PAI Bearing Grade vs PAI GF30
Polymer · PAI grade comparison
PAI Bearing Grade and PAI GF30 are two grades of the same polymer grade, PAI: Bearing Grade (graphite/PTFE lubricated PAI) versus GF30 (30% glass-fiber reinforced PAI). The chemistry is identical, so every difference below comes from the condition. PAI GF30 is the stronger of the two: tensile strength 205 MPa (29.7 ksi) against 117 MPa (17 ksi) for PAI Bearing Grade, about 75% more. PAI Bearing Grade is lighter (1.46 g/cm³ vs 1.61 g/cm³ for PAI GF30) and PAI GF30 is stiffer (11 GPa vs 6.8 GPa). On the shop floor, PAI Bearing Grade machines more easily (good vs fair).
PAI Bearing GradeChoose it when weight is the constraint, or when the part is machined in volume.
PAI GF30Choose it when strength drives the design.
PAI Bearing Grade vs PAI GF30: 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)
Compressive Strength
Flexural Strength
Flexural Modulus
Shear Strength
Izod Impact, Notched
Same in both: Shear Modulus 1.6 GPa0.23 Msi · Poisson's Ratio 0.42 · Elongation at Break 7% · Compressive Modulus 4 GPa0.58 Msi · Hardness, Shore D 88 Shore D · Hardness, Rockwell M 110 HRM
Physical
Density and transition temperatures.
Density
Same in both: Glass Transition (Tg) 275°C527 °F · Water Absorption (24 h) 0.28% · Water Absorption (Saturation) 5%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Heat Deflection Temp. @ 1.8 MPa
Same in both: Specific Heat Capacity 1,000 J/kg·K0.24 BTU/lb·°F · Max Service Temperature (continuous) 250°C482 °F · Min Service Temperature -196°C-321 °F · Heat Deflection Temp. @ 0.45 MPa 282°C540 °F · Limiting Oxygen Index 45% · Max Service Temperature (short-term) 280°C536 °F
Electrical
Conductivity and insulation.
Dielectric Strength
Volume Resistivity
Same in both: Electrical Resistivity 1×10¹⁵ Ω·m3.94×10²² µΩ·in · Dielectric Constant (1 MHz) 3.9 · Dissipation Factor (1 MHz) 0.03 · Surface Resistivity 1×10¹⁸ Ω · Comparative Tracking Index (CTI) 200 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 80 / 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 10 / 100 · Formability (cold) 15 / 100 · Polishability 70 / 100 · Processing Melt Temperature (typ.) 350°C662 °F · Mold Temperature (typ.) 215°C419 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 300 MJ/kg128,977 BTU/lb · Embodied Carbon (primary production) 14 kg CO₂/kg · 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.
PAI Bearing Grade vs PAI GF30 — frequently asked
Is PAI GF30 stronger than PAI Bearing Grade?
Yes. PAI GF30 has a typical tensile strength of 205 MPa (29.7 ksi) against 117 MPa (17 ksi) for PAI Bearing Grade — about 75% more.
Which grade does FabDigit quote by default, Bearing Grade or GF30?
Unfilled (Electrical) is the default PAI condition in the FabDigit quote flow (neither Bearing Grade nor GF30). 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, PAI Bearing Grade or PAI GF30?
PAI Bearing Grade. Its machinability rates good (55/100) against fair (40/100) for PAI GF30.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PAI Bearing Grade and PAI GF30 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.