EVOH vs Ionomer
Polymer · grade comparison
EVOH and Ionomer are both polymer grades. EVOH is the stronger of the two: yield strength 58 MPa (8.41 ksi) against 15 MPa (2.18 ksi) for Ionomer, about 3.9 times as much; tensile strength follows at 68 MPa (9.86 ksi) vs 30 MPa (4.35 ksi). In exchange, Ionomer is the more ductile: elongation 380% versus 230% for EVOH, and EVOH is harder (78 Shore D vs 60 Shore D). Ionomer is lighter (0.95 g/cm³ vs 1.19 g/cm³ for EVOH) and EVOH is stiffer (2.9 GPa vs 0.28 GPa). On the shop floor, EVOH machines more easily (good vs poor) and Ionomer welds better (excellent vs good).
EVOHChoose it when strength drives the design, or when the part sees heat.
IonomerChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
EVOH vs Ionomer: 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
Flexural Strength
Flexural Modulus
Shear Strength
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell M
Hardness, Rockwell R
Shear Modulus
Hardness, Shore A
Physical
Density and transition temperatures.
Density
Melting Temperature (Tm)
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
Refractive Index
Light Transmission
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
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Vicat Softening Point (B50)
Limiting Oxygen Index
Max Service Temperature (short-term)
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Constant (1 MHz)
Volume Resistivity
Dielectric Strength
Dissipation Factor (1 MHz)
Surface Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 40 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Polishability
Mold Shrinkage
Melt Flow Rate
Processing Melt Temperature (typ.)
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 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Same in both: Thermal Diffusivity 0.1 mm²/s · 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 | EVOH | Ionomer |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
EVOH vs Ionomer — frequently asked
Is EVOH stronger than Ionomer?
Yes. EVOH has a typical yield strength of 58 MPa (8.41 ksi) against 15 MPa (2.18 ksi) for Ionomer — about 3.9 times as much. Tensile strength is 68 MPa (9.86 ksi) vs 30 MPa (4.35 ksi).
Which is cheaper, EVOH or Ionomer?
Both sit in the same relative cost tier ($$$, premium); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, EVOH or Ionomer?
EVOH. Its machinability rates good (55/100) against poor (30/100) for Ionomer; for welding the order is Ionomer first (excellent, 92/100) then EVOH (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in EVOH and Ionomer 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.