PP-C GF30 vs PP-C T40
Polymer · PP-C grade comparison
PP-C GF30 and PP-C T40 are two grades of the same polymer grade, PP-C: GF30 (30 % coupled short glass fiber) versus T40 (40 % talc/mineral-filled copolymer). The chemistry is identical, so every difference below comes from the condition. PP-C GF30 is the stronger of the two: tensile strength 72 MPa (10.4 ksi) against 26 MPa (3.77 ksi) for PP-C T40, about 177% more. In exchange, PP-C T40 is the more ductile: elongation 14% versus 3.5% for PP-C GF30. PP-C GF30 is lighter (1.13 g/cm³ vs 1.24 g/cm³ for PP-C T40) and PP-C GF30 is stiffer (6 GPa vs 3.3 GPa). On the shop floor, PP-C T40 welds better (excellent vs good).
PP-C GF30Choose it when strength drives the design, or when weight is the constraint.
PP-C T40Choose it when the part is bent, formed or impact-loaded, or when it will be welded.
PP-C GF30 vs PP-C T40: 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
Izod Impact, Notched
Hardness, Rockwell R
Same in both: Shear Modulus 0.4 GPa0.06 Msi · Bulk Modulus 3 GPa0.48 Msi · Poisson's Ratio 0.43 · Yield Strength (0.2% offset) 25 MPa3.6 ksi · Compressive Modulus 1 GPa0.15 Msi · Shear Strength 20 MPa2.9 ksi · Fracture Toughness (K_IC) 3.8 MPa·√m3.5 ksi·√in · Hardness, Shore D 67 Shore D
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 164°C327 °F · Glass Transition (Tg) -18°C-0.4 °F · Water Absorption (24 h) 0.02% · Water Absorption (Saturation) 0.1% · Refractive Index 1.49
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. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Vicat Softening Point (B50)
Limiting Oxygen Index
Same in both: Specific Heat Capacity 1,900 J/kg·K0.45 BTU/lb·°F · Min Service Temperature -35°C-31 °F · Max Service Temperature (short-term) 120°C248 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Dielectric Strength 25 kV/mm635 V/mil · Dielectric Constant (1 MHz) 2.25 · Dissipation Factor (1 MHz) 4×10⁻⁴ · Volume Resistivity 1×10¹⁶ Ω·cm · Surface Resistivity 1×10¹⁵ Ω · Comparative Tracking Index (CTI) 600 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 90 / 100 · UV / Weathering Resistance 25 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Mold Shrinkage
Melt Flow Rate
Processing Melt Temperature (typ.)
Mold Temperature (typ.)
Same in both: Polishability 40 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 78 MJ/kg33,534 BTU/lb · Embodied Carbon (primary production) 2 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.
PP-C GF30 vs PP-C T40 — frequently asked
Is PP-C GF30 stronger than PP-C T40?
Yes. PP-C GF30 has a typical tensile strength of 72 MPa (10.4 ksi) against 26 MPa (3.77 ksi) for PP-C T40 — about 177% more.
Which grade does FabDigit quote by default, GF30 or T40?
ICP is the default PP-C condition in the FabDigit quote flow (neither GF30 nor T40). 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, PP-C GF30 or PP-C T40?
PP-C T40, by a small margin. Both rate fair for machinability — 50/100 against 45/100 for PP-C GF30; for welding the order is PP-C T40 first (excellent, 88/100) then PP-C GF30 (good, 60/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in PP-C GF30 and PP-C T40 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.