PEEK GF20 vs PEEK GF30
Polymer · grade comparison
PEEK GF20 and PEEK-GF30 are both polymer grades, compared here in the GF20 condition. PEEK-GF30 is the stronger of the two: tensile strength 165 MPa (23.9 ksi) against 140 MPa (20.3 ksi) for PEEK GF20, about 18% more. In exchange, PEEK GF20 is the more ductile: elongation 3% versus 2.5% for PEEK-GF30. PEEK GF20 is lighter (1.44 g/cm³ vs 1.51 g/cm³ for PEEK-GF30) and PEEK-GF30 is stiffer (10 GPa vs 7.5 GPa). On the shop floor, PEEK GF20 machines more easily (good vs fair) and PEEK-GF30 sits in a lower cost tier (high, $$$$) than PEEK GF20 (specialty, $$$$$).
PEEK GF20Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PEEK-GF30Choose it when strength drives the design, or when cost is the deciding factor.
PEEK GF20 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
Poisson's Ratio
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 R
Same in both: Hardness, Rockwell M 102 HRM
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 343°C649 °F · Glass Transition (Tg) 143°C289 °F · Water Absorption (24 h) 0.11% · Water Absorption (Saturation) 0.4%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Heat Deflection Temp. @ 1.8 MPa
Vicat Softening Point (B50)
Limiting Oxygen Index
Same in both: Max Service Temperature (continuous) 260°C500 °F · Min Service Temperature -60°C-76 °F · Heat Deflection Temp. @ 0.45 MPa 340°C644 °F · Max Service Temperature (short-term) 310°C590 °F
Electrical
Conductivity and insulation.
Dielectric Strength
Dielectric Constant (1 MHz)
Volume Resistivity
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Dissipation Factor (1 MHz) 0.005 · Surface Resistivity 1×10¹⁵ Ω · Comparative Tracking Index (CTI) 150 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
UV / Weathering Resistance
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%
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 GF20 | PEEK-GF30 |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| Injection molding | Yes | — |
| 3D printing | Yes | — |
| Default condition | Virgin | — |
| Relative cost | $$$$$ Specialty | $$$$ High |
| Min. machined wall | 0.8 mm | — |
| Best machined surface | Ra 0.8 µm | — |
| Chrome Plating (Plastic) | Yes | — |
| Conductive Coating | Yes | — |
| Dyeing (Nylon) | Yes | — |
| EMI Shielding Coating | Yes | — |
| Painting | Yes | — |
| Primer Coating | Yes | — |
| Soft Touch Coating | Yes | — |
| Spray Painting | Yes | — |
| Tinted Coating | Yes | — |
| UV Coating | Yes | — |
| Vacuum Metallization | Yes | — |
| Waterproof Coating | Yes | — |
PEEK GF20 vs PEEK-GF30 — frequently asked
Is PEEK-GF30 stronger than PEEK GF20?
Yes. PEEK-GF30 has a typical tensile strength of 165 MPa (23.9 ksi) against 140 MPa (20.3 ksi) for PEEK GF20 — about 18% more.
Which is cheaper, PEEK GF20 or PEEK-GF30?
PEEK-GF30 is the lower-cost material: it sits in the high tier ($$$$) while PEEK GF20 is specialty ($$$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, PEEK GF20 or PEEK-GF30?
PEEK GF20. Its machinability rates good (55/100) against fair (45/100) for PEEK-GF30; for welding the order is PEEK-GF30 first (fair, 35/100) then PEEK GF20 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in PEEK GF20 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.