E-44 vs E-51
Polymer · grade comparison
E-44 and E-51 are both polymer grades. E-44 is the more ductile: elongation 4.5% versus 4% for E-51.
E-44Choose it when the part is bent, formed or impact-loaded.
E-44 vs E-51: 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
Bulk Modulus
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Hardness, Shore D
Same in both: Poisson's Ratio 0.35 · Compressive Modulus 2.9 GPa0.42 Msi · Flexural Modulus 3 GPa0.44 Msi · Izod Impact, Notched 25 J/m0.47 ft·lbf/in · Hardness, Rockwell M 100 HRM
Physical
Density and transition temperatures.
Density
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.
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Max Service Temperature (short-term)
Same in both: Thermal Conductivity 0.19 W/m·K0.11 BTU/hr·ft·°F · Min Service Temperature -50°C-58 °F · Limiting Oxygen Index 20%
Electrical
Conductivity and insulation.
Dielectric Strength
Dielectric Constant (1 MHz)
Comparative Tracking Index (CTI)
Same in both: Electrical Resistivity 1×10¹³ Ω·m3.94×10²⁰ µΩ·in · Dissipation Factor (1 MHz) 0.02 · Volume Resistivity 1×10¹⁵ Ω·cm · Surface Resistivity 1×10¹⁴ Ω
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 25 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Mold Shrinkage
Same in both: Polishability 70 / 100 · Mold Temperature (typ.) 80°C176 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 137 MJ/kg58,899 BTU/lb · Embodied Carbon (primary production) 6.5 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Thermal Diffusivity
Same in both: Specific Stiffness (E / density) 2.6 MN·m/kg · 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 | E-44 | E-51 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
E-44 vs E-51 — frequently asked
What is the difference between E-44 and E-51?
E-44 and E-51 are both polymer grades. E-44 is the more ductile: elongation 4.5% versus 4% for E-51.
Which is cheaper, E-44 or E-51?
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, E-44 or E-51?
E-44, by a small margin. Both rate good for machinability — 60/100 against 55/100 for E-51.
Ready to make it?
Upload a CAD file and FabDigit prices the part in E-44 and E-51 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.