PU-GF-Filled GF30 vs PU-GF-Filled GF40
Polyurethane · PU-GF-Filled grade comparison
PU-GF-Filled GF30 and PU-GF-Filled GF40 are two grades of the same polyurethane grade, PU-GF-Filled: GF30 (30 wt% short glass fibre filled) versus GF40 (40 wt% glass filled, high-stiffness grade). The chemistry is identical, so every difference below comes from the condition. PU-GF-Filled GF40 is the stronger of the two: tensile strength 68 MPa (9.86 ksi) against 60 MPa (8.7 ksi) for PU-GF-Filled GF30, about 13% more. In exchange, PU-GF-Filled GF30 is the more ductile: elongation 2.5% versus 1.5% for PU-GF-Filled GF40. PU-GF-Filled GF30 is lighter (1.55 g/cm³ vs 1.72 g/cm³ for PU-GF-Filled GF40) and PU-GF-Filled GF40 is stiffer (8 GPa vs 5.5 GPa). On the shop floor, PU-GF-Filled GF30 machines more easily (good vs fair).
PU-GF-Filled GF30Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PU-GF-Filled GF40Choose it when strength drives the design.
PU-GF-Filled GF30 vs PU-GF-Filled GF40: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all polyurethane 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 polyurethane 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.
PU-GF-Filled GF30PU-GF-Filled GF40
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
Hardness, Shore D
Same in both: Poisson's Ratio 0.38 · Compressive Strength 110 MPa16 ksi · Compressive Modulus 5 GPa0.73 Msi · Hardness, Rockwell R 118 HRR
Physical
Density and transition temperatures.
Density
Same in both: Glass Transition (Tg) 95°C203 °F · Water Absorption (24 h) 0.2% · Water Absorption (Saturation) 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
Same in both: Specific Heat Capacity 1,300 J/kg·K0.31 BTU/lb·°F · Max Service Temperature (continuous) 100°C212 °F · Min Service Temperature -30°C-22 °F · Limiting Oxygen Index 21% · Max Service Temperature (short-term) 130°C266 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹¹ Ω·m3.94×10¹⁸ µΩ·in · Dielectric Strength 18 kV/mm457 V/mil · Dielectric Constant (1 MHz) 4.5 · Dissipation Factor (1 MHz) 0.04 · Volume Resistivity 1×10¹³ Ω·cm · Surface Resistivity 1×10¹³ Ω · Comparative Tracking Index (CTI) 500 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 80 / 100 · UV / Weathering Resistance 25 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Mold Shrinkage
Same in both: Weldability 5 / 100 · Formability (cold) 5 / 100 · Polishability 55 / 100 · Mold Temperature (typ.) 65°C149 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 90 MJ/kg38,693 BTU/lb · Embodied Carbon (primary production) 5 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 0%
Strength versus weight
Yield strength against density for every polyurethane grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
PU-GF-Filled GF30 vs PU-GF-Filled GF40 — frequently asked
Is PU-GF-Filled GF40 stronger than PU-GF-Filled GF30?
Yes. PU-GF-Filled GF40 has a typical tensile strength of 68 MPa (9.86 ksi) against 60 MPa (8.7 ksi) for PU-GF-Filled GF30 — about 13% more.
Which grade does FabDigit quote by default, GF30 or GF40?
GF30 is the default PU-GF-Filled 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, PU-GF-Filled GF30 or PU-GF-Filled GF40?
PU-GF-Filled GF30. Its machinability rates good (60/100) against fair (50/100) for PU-GF-Filled GF40.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PU-GF-Filled GF30 and PU-GF-Filled 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.