Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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Moplen HP501H Product DataLyondellBasellPlastic Polypropylene · Yield strength: typical, tensile stress at yield ISO 527Plastic Polypropylene · Young's modulus (stiffness): typical, tensile modulus ISO 527Plastic Polypropylene · Density: typical, 23 °C ISO 1183-1Plastic Polypropylene · Max service temperature: HDT 0.45 MPa (ISO 75B), unannealed
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Engineering Polymers Part and Mold Design: Thermoplastics, A Design GuideCovestroPlastic Nylon PA66 · Poisson's ratio: base material: unfilled polyamide (PA), conditioned, maker design-guide family value (Covestro Table 3-1)
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Typical Engineering Properties of PolypropyleneINEOS Olefins & Polymers USAarchived copyPlastic Polypropylene · Poisson's ratio: base material: polypropylene homopolymer family (INEOS Olefins & Polymers USA, Typical Engineering Properties of Polypropylene)Plastic Polypropylene · Thermal conductivity: base material: polypropylene homopolymer family (INEOS Olefins & Polymers USA, Typical Engineering Properties of Polypropylene)Plastic Polypropylene · Thermal expansion: base material: polypropylene homopolymer family (INEOS Olefins & Polymers USA, Typical Engineering Properties of Polypropylene)
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.
Questions
Mechanical
Is Plastic Nylon PA66 stronger than Plastic Polypropylene?
Plastic Nylon PA66 is stronger: its yield strength is 85 MPa against 33 MPa for Plastic Polypropylene (2.58x).
Which is lighter, Plastic Nylon PA66 or Plastic Polypropylene?
Plastic Polypropylene is lighter: 900 kg/m³ against 1,130 kg/m³ for Plastic Nylon PA66.
Which is stiffer, Plastic Nylon PA66 or Plastic Polypropylene?
Plastic Nylon PA66 is stiffer: Young's modulus 3 GPa against 1.45 GPa for Plastic Polypropylene, so the same part in Plastic Nylon PA66 deflects less under the same load.
Which is lighter for the same job, Plastic Nylon PA66 or Plastic Polypropylene?
For the same stiffness or strength: Plastic Nylon PA66 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 Nylon PA66
Plastic Polypropylene
Stiff rod or tie (tension)
lighter
1.65x heavier
Stiff beam (bending)
lighter
15% heavier
Stiff panel or plate
lighter
1% heavier
Strong rod or tie
lighter
2.05x heavier
Strong beam
lighter
50% heavier
Strong panel or plate
lighter
28% 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).
Thermal
Which conducts heat better, Plastic Nylon PA66 or Plastic Polypropylene?
Plastic Nylon PA66 conducts heat better: 0.33 W/m·K against 0.195 W/m·K for Plastic Polypropylene.
Which expands less with temperature?
Plastic Polypropylene expands less: 90 µm/m·K against 98 µm/m·K for Plastic Nylon PA66.