TP-PI CF30 vs TP-PI GR15
Polymer · TP-PI grade comparison
TP-PI CF30 and TP-PI GR15 are two grades of the same polymer grade, TP-PI: CF30 (30 % carbon-fiber reinforced) versus GR15 (15 % graphite filled bearing grade). The chemistry is identical, so every difference below comes from the condition. TP-PI CF30 is the stronger of the two: tensile strength 210 MPa (30.5 ksi) against 66 MPa (9.57 ksi) for TP-PI GR15, about 3.2 times as much. In exchange, TP-PI GR15 is the more ductile: elongation 4.5% versus 2% for TP-PI CF30. TP-PI CF30 is lighter (1.44 g/cm³ vs 1.51 g/cm³ for TP-PI GR15) and TP-PI CF30 is stiffer (18 GPa vs 4.5 GPa). On the shop floor, TP-PI GR15 machines more easily (good vs fair).
TP-PI CF30Choose it when strength drives the design, or when weight is the constraint.
TP-PI GR15Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
TP-PI CF30 vs TP-PI GR15: 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, Rockwell M
Same in both: Shear Modulus 1.1 GPa0.15 Msi · Bulk Modulus 4 GPa0.58 Msi · Poisson's Ratio 0.38 · Yield Strength (0.2% offset) 90 MPa13.1 ksi · Compressive Modulus 2.8 GPa0.41 Msi · Fracture Toughness (K_IC) 3 MPa·√m2.7 ksi·√in · Hardness, Shore D 88 Shore D · Hardness, Rockwell R 125 HRR
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 388°C730 °F · Glass Transition (Tg) 250°C482 °F · Water Absorption (24 h) 0.24% · Water Absorption (Saturation) 1.2% · Refractive Index 1.7
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 1,100 J/kg·K0.26 BTU/lb·°F · Min Service Temperature -269°C-452 °F · Heat Deflection Temp. @ 0.45 MPa 250°C482 °F · Vicat Softening Point (B50) 255°C491 °F · Limiting Oxygen Index 47% · Max Service Temperature (short-term) 300°C572 °F
Electrical
Conductivity and insulation.
Volume Resistivity
Surface Resistivity
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Dielectric Strength 22 kV/mm559 V/mil · Dielectric Constant (1 MHz) 3.2 · Dissipation Factor (1 MHz) 0.002 · Comparative Tracking Index (CTI) 175 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 88 / 100 · UV / Weathering Resistance 60 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Mold Shrinkage
Same in both: Weldability 25 / 100 · Formability (cold) 25 / 100 · Polishability 60 / 100 · Melt Flow Rate 3 g/10 min · Processing Melt Temperature (typ.) 410°C770 °F · Mold Temperature (typ.) 200°C392 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 300 MJ/kg128,977 BTU/lb · Embodied Carbon (primary production) 15 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.
TP-PI CF30 vs TP-PI GR15 — frequently asked
Is TP-PI CF30 stronger than TP-PI GR15?
Yes. TP-PI CF30 has a typical tensile strength of 210 MPa (30.5 ksi) against 66 MPa (9.57 ksi) for TP-PI GR15 — about 3.2 times as much.
Which grade does FabDigit quote by default, CF30 or GR15?
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, TP-PI CF30 or TP-PI GR15?
TP-PI GR15. Its machinability rates good (65/100) against fair (45/100) for TP-PI CF30.
Ready to make it?
Upload a CAD file and FabDigit prices the part in TP-PI CF30 and TP-PI GR15 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.