PEEK-450G vs PEEK-GF30
Polymer · grade comparison
PEEK-450G and PEEK-GF30 are both polymer grades. PEEK-GF30 is the stronger of the two: tensile strength 165 MPa (23.9 ksi) against 100 MPa (14.5 ksi) for PEEK-450G, about 65% more. In exchange, PEEK-450G is the more ductile: elongation 45% versus 2.5% for PEEK-GF30. PEEK-450G is lighter (1.3 g/cm³ vs 1.51 g/cm³ for PEEK-GF30) and PEEK-GF30 is stiffer (10 GPa vs 3.8 GPa). On the shop floor, PEEK-450G machines more easily (very good vs fair) and PEEK-450G welds better (good vs fair).
PEEK-450GChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PEEK-GF30Choose it when strength drives the design.
PEEK-450G vs PEEK-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
Shear Modulus
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Compressive Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell M
Hardness, Rockwell R
Same in both: Poisson's Ratio 0.38
Physical
Density and transition temperatures.
Density
Water Absorption (24 h)
Water Absorption (Saturation)
Refractive Index
Same in both: Melting Temperature (Tm) 343°C649 °F · Glass Transition (Tg) 143°C289 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Limiting Oxygen Index
Vicat Softening Point (B50)
Same in both: Min Service Temperature -60°C-76 °F · Max Service Temperature (short-term) 310°C590 °F
Electrical
Conductivity and insulation.
Dielectric Strength
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Surface Resistivity
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Volume Resistivity 1×10¹⁶ Ω·cm · Comparative Tracking Index (CTI) 150 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 40 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Polishability
Mold Shrinkage
Melt Flow Rate
Same in both: Processing Melt Temperature (typ.) 380°C716 °F · Mold Temperature (typ.) 190°C374 °F
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Diffusivity
Same in both: Thermal Shock Resistance Index 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.
Manufacturing and finishing
| Capability | PEEK-450G | PEEK-GF30 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
PEEK-450G vs PEEK-GF30 — frequently asked
Is PEEK-GF30 stronger than PEEK-450G?
Yes. PEEK-GF30 has a typical tensile strength of 165 MPa (23.9 ksi) against 100 MPa (14.5 ksi) for PEEK-450G — about 65% more.
Which is cheaper, PEEK-450G or PEEK-GF30?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, PEEK-450G or PEEK-GF30?
PEEK-450G. Its machinability rates very good (70/100) against fair (45/100) for PEEK-GF30; for welding the order is PEEK-450G first (good, 55/100) then PEEK-GF30 (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in PEEK-450G and PEEK-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.