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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Sources3 documents: LyondellBasell, BASF, INEOS Olefins & Polymers USA
Plastic HDPE
LyondellBasell Hostalen 23050 B high density polyethylene, typical ISO values
Plastic PBT GF30
BASF Ultradur B 4300 G6 (PBT, 30% glass fibre), injection moulding grade; product information sheet 09/2026, typical values for uncoloured product at 23 °C.
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Hostalen 23050 B Product DataLyondellBasellPlastic HDPE · Yield strength: typical, tensile stress at yield 23 °C, 50 mm/min ISO 527Plastic HDPE · Young's modulus (stiffness): typical, tensile modulus 23 °C ISO 527Plastic HDPE · Density: typical, ISO 1183
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Ultradur B 4300 G6 Product InformationBASFPlastic PBT GF30 · Ultimate tensile strength: stress at break, 23 °CPlastic PBT GF30 · Flexural strength: typical, 23 °CPlastic PBT GF30 · Elongation at break: strain at break, 23 °CPlastic PBT GF30 · Young's modulus (stiffness): typical, 23 °CPlastic PBT GF30 · Density: typicalPlastic PBT GF30 · Thermal conductivity: typical (DIN 52612-1)Plastic PBT GF30 · Thermal expansion: longitudinal (flow), mean 23-55 °CPlastic PBT GF30 · Specific heat: typical, 23 °CPlastic PBT GF30 · Melting point: DSC (ISO 11357)Plastic PBT GF30 · Max service temperature: HDT 1.8 MPa
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Typical Engineering Properties of High Density PolyethyleneINEOS Olefins & Polymers USAarchived copyPlastic HDPE · Poisson's ratio: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)Plastic HDPE · Thermal conductivity: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)Plastic HDPE · Thermal expansion: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)Plastic HDPE · Specific heat: base material: high-density polyethylene family (INEOS Olefins & Polymers USA, Typical Engineering Properties of HDPE)
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 HDPE stronger than Plastic PBT GF30?
Plastic PBT GF30 is stronger: its tensile strength is 140 MPa against yield strength 24 MPa for Plastic HDPE (5.83x).
Which is lighter, Plastic HDPE or Plastic PBT GF30?
Plastic HDPE is lighter: 950 kg/m³ against 1,530 kg/m³ for Plastic PBT GF30.
Which is stiffer, Plastic HDPE or Plastic PBT GF30?
Plastic PBT GF30 is stiffer: Young's modulus 9.8 GPa against 0.9 GPa for Plastic HDPE, so the same part in Plastic PBT GF30 deflects less under the same load.
Which is lighter for the same job, Plastic HDPE or Plastic PBT GF30?
For the same stiffness or strength: Plastic PBT GF30 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 HDPE
Plastic PBT GF30
Stiff rod or tie (tension)
6.76x heavier
lighter
Stiff beam (bending)
2.05x heavier
lighter
Stiff panel or plate
38% heavier
lighter
Strong rod or tie
3.62x heavier
lighter
Strong beam
2.01x heavier
lighter
Strong panel or plate
50% heavier
lighter
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 HDPE or Plastic PBT GF30?
Plastic HDPE conducts heat better: 0.445 W/m·K against 0.27 W/m·K for Plastic PBT GF30.
Which expands less with temperature?
Plastic PBT GF30 expands less: 25 µm/m·K against 120 µm/m·K for Plastic HDPE.