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Concrete vs. Plastic PBT GF30

Compare Concrete vs. Plastic PBT GF30 strength, stiffness, weight and thermal properties.

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ConcreteCast
Plastic PBT GF30Bulk polymer (molded or machined)
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Mechanical
Yield strengthnot sourcednot given (tensile used)
Ultimate tensile strengthnot sourced140MPasourcestress at break, 23 °C
Compressive strength27.6MPasourcespecified compressive strength class (f'c), not a measured typicalnot sourced
Flexural strengthnot sourced210MPasourcetypical, 23 °C
Elongation at breaknot sourced3%sourcestrain at break, 23 °C
Young's modulus (stiffness)not sourced9.8GPasourcetypical, 23 °C
Density2,240–2,400kg/m³sourcerange for normalweight concrete1,530kg/m³sourcetypical
Strength to weightnot sourced91.5kN·m/kg
Stiffness to weightnot sourced6.41MN·m/kg
Poisson's ratio0.15–0.2sourcegeneral range at normal ambient conditions (overall 0.11-0.32)not sourced
Shear modulusnot sourcednot sourced
Bulk modulusnot sourcednot sourced
Speed of soundnot sourced2,531m/s
Thermal
Thermal conductivity0.9W/m·Ksourcetypical (comparative value)0.27W/m·Ksourcetypical (DIN 52612-1)
Thermal expansion8–12µm/m·Ksourcetypical range for portland cement concrete (aggregate dependent)25µm/m·Ksourcelongitudinal (flow), mean 23-55 °C
100 mm part over a 50 °C swing50µm growth2.5x less125µm growth
Specific heat900J/kg·Ksourcetypical (NIST guidance for thermal analysis)1,050J/kg·Ksourcetypical, 23 °C
Heats up and cools (diffusivity)0.431mm²/s2.56x faster0.168mm²/s
Thermal shock resistancenot sourcednot sourced
Melting pointnot sourced223°CsourceDSC (ISO 11357)
Max service temperature65°Csourcecode long-term temperature limit (ASME Code, concrete containments)205°CsourceHDT 1.8 MPa
Values forNormal-weight portland cement concrete, strength class f'c = 4000 psi (28 MPa) per NRMCA CIP 35; density NRMCA CIP 36; thermal conductivity USDA FPL Wood Handbook; service temperature ORNL/NRC reviewBASF 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

Which is lighter, Concrete or Plastic PBT GF30?

Plastic PBT GF30 is lighter: 1,530 kg/m³ against 2,320 kg/m³ for Concrete.

Which conducts heat better, Concrete or Plastic PBT GF30?

Concrete conducts heat better: 0.9 W/m·K against 0.27 W/m·K for Plastic PBT GF30.

Which expands less with temperature?

Concrete expands less: 10 µm/m·K against 25 µm/m·K for Plastic PBT GF30.

Among 72 materials

1k10k0.1110100Density (kg/m³)Young's modulus (GPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonAluminumSteelIronTitaniumSteel AISI 1018Stainless Steel 304Stainless Steel 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless Steel 303Stainless Steel 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelPCB Laminate FR-4SiliconCeramic Alumina 96%Ceramic Aluminum NitrideAluminum A380Aluminum 6063-T6Aluminum 1100-OAluminum ADC12Magnesium AZ91DSolder SAC305Plastic PPS GF40Plastic LCP GF30Plastic PBT GF30
Stiffness against density
1k10k101001kDensity (kg/m³)Yield strength (MPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonRubberAluminumSteelIronTitaniumSteel AISI 1018Stainless Steel 304Stainless Steel 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless Steel 303Stainless Steel 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Nickel Inconel 718Magnesium AZ31B-H24Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic PTFEPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLA Resin Elastic 50ASLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelBrickPCB Laminate FR-4SiliconCeramic Alumina 96%Aluminum A380Aluminum 6063-T6Aluminum 1100-OAluminum ADC12Magnesium AZ91DSolder SAC305Plastic PPS GF40Plastic LCP GF30Plastic PBT GF30
Strength against density

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