIS A9511 EPS — frequently asked
Is JIS A9511 EPS stronger than C578 Type XI?
Yes. JIS A9511 EPS has a typical tensile strength of 0.2 MPa (0.029 ksi) against 0.08 MPa (0.0116 ksi) for C578 Type XI — about 150% more.
Which is cheaper, C578 Type XI or JIS A9511 EPS?
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 is easier to machine, C578 Type XI or JIS A9511 EPS?
JIS A9511 EPS. Its machinability rates excellent (90/100) against good (55/100) for C578 Type XI; for welding the order is JIS A9511 EPS first (poor, 30/100) then C578 Type XI (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C578 Type XI 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.