C578 Type VII vs JIS A9511 EPS
Polymer · grade comparison
C578 Type VII and JIS A9511 EPS are both polymer grades. C578 Type VII is the stronger of the two: tensile strength 0.55 MPa (0.0798 ksi) against 0.2 MPa (0.029 ksi) for JIS A9511 EPS, about 175% more. JIS A9511 EPS is lighter (0.02 g/cm³ vs 0.04 g/cm³ for C578 Type VII) and C578 Type VII is stiffer (0.02 GPa vs 0.01 GPa). On the shop floor, JIS A9511 EPS welds better (30 vs 20 out of 100).
C578 Type VIIChoose it when strength drives the design.
JIS A9511 EPSChoose it when weight is the constraint, or when it will be welded.
C578 Type VII 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
Poisson's Ratio
Tensile Strength (Ultimate)
Compressive Strength
Compressive Modulus
Flexural Strength
Shear Strength
Yield Strength (0.2% offset)
Elongation at Break
Flexural Modulus
Compression Set (22 h, 70 °C)
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
Thermal Expansion (CTE, 20–100 °C)
Min Service Temperature
Limiting Oxygen Index
Vicat Softening Point (B50)
Same in both: Max Service Temperature (continuous) 75°C167 °F · Max Service Temperature (short-term) 85°C185 °F
Electrical
Conductivity and insulation.
Dielectric Constant (1 MHz)
Electrical Resistivity
Dissipation Factor (1 MHz)
Volume Resistivity
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
Processing Melt Temperature (typ.)
Mold Shrinkage
Mold Temperature (typ.)
Same in both: Formability (cold) 25 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 105 MJ/kg45,142 BTU/lb
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 VII | JIS A9511 EPS |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
C578 Type VII vs JIS A9511 EPS — frequently asked
Is C578 Type VII stronger than JIS A9511 EPS?
Yes. C578 Type VII has a typical tensile strength of 0.55 MPa (0.0798 ksi) against 0.2 MPa (0.029 ksi) for JIS A9511 EPS — about 175% more.
Which is cheaper, C578 Type VII 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 VII or JIS A9511 EPS?
JIS A9511 EPS, by a small margin. Both rate excellent for machinability — 90/100 against 85/100 for C578 Type VII; for welding the order is JIS A9511 EPS first (poor, 30/100) then C578 Type VII (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C578 Type VII 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.