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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Covestro Makrolon 2405 general-purpose PC (MVR 19), Covestro technical datasheet version 2026-09-28, typical values
Plastic Polypropylene
LyondellBasell Moplen HP501H polypropylene homopolymer (general purpose), typical ISO values
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Makrolon 2405 Technical Data SheetCovestroPlastic Polycarbonate · Yield strength: typical, tensile yieldPlastic Polycarbonate · Ultimate tensile strength: typical, stress at breakPlastic Polycarbonate · Flexural strength: typical, flexural strengthPlastic Polycarbonate · Elongation at break: typical, strain at breakPlastic Polycarbonate · Young's modulus (stiffness): typicalPlastic Polycarbonate · Density: typicalPlastic Polycarbonate · Thermal conductivity: typical, through-plane, 23 CPlastic Polycarbonate · Thermal expansion: typical, 23-55 C, parallel and normalPlastic Polycarbonate · Glass transition: typical, DSC 10 C/minPlastic Polycarbonate · Max service temperature: UL 746B RTI, tensile strength, 1.5 mm
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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 GuideCovestroarchived copyPlastic Polycarbonate · Poisson's ratio: typical, polycarbonate family (Covestro Part and Mold Design guide, 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)
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Makrolon 2405 Data Sheet, ASTM valuesBayer MaterialSciencearchived copyPlastic Polycarbonate · Specific heat: typical (guide value), Bayer ASTM datasheet for Makrolon 2405, ASTM D 2766
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 Polycarbonate stronger than Plastic Polypropylene?
Plastic Polycarbonate is stronger: its yield strength is 65 MPa against 33 MPa for Plastic Polypropylene (1.97x).
Which is lighter, Plastic Polycarbonate or Plastic Polypropylene?
Plastic Polypropylene is lighter: 900 kg/m³ against 1,200 kg/m³ for Plastic Polycarbonate.
Which is stiffer, Plastic Polycarbonate or Plastic Polypropylene?
Plastic Polycarbonate is stiffer: Young's modulus 2.4 GPa against 1.45 GPa for Plastic Polypropylene, so the same part in Plastic Polycarbonate deflects less under the same load.
Which is lighter for the same job, Plastic Polycarbonate or Plastic Polypropylene?
For the same stiffness or strength: Plastic Polycarbonate is lighter for a stiff rod or tie (tension), strong rod or tie, strong beam, strong panel or plate; Plastic Polypropylene is lighter for a stiff beam (bending), stiff panel or plate.
Part that must be
Plastic Polycarbonate
Plastic Polypropylene
Stiff rod or tie (tension)
lighter
24% heavier
Stiff beam (bending)
4% heavier
lighter
Stiff panel or plate
13% heavier
lighter
Strong rod or tie
lighter
48% heavier
Strong beam
lighter
18% heavier
Strong panel or plate
lighter
5% 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 Polycarbonate or Plastic Polypropylene?
Plastic Polycarbonate conducts heat better: 0.2 W/m·K against 0.195 W/m·K for Plastic Polypropylene.
Which expands less with temperature?
Plastic Polycarbonate expands less: 65 µm/m·K against 90 µm/m·K for Plastic Polypropylene.