PEEK-450G BLK vs PEEK-450G GF30
Polymer · PEEK-450G grade comparison
PEEK-450G BLK and PEEK-450G GF30 are two grades of the same polymer grade, PEEK-450G: BLK (450G Black) versus GF30 (450GL30). The chemistry is identical, so every difference below comes from the condition. PEEK-450G GF30 is the stronger of the two: tensile strength 165 MPa (23.9 ksi) against 100 MPa (14.5 ksi) for PEEK-450G BLK, about 65% more. In exchange, PEEK-450G BLK is the more ductile: elongation 40% versus 2.5% for PEEK-450G GF30. PEEK-450G BLK is lighter (1.3 g/cm³ vs 1.51 g/cm³ for PEEK-450G GF30) and PEEK-450G GF30 is stiffer (10.5 GPa vs 3.8 GPa). On the shop floor, PEEK-450G BLK machines more easily (very good vs fair).
PEEK-450G BLKChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PEEK-450G GF30Choose it when strength drives the design.
PEEK-450G BLK vs PEEK-450G 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)
Elongation at Break
Compressive Strength
Flexural Strength
Flexural Modulus
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Rockwell M
Same in both: Shear Modulus 1.4 GPa0.2 Msi · Bulk Modulus 5 GPa0.73 Msi · Poisson's Ratio 0.38 · Yield Strength (0.2% offset) 100 MPa14.5 ksi · Compressive Modulus 3.5 GPa0.51 Msi · Shear Strength 55 MPa8 ksi · Hardness, Shore D 85 Shore D · Hardness, Rockwell R 126 HRR
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) 0.12% · Water Absorption (Saturation) 0.45% · Refractive Index 1.65
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. @ 1.8 MPa
Same in both: Specific Heat Capacity 1,340 J/kg·K0.32 BTU/lb·°F · Min Service Temperature -60°C-76 °F · Heat Deflection Temp. @ 0.45 MPa 290°C554 °F · Limiting Oxygen Index 35% · Max Service Temperature (short-term) 310°C590 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Dielectric Strength 20 kV/mm508 V/mil · Dielectric Constant (1 MHz) 3.2 · Dissipation Factor (1 MHz) 0.003 · Volume Resistivity 1×10¹⁶ Ω·cm · Surface Resistivity 1×10¹⁶ Ω · Comparative Tracking Index (CTI) 150 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
UV / Weathering Resistance
Same in both: Corrosion Resistance 92 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Mold Shrinkage
Same in both: Weldability 55 / 100 · Polishability 70 / 100 · Melt Flow Rate 3 g/10 min · Processing Melt Temperature (typ.) 380°C716 °F · Mold Temperature (typ.) 190°C374 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 290 MJ/kg124,678 BTU/lb · Embodied Carbon (primary production) 16 kg CO₂/kg · Embodied Water 500 L/kg59.9 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.
PEEK-450G BLK vs PEEK-450G GF30 — frequently asked
Is PEEK-450G GF30 stronger than PEEK-450G BLK?
Yes. PEEK-450G GF30 has a typical tensile strength of 165 MPa (23.9 ksi) against 100 MPa (14.5 ksi) for PEEK-450G BLK — about 65% more.
Which grade does FabDigit quote by default, BLK or GF30?
Specify the condition in the material field or the drawing note; FabDigit prices the quote for the state you call out.
Which is easier to machine, PEEK-450G BLK or PEEK-450G GF30?
PEEK-450G BLK. Its machinability rates very good (70/100) against fair (45/100) for PEEK-450G GF30.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PEEK-450G BLK and PEEK-450G 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.