Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
Try it on a partA bracket to run stress or thermal on, free in your browser
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
3
Engineering Polymers Part and Mold Design: Thermoplastics, A Design GuideCovestroarchived copyPlastic ABS (bulk/injection) · Poisson's ratio: typical, ABS family (Covestro Part and Mold Design guide, Table 3-1)
4
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 ABS (bulk/injection) stronger than Plastic Polypropylene?
Plastic ABS (bulk/injection) is stronger: its yield strength is 45 MPa against 33 MPa for Plastic Polypropylene (36%).
Which is lighter, Plastic ABS (bulk/injection) or Plastic Polypropylene?
Plastic Polypropylene is lighter: 900 kg/m³ against 1,040 kg/m³ for Plastic ABS (bulk/injection).
Which is stiffer, Plastic ABS (bulk/injection) or Plastic Polypropylene?
Plastic ABS (bulk/injection) is stiffer: Young's modulus 2.3 GPa against 1.45 GPa for Plastic Polypropylene, so the same part in Plastic ABS (bulk/injection) deflects less under the same load.
Which is lighter for the same job, Plastic ABS (bulk/injection) or Plastic Polypropylene?
For the same stiffness or strength: Plastic ABS (bulk/injection) is lighter for a stiff rod or tie (tension), stiff beam (bending), strong rod or tie, strong beam, strong panel or plate.
Part that must be
Plastic ABS (bulk/injection)
Plastic Polypropylene
Stiff rod or tie (tension)
lighter
37% heavier
Stiff beam (bending)
lighter
9% heavier
Stiff panel or plate
about equal
about equal
Strong rod or tie
lighter
18% heavier
Strong beam
lighter
6% heavier
Strong panel or plate
lighter
1% 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 ABS (bulk/injection) or Plastic Polypropylene?
Plastic Polypropylene conducts heat better: 0.195 W/m·K against 0.17 W/m·K for Plastic ABS (bulk/injection).
Which expands less with temperature?
Plastic Polypropylene expands less: 90 µm/m·K against 95 µm/m·K for Plastic ABS (bulk/injection).