Materials / Compare
Plastic PEEK vs. Plastic PETG Compare Plastic PEEK vs. Plastic PETG strength, stiffness, weight and thermal properties.
Plastic PLA Plastic PETG Plastic ABS Plastic TPU Plastic Nylon Plastic ABS (bulk/injection) Plastic Polycarbonate Plastic POM/Acetal Plastic Nylon PA6 Plastic Nylon PA66 Plastic PEEK Plastic PTFE Plastic UHMWPE Plastic HDPE Plastic Polypropylene Plastic PMMA Plastic PBT GF30 Plastic PPS GF40 Plastic LCP GF30 Rubber Wood Aluminum Aluminum 6061-T6 Aluminum 7075-T6 Aluminum 2024-T351 Aluminum 5052-H32 Aluminum 7050-T7451 Aluminum A380 Aluminum 6063-T6 Aluminum 1100-O Aluminum 3003-O Aluminum ADC12 Steel Steel AISI 1018 Steel AISI 1045 Steel AISI 4340 Steel A992 Iron Titanium Titanium Ti-6Al-4V Stainless Steel 304 Stainless Steel 316 Stainless Steel 303 Stainless Steel 17-4PH Brass C360 Brass C260 Copper C110 Copper C10100 Copper C12200 Glass Nickel Inconel 718 Magnesium AZ31B-H24 Magnesium AZ91D Zinc Zamak 3 FDM ASA FDM Polycarbonate FDM PAHT-CF FDM HIPS SLA Resin Standard SLA Resin Tough 2000 SLA Resin Elastic 50A SLS PA12 Nylon DMLS AlSi10Mg Aluminum DMLS Ti-6Al-4V ELI Titanium DMLS 316L Stainless Steel DMLS 17-4PH Stainless Steel Concrete Brick Plywood Drywall PCB Laminate FR-4 PCB Board FR-4, 2 copper planes Silicon Ceramic Alumina 96% Ceramic Aluminum Nitride Solder SAC305 Plastic PEEK Bulk polymer (molded or machined) Plastic PLA Plastic PETG Plastic ABS Plastic TPU Plastic Nylon Plastic ABS (bulk/injection) Plastic Polycarbonate Plastic POM/Acetal Plastic Nylon PA6 Plastic Nylon PA66 Plastic PEEK Plastic PTFE Plastic UHMWPE Plastic HDPE Plastic Polypropylene Plastic PMMA Plastic PBT GF30 Plastic PPS GF40 Plastic LCP GF30 Rubber Wood Aluminum Aluminum 6061-T6 Aluminum 7075-T6 Aluminum 2024-T351 Aluminum 5052-H32 Aluminum 7050-T7451 Aluminum A380 Aluminum 6063-T6 Aluminum 1100-O Aluminum 3003-O Aluminum ADC12 Steel Steel AISI 1018 Steel AISI 1045 Steel AISI 4340 Steel A992 Iron Titanium Titanium Ti-6Al-4V Stainless Steel 304 Stainless Steel 316 Stainless Steel 303 Stainless Steel 17-4PH Brass C360 Brass C260 Copper C110 Copper C10100 Copper C12200 Glass Nickel Inconel 718 Magnesium AZ31B-H24 Magnesium AZ91D Zinc Zamak 3 FDM ASA FDM Polycarbonate FDM PAHT-CF FDM HIPS SLA Resin Standard SLA Resin Tough 2000 SLA Resin Elastic 50A SLS PA12 Nylon DMLS AlSi10Mg Aluminum DMLS Ti-6Al-4V ELI Titanium DMLS 316L Stainless Steel DMLS 17-4PH Stainless Steel Concrete Brick Plywood Drywall PCB Laminate FR-4 PCB Board FR-4, 2 copper planes Silicon Ceramic Alumina 96% Ceramic Aluminum Nitride Solder SAC305 Plastic PETG 3D printed (FDM) Mechanical Plastic PEEK Plastic PETG Yield strength 98 MPa 2.12x stronger 46.2 MPa Ultimate tensile strength not stated (yield given) 46.2 MPa Compressive strength 125 MPa not sourced Flexural strength 165 MPa 78.9 MPa Elongation at break 25 % 3.29x more ductile 7.6 % Young's modulus (stiffness) 4 GPa 2.06x stiffer 1.94 GPa Density 1,300 kg/m³ 1,270 kg/m³ Strength to weight 75.4 kN·m/kg 2.07x higher 36.4 kN·m/kg Stiffness to weight 3.08 MN·m/kg 2.02x higher 1.53 MN·m/kg Poisson's ratio 0.38 not sourced Shear modulus 1.45 GPa not sourced Bulk modulus 5.56 GPa not sourced Speed of sound 1,754 m/s 42% faster 1,236 m/s
1k 10k 0.1 1 10 100 Density (kg/m³) Young's modulus (GPa) Plastic PLA Plastic ABS Plastic TPU Plastic Nylon Wood Aluminum Steel Iron Titanium Steel AISI 1018 Stainless Steel 304 Stainless Steel 316 Aluminum 6061-T6 Aluminum 7075-T6 Brass C360 Copper C110 Copper C10100 Copper C12200 Glass Steel AISI 1045 Steel AISI 4340 Steel A992 Stainless Steel 303 Stainless Steel 17-4PH Aluminum 2024-T351 Aluminum 5052-H32 Aluminum 7050-T7451 Titanium Ti-6Al-4V Brass C260 Nickel Inconel 718 Magnesium AZ31B-H24 Zinc Zamak 3 Plastic ABS (bulk/injection) Plastic Polycarbonate Plastic POM/Acetal Plastic Nylon PA6 Plastic Nylon PA66 Plastic UHMWPE Plastic HDPE Plastic Polypropylene Plastic PMMA FDM ASA FDM Polycarbonate FDM PAHT-CF FDM HIPS SLA Resin Standard SLA Resin Tough 2000 SLS PA12 Nylon DMLS AlSi10Mg Aluminum DMLS Ti-6Al-4V ELI Titanium DMLS 316L Stainless Steel DMLS 17-4PH Stainless Steel Concrete PCB Laminate FR-4 Silicon Ceramic Alumina 96% Ceramic Aluminum Nitride Aluminum A380 Aluminum 6063-T6 Aluminum 1100-O Aluminum 3003-O Aluminum ADC12 Magnesium AZ91D Solder SAC305 Plastic PBT GF30 Plastic PPS GF40 Plastic LCP GF30 Plastic PEEK Plastic PETG Stiffness against densityHigher and further left: stiffer for its weight 1k 10k 10 100 1k Density (kg/m³) Yield strength (MPa) Plastic PLA Plastic ABS Plastic TPU Plastic Nylon Rubber Wood Aluminum Steel Iron Titanium Steel AISI 1018 Stainless Steel 304 Stainless Steel 316 Aluminum 6061-T6 Aluminum 7075-T6 Brass C360 Copper C110 Copper C10100 Copper C12200 Glass Steel AISI 1045 Steel AISI 4340 Steel A992 Stainless Steel 303 Stainless Steel 17-4PH Aluminum 2024-T351 Aluminum 5052-H32 Aluminum 7050-T7451 Titanium Ti-6Al-4V Brass C260 Nickel Inconel 718 Magnesium AZ31B-H24 Zinc Zamak 3 Plastic ABS (bulk/injection) Plastic Polycarbonate Plastic POM/Acetal Plastic Nylon PA6 Plastic Nylon PA66 Plastic PTFE Plastic UHMWPE Plastic HDPE Plastic Polypropylene Plastic PMMA FDM ASA FDM Polycarbonate FDM PAHT-CF FDM HIPS SLA Resin Standard SLA Resin Tough 2000 SLA Resin Elastic 50A SLS PA12 Nylon DMLS AlSi10Mg Aluminum DMLS Ti-6Al-4V ELI Titanium DMLS 316L Stainless Steel DMLS 17-4PH Stainless Steel Brick PCB Laminate FR-4 Silicon Ceramic Alumina 96% Aluminum A380 Aluminum 6063-T6 Aluminum 1100-O Aluminum 3003-O Aluminum ADC12 Magnesium AZ91D Solder SAC305 Plastic PBT GF30 Plastic PPS GF40 Plastic LCP GF30 Plastic PEEK Plastic PETG Strength against densityHigher and further left: stronger for its weight
Thermal Plastic PEEK Plastic PETG Thermal conductivity 0.29 W/m·K 38% more heat through a fin base material 0.21 W/m·K Thermal expansion 55 µm/m·K base material 51 µm/m·K 100 mm part over a 50 °C swing 275 µm growth 255 µm growth 8% less Specific heat 2,200 J/kg·K 1.69x higher base material 1,300 J/kg·K Heats up and cools (diffusivity) 0.101 mm²/s 0.127 mm²/s 25% faster Thermal shock resistance 80.1 W/m not sourced Melting point 343 °C not sourced Glass transition onset 143 °C 65.6 °C higher 77.4 °C Max service temperature UL 746B RTI 240 °C HDT 0.455 MPa 76.2 °C
1k 10k 0.1 1 10 100 Density (kg/m³) Thermal conductivity (W/m·K) Plastic PLA Plastic ABS Plastic Nylon Rubber Wood Aluminum Steel Iron Titanium Steel AISI 1018 Stainless Steel 304 Stainless Steel 316 Aluminum 6061-T6 Aluminum 7075-T6 Brass C360 Copper C110 Copper C10100 Copper C12200 Glass Steel AISI 1045 Steel AISI 4340 Steel A992 Stainless Steel 303 Stainless Steel 17-4PH Aluminum 2024-T351 Aluminum 5052-H32 Aluminum 7050-T7451 Titanium Ti-6Al-4V Brass C260 Nickel Inconel 718 Magnesium AZ31B-H24 Zinc Zamak 3 Plastic ABS (bulk/injection) Plastic Polycarbonate Plastic POM/Acetal Plastic Nylon PA6 Plastic Nylon PA66 Plastic PTFE Plastic UHMWPE Plastic HDPE Plastic Polypropylene Plastic PMMA FDM ASA FDM Polycarbonate FDM HIPS SLA Resin Standard DMLS AlSi10Mg Aluminum DMLS Ti-6Al-4V ELI Titanium DMLS 316L Stainless Steel DMLS 17-4PH Stainless Steel Concrete Brick PCB Laminate FR-4 Silicon Ceramic Alumina 96% Ceramic Aluminum Nitride Aluminum A380 Aluminum 6063-T6 Aluminum 1100-O Aluminum 3003-O Aluminum ADC12 Magnesium AZ91D Solder SAC305 Plastic PBT GF30 Plastic PPS GF40 Plastic LCP GF30 Plastic PEEK Plastic PETG Thermal conductivity against densityHigher and further left: spreads more heat for its weight 0.1 1 10 100 10 100 Thermal conductivity (W/m·K) Thermal expansion (µm/m·K) Plastic ABS Plastic Nylon Wood Aluminum Steel Iron Titanium Steel AISI 1018 Stainless Steel 304 Stainless Steel 316 Aluminum 6061-T6 Aluminum 7075-T6 Brass C360 Copper C110 Copper C10100 Copper C12200 Glass Steel AISI 1045 Steel AISI 4340 Steel A992 Stainless Steel 303 Stainless Steel 17-4PH Aluminum 2024-T351 Aluminum 5052-H32 Aluminum 7050-T7451 Titanium Ti-6Al-4V Brass C260 Nickel Inconel 718 Magnesium AZ31B-H24 Zinc Zamak 3 Plastic ABS (bulk/injection) Plastic Polycarbonate Plastic POM/Acetal Plastic Nylon PA6 Plastic Nylon PA66 Plastic PTFE Plastic UHMWPE Plastic HDPE Plastic Polypropylene Plastic PMMA FDM ASA FDM Polycarbonate FDM HIPS SLA Resin Standard DMLS AlSi10Mg Aluminum DMLS Ti-6Al-4V ELI Titanium DMLS 316L Stainless Steel DMLS 17-4PH Stainless Steel Concrete Brick Plywood PCB Laminate FR-4 Silicon Ceramic Alumina 96% Ceramic Aluminum Nitride Aluminum A380 Aluminum 6063-T6 Aluminum 1100-O Aluminum 3003-O Aluminum ADC12 Magnesium AZ91D Solder SAC305 Plastic PBT GF30 Plastic PPS GF40 Plastic LCP GF30 Plastic PEEK Plastic PETG Thermal expansion against thermal conductivityLower and further right: warps less when heated
Sources 5 documents: Victrex, UltiMaker, Eastman
Plastic PEEK Victrex PEEK 450G (unreinforced, injection moulded), Victrex TDS rev. March 2026; Poisson from Victrex fluid-management flyer (2020-07)
Plastic PETG Ultimaker PETG, 3D-printed specimens, XY (flat); Ultimaker S5 Pro, engineering intent profile, 0.15 mm layer height, AA 0.4 print core, 100% infill, Cura 4.9, printed one-at-a-time, conditioned >=24 h at room temperature. TDS v1.00, April 29, 2022. 1 VICTREX PEEK 450G Technical Data Sheet Victrex Plastic PEEK · Yield strength: typical, tensile yieldPlastic PEEK · Compressive strength: typical, 23 CPlastic PEEK · Flexural strength: typical, flexural stress at yield, 23 CPlastic PEEK · Elongation at break: typical, at breakPlastic PEEK · Young's modulus (stiffness): typical (nominal)Plastic PEEK · Density: typical (crystalline)Plastic PEEK · Thermal conductivity: typical, average, 23 CPlastic PEEK · Thermal expansion: average of flow/cross-flow, below Tg (<143 C)Plastic PEEK · Melting point: typical, DSCPlastic PEEK · Glass transition: onset (midpoint 150 C)Plastic PEEK · Max service temperature: UL 746B RTI, mechanical strength (continuous use index)
2 Ultimaker PETG Technical Data Sheet, v1.00 UltiMaker archived copy Plastic PETG · Yield strength: typicalPlastic PETG · Ultimate tensile strength: typical, peak stress (= stress at yield)Plastic PETG · Flexural strength: typicalPlastic PETG · Elongation at break: typicalPlastic PETG · Young's modulus (stiffness): typicalPlastic PETG · Density: typicalPlastic PETG · Glass transition: typicalPlastic PETG · Max service temperature: HDT 0.455 MPa (printed specimens)3 VICTREX PEEK for Use in Fluid Management (2020) Victrex Plastic PEEK · Poisson's ratio: typical
4 Eastar Copolyester 6763 Product Data Sheet Eastman Plastic PETG · Thermal conductivity: base material: Eastman Eastar Copolyester 6763 (PETG), typicalPlastic PETG · Thermal expansion: base material: Eastman Eastar Copolyester 6763 (PETG), typicalPlastic PETG · Specific heat: base material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed)
5 VICTREX PEEK 450G Technical Data Sheet (2012) Victrex archived copy Plastic PEEK · Specific heat: typical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012)Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Plastic PETG is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions Mechanical Is Plastic PEEK stronger than Plastic PETG? Plastic PEEK is stronger: its yield strength is 98 MPa against 46.2 MPa for Plastic PETG (2.12x).
Which is lighter, Plastic PEEK or Plastic PETG? Plastic PETG is lighter: 1,270 kg/m³ against 1,300 kg/m³ for Plastic PEEK.
Which is stiffer, Plastic PEEK or Plastic PETG? Plastic PEEK is stiffer: Young's modulus 4 GPa against 1.94 GPa for Plastic PETG, so the same part in Plastic PEEK deflects less under the same load.
Which is lighter for the same job, Plastic PEEK or Plastic PETG? For the same stiffness or strength: Plastic PEEK is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
Part that must be Plastic PEEK Plastic PETG Stiff rod or tie (tension) lighter 2.02x heavier Stiff beam (bending) lighter 40% heavier Stiff panel or plate lighter 24% heavier Strong rod or tie lighter 2.07x heavier Strong beam lighter 1.61x heavier Strong panel or plate lighter 42% heavier
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which is more ductile, Plastic PEEK or Plastic PETG? Plastic PEEK stretches further before it breaks: 25% elongation at break against 7.6% for Plastic PETG.
Thermal Which conducts heat better, Plastic PEEK or Plastic PETG? Plastic PEEK conducts heat better: 0.29 W/m·K against 0.21 W/m·K for Plastic PETG.
Which expands less with temperature? Plastic PETG expands less: 51 µm/m·K against 55 µm/m·K for Plastic PEEK.