Plastic ABS (bulk/injection) vs. Plastic PBT GF30

Compare Plastic ABS (bulk/injection) vs. Plastic PBT GF30 strength, stiffness, weight and thermal properties.

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Plastic ABS (bulk/injection)Bulk polymer (molded or machined)

Plastic PBT GF30Bulk polymer (molded or machined)

Mechanical
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Yield strength	45MPasourcetypical, tensile stress at yield 23 °C	not given (tensile used)
Ultimate tensile strength	not sourced	140MPasourcestress at break, 23 °C
Flexural strength	65MPasourcetypical, 23 °C	210MPasourcetypical, 23 °C3.23x stronger in bending
Elongation at break	10%sourcenominal strain at break, 23 °C	3%sourcestrain at break, 23 °C
Young's modulus (stiffness)	2.3GPasourcetypical	9.8GPasourcetypical, 23 °C
Density	1,040kg/m³sourcetypical47% lighter	1,530kg/m³sourcetypical
Strength to weight	43.3kN·m/kg	91.5kN·m/kg2.11x higher
Stiffness to weight	2.21MN·m/kg	6.41MN·m/kg2.9x higher
Poisson's ratio	0.39sourcetypical, ABS family (Covestro Part and Mold Design guide, Table 3-1)	not sourced
Shear modulus	0.827GPa	not sourced
Bulk modulus	3.48GPa	not sourced
Speed of sound	1,487m/s	2,531m/s
Thermal
Thermal conductivity	0.17W/m·Ksourcetypical	0.27W/m·Ksourcetypical (DIN 52612-1)
Thermal expansion	80–110µm/m·Ksourcerange	25µm/m·Ksourcelongitudinal (flow), mean 23-55 °C
100 mm part over a 50 °C swing	475µm growth	125µm growth3.8x less
Specific heat	not sourced	1,050J/kg·Ksourcetypical, 23 °C
Heats up and cools (diffusivity)	not sourced	0.168mm²/s
Thermal shock resistance	21.4W/m	not sourced
Melting point	not sourced	223°CsourceDSC (ISO 11357)
Max service temperature	94°CsourceHDT 1.8 MPa (annealed 4 h/80 °C)	205°CsourceHDT 1.8 MPa
Values for	INEOS Styrolution Terluran GP-22 general-purpose injection-molding ABS, ISO typical values (TDS revision 08/01/2022)	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.

Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.

Questions

Is Plastic ABS (bulk/injection) stronger than Plastic PBT GF30?

Plastic PBT GF30 is stronger: its tensile strength is 140 MPa against yield strength 45 MPa for Plastic ABS (bulk/injection) (3.11x).

Which is lighter, Plastic ABS (bulk/injection) or Plastic PBT GF30?

Plastic ABS (bulk/injection) is lighter: 1,040 kg/m³ against 1,530 kg/m³ for Plastic PBT GF30.

Which is stiffer, Plastic ABS (bulk/injection) or Plastic PBT GF30?

Plastic PBT GF30 is stiffer: Young's modulus 9.8 GPa against 2.3 GPa for Plastic ABS (bulk/injection), so the same part in Plastic PBT GF30 deflects less under the same load.

Which is lighter for the same job, Plastic ABS (bulk/injection) 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 ABS (bulk/injection)	Plastic PBT GF30
Stiff rod or tie (tension)	2.9x heavier	lighter
Stiff beam (bending)	40% heavier	lighter
Stiff panel or plate	10% heavier	lighter
Strong rod or tie	2.11x heavier	lighter
Strong beam	45% heavier	lighter
Strong panel or plate	20% 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).

Which conducts heat better, Plastic ABS (bulk/injection) or Plastic PBT GF30?

Plastic PBT GF30 conducts heat better: 0.27 W/m·K against 0.17 W/m·K for Plastic ABS (bulk/injection).

Which expands less with temperature?

Plastic PBT GF30 expands less: 25 µm/m·K against 95 µm/m·K for Plastic ABS (bulk/injection).

Among 72 materials

Stiffness against density

Strength against density