Plastic LCP GF30 vs. Plastic PETG

Compare Plastic LCP GF30 vs. Plastic PETG strength, stiffness, weight and thermal properties.

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Plastic LCP GF30Bulk polymer (molded or machined)

Mechanical
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Yield strength	not given (tensile used)	46.2MPasourcetypical
Ultimate tensile strength	115MPasourcetensile strength (ISO 527)	46.2MPasourcetypical, peak stress (= stress at yield)
Flexural strength	184MPasourcetypical (ISO 178)	78.9MPasourcetypical
Elongation at break	1.5%sourcetensile elongation (ISO 527)	7.6%sourcetypical
Young's modulus (stiffness)	11.5GPasourcetensile modulus (ISO 527)	1.94GPasourcetypical
Density	1,610kg/m³sourcetypical	1,270kg/m³sourcetypical27% lighter
Strength to weight	71.4kN·m/kg1.96x higher	36.4kN·m/kg
Stiffness to weight	7.14MN·m/kg4.68x higher	1.53MN·m/kg
Poisson's ratio	not sourced	not sourced
Shear modulus	not sourced	not sourced
Bulk modulus	not sourced	not sourced
Speed of sound	2,673m/s	1,236m/s
Thermal
Thermal conductivity	0.5W/m·Ksourcehot disk (ISO 22007-2), temperature not stated	0.21W/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical
Thermal expansion	20µm/m·Ksourceflow direction (MD), mean 50-150 °C	51µm/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical
100 mm part over a 50 °C swing	100µm growth2.55x less	255µm growth
Specific heat	839J/kg·KsourceASTM E1269, temperature not stated	1,300J/kg·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed)
Heats up and cools (diffusivity)	0.37mm²/s2.91x faster	0.127mm²/s
Thermal shock resistance	not sourced	not sourced
Glass transition	not sourced	77.4°Csourcetypical
Max service temperature	288°CsourceHDT 1.8 MPa (ISO 75)	76.2°CsourceHDT 0.455 MPa (printed specimens)
Values for	Sumitomo Chemical SUMIKASUPER LCP E6006L (30% glass fibre; high strength, low shrinkage); SUMIKASUPER LCP Technical Note, Version 04 / Nov. 2023, typical values.	Ultimaker PETG, 3D-printed specimens, XY (flat); Ultimaker S5 Pro, engineering intent profile, 0.15 mm layer height, AA 0.4 print core, 100% infill, Cura 4.9, printed one-at-a-time, conditioned >=24 h at room temperature. TDS v1.00, April 29, 2022.

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.

Plastic PETG is 3D printed: its properties depend on build direction and print settings; these are typical values.

Questions

Is Plastic LCP GF30 stronger than Plastic PETG?

Plastic LCP GF30 is stronger: its tensile strength is 115 MPa against yield strength 46.2 MPa for Plastic PETG (2.49x).

Which is lighter, Plastic LCP GF30 or Plastic PETG?

Plastic PETG is lighter: 1,270 kg/m³ against 1,610 kg/m³ for Plastic LCP GF30.

Which is stiffer, Plastic LCP GF30 or Plastic PETG?

Plastic LCP GF30 is stiffer: Young's modulus 11.5 GPa against 1.94 GPa for Plastic PETG, so the same part in Plastic LCP GF30 deflects less under the same load.

Which is lighter for the same job, Plastic LCP GF30 or Plastic PETG?

For the same stiffness or strength: Plastic LCP 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 LCP GF30	Plastic PETG
Stiff rod or tie (tension)	lighter	4.68x heavier
Stiff beam (bending)	lighter	1.92x heavier
Stiff panel or plate	lighter	43% heavier
Strong rod or tie	lighter	1.96x heavier
Strong beam	lighter	45% heavier
Strong panel or plate	lighter	24% 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 conducts heat better, Plastic LCP GF30 or Plastic PETG?

Plastic LCP GF30 conducts heat better: 0.5 W/m·K against 0.21 W/m·K for Plastic PETG.

Which expands less with temperature?

Plastic LCP GF30 expands less: 20 µm/m·K against 51 µm/m·K for Plastic PETG.

Among 72 materials

Stiffness against density

Strength against density