PEEK-450G vs PEEK-Medical-Grade
Polymer · grade comparison
PEEK-450G and PEEK-Medical-Grade are both polymer grades. Both yield at about 100 MPa — strength does not separate them. PEEK-450G is the more ductile: elongation 45% versus 30% for PEEK-Medical-Grade.
PEEK-450GChoose it when the part is bent, formed or impact-loaded.
PEEK-450G vs PEEK-Medical-Grade: 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.
Bulk Modulus
Poisson's Ratio
Yield Strength (0.2% offset)
Elongation at Break
Compressive Modulus
Shear Strength
Fracture Toughness (K_IC)
Izod Impact, Notched
Same in both: Elastic (Young's) Modulus 3.8 GPa0.55 Msi · Shear Modulus 1.4 GPa0.2 Msi · Tensile Strength (Ultimate) 100 MPa14.5 ksi · Compressive Strength 125 MPa18.1 ksi · Flexural Strength 165 MPa23.9 ksi · Flexural Modulus 4.1 GPa0.59 Msi · Hardness, Shore D 85 Shore D · Hardness, Rockwell M 99 HRM · Hardness, Rockwell R 126 HRR
Physical
Density and transition temperatures.
Water Absorption (24 h)
Refractive Index
Same in both: Density 1.3 g/cm³0.05 lb/in³ · Melting Temperature (Tm) 343°C649 °F · Glass Transition (Tg) 143°C289 °F · Water Absorption (Saturation) 0.45%
Thermal
How each material carries heat and how hot it can run.
Heat Deflection Temp. @ 0.45 MPa
Max Service Temperature (short-term)
Vicat Softening Point (B50)
Same in both: Thermal Conductivity 0.25 W/m·K0.14 BTU/hr·ft·°F · Specific Heat Capacity 1,340 J/kg·K0.32 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 47 µm/m·K26.1 µin/in·°F · Max Service Temperature (continuous) 250°C482 °F · Min Service Temperature -60°C-76 °F · Heat Deflection Temp. @ 1.8 MPa 152°C306 °F · Limiting Oxygen Index 35%
Electrical
Conductivity and insulation.
Dielectric Strength
Surface Resistivity
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Dielectric Constant (1 MHz) 3.2 · Dissipation Factor (1 MHz) 0.003 · Volume Resistivity 1×10¹⁶ Ω·cm · 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.
Weldability
Formability (cold)
Polishability
Melt Flow Rate
Same in both: Machinability 70 / 100 · Mold Shrinkage 1.2% · Processing Melt Temperature (typ.) 380°C716 °F · Mold Temperature (typ.) 190°C374 °F
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Same in both: Embodied Energy (primary production) 290 MJ/kg124,678 BTU/lb · Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Modulus of Resilience
Same in both: Specific Strength (UTS / density) 77 kN·m/kg · Specific Stiffness (E / density) 2.9 MN·m/kg · Thermal Diffusivity 0.1 mm²/s · 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-Medical-Grade |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
PEEK-450G vs PEEK-Medical-Grade — frequently asked
What is the difference between PEEK-450G and PEEK-Medical-Grade?
PEEK-450G and PEEK-Medical-Grade are both polymer grades. Both yield at about 100 MPa — strength does not separate them. PEEK-450G is the more ductile: elongation 45% versus 30% for PEEK-Medical-Grade.
Which is cheaper, PEEK-450G or PEEK-Medical-Grade?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, PEEK-450G or PEEK-Medical-Grade?
PEEK-Medical-Grade. Its weldability rates good (60/100) against good (55/100) for PEEK-450G.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PEEK-450G and PEEK-Medical-Grade 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.