PETG-CF CF20 vs PETG-CF CF30
Polymer · PETG-CF grade comparison
PETG-CF CF20 and PETG-CF CF30 are two grades of the same polymer grade, PETG-CF: CF20 (~15–20 wt% chopped carbon fiber) versus CF30 (~25–30 wt% carbon fiber). The chemistry is identical, so every difference below comes from the condition. PETG-CF CF30 is the stronger of the two: tensile strength 56 MPa (8.12 ksi) against 52 MPa (7.54 ksi) for PETG-CF CF20, about 8% more. In exchange, PETG-CF CF20 is the more ductile: elongation 4.5% versus 2.2% for PETG-CF CF30. PETG-CF CF30 is stiffer (6.2 GPa vs 4.2 GPa) and PETG-CF CF30 conducts heat better (0.38 W/m·K vs 0.3 W/m·K).
PETG-CF CF20Choose it when the part is bent, formed or impact-loaded.
PETG-CF CF30Choose it when strength drives the design.
PETG-CF CF20 vs PETG-CF CF30: 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
Flexural Strength
Flexural Modulus
Izod Impact, Notched
Same in both: Poisson's Ratio 0.38 · Yield Strength (0.2% offset) 50 MPa7.3 ksi · Compressive Strength 70 MPa10.2 ksi · Compressive Modulus 4 GPa0.58 Msi · Shear Strength 40 MPa5.8 ksi · Hardness, Shore D 80 Shore D · Hardness, Rockwell R 112 HRR
Physical
Density and transition temperatures.
Density
Same in both: Glass Transition (Tg) 79°C174 °F · Water Absorption (24 h) 0.14% · Water Absorption (Saturation) 0.5%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Same in both: Specific Heat Capacity 1,250 J/kg·K0.3 BTU/lb·°F · Max Service Temperature (continuous) 68°C154 °F · Min Service Temperature -40°C-40 °F · Vicat Softening Point (B50) 82°C180 °F · Limiting Oxygen Index 23% · Max Service Temperature (short-term) 85°C185 °F
Electrical
Conductivity and insulation.
Same in both: Volume Resistivity 1×10¹² Ω·cm · Surface Resistivity 1×10¹³ Ω
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 78 / 100 · UV / Weathering Resistance 50 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Weldability 45 / 100 · Formability (cold) 25 / 100 · Polishability 30 / 100 · Mold Shrinkage 0.3% · Melt Flow Rate 12 g/10 min · Processing Melt Temperature (typ.) 250°C482 °F · Mold Temperature (typ.) 78°C172 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 110 MJ/kg47,292 BTU/lb · Embodied Carbon (primary production) 7 kg CO₂/kg · Embodied Water 90 L/kg10.8 gal/lb · Typical Recycled Content 5%
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.
PETG-CF CF20 vs PETG-CF CF30 — frequently asked
Is PETG-CF CF30 stronger than PETG-CF CF20?
Yes. PETG-CF CF30 has a typical tensile strength of 56 MPa (8.12 ksi) against 52 MPa (7.54 ksi) for PETG-CF CF20 — about 8% more.
Which grade does FabDigit quote by default, CF20 or CF30?
CF20 is the default PETG-CF condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, PETG-CF CF20 or PETG-CF CF30?
PETG-CF CF20, by a small margin. Both rate good for machinability — 62/100 against 55/100 for PETG-CF CF30.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PETG-CF CF20 and PETG-CF CF30 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.