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Magnesium AZ91D vs. Plastic HDPE Compare Magnesium AZ91D vs. Plastic HDPE strength, stiffness, weight and thermal properties.
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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 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 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 Silicon Ceramic Alumina 96% Ceramic Aluminum Nitride Solder SAC305 Magnesium AZ91D Cast 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 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 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 Silicon Ceramic Alumina 96% Ceramic Aluminum Nitride Solder SAC305 Plastic HDPE Bulk polymer (molded or machined) Try it on a partA bracket to run stress or thermal on, free in your browser Open in LessCAD Open in LessCAD Mechanical Yield strength 150 MPa source typical, 0.2% tensile yield, ambient temperature 24 MPa source typical, tensile stress at yield 23 °C, 50 mm/min ISO 527 Ultimate tensile strength 230 MPa source typical, ambient temperature not sourced Elongation at break 3 % source typical, ambient temperature not sourced Young's modulus (stiffness) 45 GPa source typical 0.9 GPa source typical, tensile modulus 23 °C ISO 527 Density 1,810 kg/m³ source typical 950 kg/m³ source typical, ISO 1183 Strength to weight 82.9 kN·m/kg 3.28x higher 25.3 kN·m/kg Stiffness to weight 24.9 MN·m/kg 26.2x higher 0.947 MN·m/kg Poisson's ratio 0.35 source base material: AZ91C casting (MIL-HDBK-5J handbook physical constant) 0.4–0.45 source base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE) Shear modulus 16.7 GPa 52.8x stiffer in shear 0.316 GPa Bulk modulus 50 GPa 2 GPa Speed of sound 4,986 m/s 973 m/s Thermal Thermal conductivity 72 W/m·K source typical 0.4–0.49 W/m·K source base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE) Thermal expansion 25 µm/m·K source typical, temperature range not stated 120 µm/m·K source base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE) 100 mm part over a 50 °C swing 125 µm growth 4.8x less 600 µm growth Specific heat 1,050 J/kg·K source typical 2,250 J/kg·K source base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE) Heats up and cools (diffusivity) 37.9 mm²/s 182x faster 0.208 mm²/s Thermal shock resistance 6,240 W/m 110x more resistant 56.9 W/m Melting point 470–595 °C source melting range not sourced Values for ELEKTRON AZ91D magnesium die-casting alloy, as cast; Magnesium Elektron datasheet 475 (7/01), typical properties; Poisson from MIL-HDBK-5J for AZ91C castings. LyondellBasell Hostalen 23050 B high density polyethylene, typical ISO values
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions Is Magnesium AZ91D stronger than Plastic HDPE? Magnesium AZ91D is stronger: its yield strength is 150 MPa against 24 MPa for Plastic HDPE (6.25x).
Which is lighter, Magnesium AZ91D or Plastic HDPE? Plastic HDPE is lighter: 950 kg/m³ against 1,810 kg/m³ for Magnesium AZ91D.
Which is stiffer, Magnesium AZ91D or Plastic HDPE? Magnesium AZ91D is stiffer: Young's modulus 45 GPa against 0.9 GPa for Plastic HDPE, so the same part in Magnesium AZ91D deflects less under the same load.
Which is lighter for the same job, Magnesium AZ91D or Plastic HDPE? For the same stiffness or strength: Magnesium AZ91D 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 Magnesium AZ91D Plastic HDPE Stiff rod or tie (tension) lighter 26.2x heavier Stiff beam (bending) lighter 3.71x heavier Stiff panel or plate lighter 1.93x heavier Strong rod or tie lighter 3.28x heavier Strong beam lighter 1.78x heavier Strong panel or plate lighter 31% 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 conducts heat better, Magnesium AZ91D or Plastic HDPE? Magnesium AZ91D conducts heat better: 72 W/m·K against 0.445 W/m·K for Plastic HDPE.
Which expands less with temperature? Magnesium AZ91D expands less: 25 µm/m·K against 120 µm/m·K for Plastic HDPE.
Among 72 materials 1k 10k 0.1 1 10 100 Density (kg/m³) Young's modulus (GPa) Plastic PLA Plastic PETG Plastic ABS Plastic TPU Plastic Nylon Aluminum Steel Iron Titanium Steel AISI 1018 Stainless Steel 304 Stainless Steel 316 Aluminum 6061-T6 Aluminum 7075-T6 Brass C360 Copper C110 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 PEEK Plastic UHMWPE Plastic Polypropylene Plastic PMMA FDM ASA FDM Polycarbonate FDM PAHT-CF FDM HIPS 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 PCB Laminate FR-4 Silicon Ceramic Alumina 96% Ceramic Aluminum Nitride Aluminum A380 Aluminum 6063-T6 Aluminum 1100-O Aluminum ADC12 Solder SAC305 Plastic PBT GF30 Plastic PPS GF40 Plastic LCP GF30 Magnesium AZ91D Plastic HDPE Stiffness against density 1k 10k 10 100 1k Density (kg/m³) Yield strength (MPa) Plastic PLA Plastic PETG Plastic ABS Plastic TPU Plastic Nylon Rubber Aluminum Steel Iron Titanium Steel AISI 1018 Stainless Steel 304 Stainless Steel 316 Aluminum 6061-T6 Aluminum 7075-T6 Brass C360 Copper C110 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 PEEK Plastic PTFE Plastic UHMWPE Plastic Polypropylene Plastic PMMA FDM ASA FDM Polycarbonate FDM PAHT-CF FDM HIPS 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 ADC12 Solder SAC305 Plastic PBT GF30 Plastic PPS GF40 Plastic LCP GF30 Magnesium AZ91D Plastic HDPE Strength against density