PA6/66 CF20 vs PA6/66 GF50
Polymer · PA6/66 grade comparison
PA6/66 CF20 and PA6/66 GF50 are two grades of the same polymer grade, PA6/66: CF20 (20% carbon fiber reinforced) versus GF50 (50% short glass fiber reinforced). The chemistry is identical, so every difference below comes from the condition. PA6/66 GF50 is the stronger of the two: tensile strength 210 MPa (30.5 ksi) against 190 MPa (27.6 ksi) for PA6/66 CF20, about 11% more. PA6/66 CF20 is lighter (1.24 g/cm³ vs 1.57 g/cm³ for PA6/66 GF50) and PA6/66 GF50 is stiffer (16 GPa vs 15 GPa).
PA6/66 CF20Choose it when weight is the constraint.
PA6/66 GF50Choose it when strength drives the design, or when the part sees heat.
PA6/66 CF20 vs PA6/66 GF50: 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)
Flexural Strength
Flexural Modulus
Izod Impact, Notched
Same in both: Shear Modulus 1 GPa0.15 Msi · Poisson's Ratio 0.39 · Yield Strength (0.2% offset) 72 MPa10.4 ksi · Elongation at Break 2.5% · Compressive Strength 80 MPa11.6 ksi · Shear Strength 55 MPa8 ksi · Hardness, Shore D 80 Shore D · Hardness, Rockwell M 78 HRM · Hardness, Rockwell R 118 HRR
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 196°C385 °F · Glass Transition (Tg) 50°C122 °F · Water Absorption (24 h) 1.8% · Water Absorption (Saturation) 9.5%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Heat Deflection Temp. @ 1.8 MPa
Same in both: Specific Heat Capacity 1,700 J/kg·K0.41 BTU/lb·°F · Min Service Temperature -40°C-40 °F · Heat Deflection Temp. @ 0.45 MPa 165°C329 °F · Vicat Softening Point (B50) 180°C356 °F · Limiting Oxygen Index 24% · Max Service Temperature (short-term) 150°C302 °F
Electrical
Conductivity and insulation.
Surface Resistivity
Same in both: Electrical Resistivity 1×10¹² Ω·m3.94×10¹⁹ µΩ·in · Dielectric Strength 25 kV/mm635 V/mil · Dielectric Constant (1 MHz) 3.4 · Dissipation Factor (1 MHz) 0.03 · Volume Resistivity 1×10¹⁴ Ω·cm · Comparative Tracking Index (CTI) 600 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 60 / 100 · UV / Weathering Resistance 30 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Weldability 78 / 100 · Formability (cold) 60 / 100 · Polishability 55 / 100 · Mold Shrinkage 0.3% · Melt Flow Rate 25 g/10 min · Processing Melt Temperature (typ.) 260°C500 °F · Mold Temperature (typ.) 70°C158 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 122 MJ/kg52,451 BTU/lb · Embodied Carbon (primary production) 7.5 kg CO₂/kg · Embodied Water 450 L/kg53.9 gal/lb · Typical Recycled Content 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.
PA6/66 CF20 vs PA6/66 GF50 — frequently asked
Is PA6/66 GF50 stronger than PA6/66 CF20?
Yes. PA6/66 GF50 has a typical tensile strength of 210 MPa (30.5 ksi) against 190 MPa (27.6 ksi) for PA6/66 CF20 — about 11% more.
Which grade does FabDigit quote by default, CF20 or GF50?
Specify the condition in the material field or the drawing note; FabDigit prices the quote for the state you call out.
Which is easier to machine, PA6/66 CF20 or PA6/66 GF50?
PA6/66 CF20. Its machinability rates fair (38/100) against poor (32/100) for PA6/66 GF50.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PA6/66 CF20 and PA6/66 GF50 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.