PPA GF15 vs PPA GF50
Polymer · PPA grade comparison
PPA GF15 and PPA GF50 are two grades of the same polymer grade, PPA: GF15 (15% glass fiber reinforced) versus GF50 (45–50% glass fiber reinforced). The chemistry is identical, so every difference below comes from the condition. PPA GF50 is the stronger of the two: tensile strength 245 MPa (35.5 ksi) against 150 MPa (21.8 ksi) for PPA GF15, about 63% more. In exchange, PPA GF15 is the more ductile: elongation 3.5% versus 1.9% for PPA GF50. PPA GF15 is lighter (1.29 g/cm³ vs 1.62 g/cm³ for PPA GF50) and PPA GF50 is stiffer (17 GPa vs 6.2 GPa). On the shop floor, PPA GF15 machines more easily (good vs fair).
PPA GF15Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PPA GF50Choose it when strength drives the design.
PPA GF15 vs PPA GF50: 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
Same in both: Poisson's Ratio 0.35 · Hardness, Rockwell M 95 HRM
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 315°C599 °F · Glass Transition (Tg) 123°C253 °F · Water Absorption (24 h) 0.25% · Water Absorption (Saturation) 1.3%
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
Same in both: Specific Heat Capacity 1,300 J/kg·K0.31 BTU/lb·°F · Min Service Temperature -40°C-40 °F · Limiting Oxygen Index 26% · Max Service Temperature (short-term) 250°C482 °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) 4 · Dissipation Factor (1 MHz) 0.017 · 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 82 / 100 · UV / Weathering Resistance 40 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Mold Shrinkage
Same in both: Weldability 40 / 100 · Formability (cold) 10 / 100 · Polishability 30 / 100 · Processing Melt Temperature (typ.) 330°C626 °F · Mold Temperature (typ.) 150°C302 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 140 MJ/kg60,189 BTU/lb · Embodied Carbon (primary production) 8 kg CO₂/kg · Embodied Water 300 L/kg35.9 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.
PPA GF15 vs PPA GF50 — frequently asked
Is PPA GF50 stronger than PPA GF15?
Yes. PPA GF50 has a typical tensile strength of 245 MPa (35.5 ksi) against 150 MPa (21.8 ksi) for PPA GF15 — about 63% more.
Which grade does FabDigit quote by default, GF15 or GF50?
GF30 is the default PPA condition in the FabDigit quote flow (neither GF15 nor GF50). 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, PPA GF15 or PPA GF50?
PPA GF15. Its machinability rates good (60/100) against fair (42/100) for PPA GF50.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PPA GF15 and PPA GF50 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.