Xydar CF30 vs Xydar GF40
Polymer · Xydar grade comparison
Xydar CF30 and Xydar GF40 are two grades of the same polymer grade, Xydar: CF30 (30 % carbon-fiber reinforced) versus GF40 (40 % glass-fiber reinforced). The chemistry is identical, so every difference below comes from the condition. Xydar CF30 is the stronger of the two: tensile strength 190 MPa (27.6 ksi) against 155 MPa (22.5 ksi) for Xydar GF40, about 23% more. In exchange, Xydar GF40 is the more ductile: elongation 1.6% versus 1.2% for Xydar CF30. Xydar CF30 is lighter (1.55 g/cm³ vs 1.75 g/cm³ for Xydar GF40) and Xydar CF30 is stiffer (23 GPa vs 17 GPa).
Xydar CF30Choose it when strength drives the design, or when weight is the constraint.
Xydar GF40Choose it when the part is bent, formed or impact-loaded.
Xydar CF30 vs Xydar GF40: 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
Compressive Strength
Flexural Strength
Flexural Modulus
Shear Strength
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell M
Same in both: Poisson's Ratio 0.35 · Fracture Toughness (K_IC) 2.5 MPa·√m2.3 ksi·√in
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 350°C662 °F · Glass Transition (Tg) 135°C275 °F · Water Absorption (24 h) 0.03% · Water Absorption (Saturation) 0.1%
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
Limiting Oxygen Index
Same in both: Specific Heat Capacity 1,150 J/kg·K0.27 BTU/lb·°F · Max Service Temperature (continuous) 250°C482 °F · Min Service Temperature -100°C-148 °F · Max Service Temperature (short-term) 300°C572 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Surface Resistivity
Same in both: Dielectric Strength 35 kV/mm889 V/mil · Dielectric Constant (1 MHz) 3.7 · Dissipation Factor (1 MHz) 0.005 · Volume Resistivity 1×10¹⁵ Ω·cm · Comparative Tracking Index (CTI) 200 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 55 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Weldability
Mold Shrinkage
Same in both: Machinability 30 / 100 · Formability (cold) 10 / 100 · Polishability 40 / 100 · Processing Melt Temperature (typ.) 380°C716 °F · Mold Temperature (typ.) 120°C248 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 220 MJ/kg94,583 BTU/lb · Embodied Carbon (primary production) 10 kg CO₂/kg · Embodied Water 500 L/kg59.9 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.
Xydar CF30 vs Xydar GF40 — frequently asked
Is Xydar CF30 stronger than Xydar GF40?
Yes. Xydar CF30 has a typical tensile strength of 190 MPa (27.6 ksi) against 155 MPa (22.5 ksi) for Xydar GF40 — about 23% more.
Which grade does FabDigit quote by default, CF30 or GF40?
NEAT is the default Xydar condition in the FabDigit quote flow (neither CF30 nor GF40). 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.
When should I choose Xydar CF30 over Xydar GF40?
Pick Xydar CF30 when strength drives the design, or when weight is the constraint. Pick Xydar GF40 when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Xydar CF30 and Xydar GF40 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.