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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BASF Ultramid B3S (PA6, unreinforced injection-moulding grade), Product Information 02/2026, dry values (ISO methods)
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.
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
3
Engineering Polymers Part and Mold Design: Thermoplastics, A Design GuideCovestroPlastic Nylon PA6 · Poisson's ratio: base material: unfilled polyamide (PA), conditioned, maker design-guide family value (Covestro Table 3-1)
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 PA6 stronger than Plastic PBT GF30?
Plastic PBT GF30 is stronger: its tensile strength is 140 MPa against yield strength 90 MPa for Plastic Nylon PA6 (1.56x).
Which is lighter, Plastic Nylon PA6 or Plastic PBT GF30?
Plastic Nylon PA6 is lighter: 1,130 kg/m³ against 1,530 kg/m³ for Plastic PBT GF30.
Which is stiffer, Plastic Nylon PA6 or Plastic PBT GF30?
Plastic PBT GF30 is stiffer: Young's modulus 9.8 GPa against 3.5 GPa for Plastic Nylon PA6, so the same part in Plastic PBT GF30 deflects less under the same load.
Which is lighter for the same job, Plastic Nylon PA6 or Plastic PBT GF30?
For the same stiffness or strength: Plastic Nylon PA6 is lighter for a strong panel or plate; Plastic PBT GF30 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie.
Part that must be
Plastic Nylon PA6
Plastic PBT GF30
Stiff rod or tie (tension)
2.07x heavier
lighter
Stiff beam (bending)
24% heavier
lighter
Stiff panel or plate
4% heavier
lighter
Strong rod or tie
15% heavier
lighter
Strong beam
about equal
about equal
Strong panel or plate
lighter
9% 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 is more ductile, Plastic Nylon PA6 or Plastic PBT GF30?
Plastic Nylon PA6 stretches further before it breaks: 10% elongation at break against 3% for Plastic PBT GF30.
Thermal
Which conducts heat better, Plastic Nylon PA6 or Plastic PBT GF30?
Plastic Nylon PA6 conducts heat better: 0.33 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 102 µm/m·K for Plastic Nylon PA6.