PPE-GF30 GF20 vs PPE-GF30 GF40
Polymer · PPE-GF30 grade comparison
PPE-GF30 GF20 and PPE-GF30 GF40 are two grades of the same polymer grade, PPE-GF30: GF20 (20% glass-fiber reinforced modified PPE) versus GF40 (40% glass-fiber reinforced modified PPE). The chemistry is identical, so every difference below comes from the condition. PPE-GF30 GF40 is the stronger of the two: tensile strength 135 MPa (19.6 ksi) against 105 MPa (15.2 ksi) for PPE-GF30 GF20, about 29% more. In exchange, PPE-GF30 GF20 is the more ductile: elongation 3.5% versus 2% for PPE-GF30 GF40. PPE-GF30 GF20 is lighter (1.21 g/cm³ vs 1.42 g/cm³ for PPE-GF30 GF40) and PPE-GF30 GF40 is stiffer (11.5 GPa vs 6.2 GPa). On the shop floor, PPE-GF30 GF20 machines more easily (good vs fair).
PPE-GF30 GF20Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PPE-GF30 GF40Choose it when strength drives the design.
PPE-GF30 GF20 vs PPE-GF30 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
Flexural Strength
Flexural Modulus
Izod Impact, Notched
Same in both: Shear Modulus 3.3 GPa0.48 Msi · Poisson's Ratio 0.36 · Compressive Strength 120 MPa17.4 ksi · Compressive Modulus 8 GPa1.2 Msi · Shear Strength 68 MPa9.9 ksi · Fracture Toughness (K_IC) 3.5 MPa·√m3.2 ksi·√in · Hardness, Shore D 88 Shore D · Hardness, Rockwell M 88 HRM · Hardness, Rockwell R 118 HRR
Physical
Density and transition temperatures.
Density
Same in both: Glass Transition (Tg) 148°C298 °F · Water Absorption (24 h) 0.07% · Water Absorption (Saturation) 0.4%
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Heat Deflection Temp. @ 1.8 MPa
Same in both: Thermal Conductivity 0.22 W/m·K0.13 BTU/hr·ft·°F · Specific Heat Capacity 1,300 J/kg·K0.31 BTU/lb·°F · Max Service Temperature (continuous) 110°C230 °F · Min Service Temperature -40°C-40 °F · Heat Deflection Temp. @ 0.45 MPa 158°C316 °F · Vicat Softening Point (B50) 160°C320 °F · Limiting Oxygen Index 25% · Max Service Temperature (short-term) 145°C293 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Dielectric Strength 28 kV/mm711 V/mil · Dielectric Constant (1 MHz) 3.2 · Dissipation Factor (1 MHz) 0.004 · Volume Resistivity 1×10¹⁶ Ω·cm · Surface Resistivity 1×10¹⁵ Ω · Comparative Tracking Index (CTI) 250 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 85 / 100 · UV / Weathering Resistance 35 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Mold Shrinkage
Same in both: Weldability 45 / 100 · Formability (cold) 10 / 100 · Polishability 30 / 100 · Melt Flow Rate 8 g/10 min · Processing Melt Temperature (typ.) 290°C554 °F · Mold Temperature (typ.) 95°C203 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 95 MJ/kg40,843 BTU/lb · Embodied Carbon (primary production) 4.6 kg CO₂/kg · Embodied Water 220 L/kg26.4 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.
PPE-GF30 GF20 vs PPE-GF30 GF40 — frequently asked
Is PPE-GF30 GF40 stronger than PPE-GF30 GF20?
Yes. PPE-GF30 GF40 has a typical tensile strength of 135 MPa (19.6 ksi) against 105 MPa (15.2 ksi) for PPE-GF30 GF20 — about 29% more.
Which grade does FabDigit quote by default, GF20 or GF40?
GF30 is the default PPE-GF30 condition in the FabDigit quote flow (neither GF20 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.
Which is easier to machine, PPE-GF30 GF20 or PPE-GF30 GF40?
PPE-GF30 GF20. Its machinability rates good (62/100) against fair (48/100) for PPE-GF30 GF40.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PPE-GF30 GF20 and PPE-GF30 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.