Plastic LCP GF30 vs. Plastic PETG

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

Plastic LCP GF30Bulk polymer (molded or machined)

Mechanical	Plastic LCP GF30	Plastic PETG
Yield strength	not given (tensile used)	46.2MPa1
Ultimate tensile strength	tensile strength115MPa22.49x stronger	46.2MPa1
Flexural strength	184MPa22.33x stronger in bending	78.9MPa1
Elongation at break	tensile elongation1.5%2	7.6%15.07x more ductile
Young's modulus (stiffness)	tensile modulus11.5GPa25.93x stiffer	1.94GPa1
Density	1,610kg/m³2	1,270kg/m³127% 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/s2.16x faster	1,236m/s

Stiffness against densityHigher and further left: stiffer for its weight

Strength against densityHigher and further left: stronger for its weight

Thermal	Plastic LCP GF30	Plastic PETG
Thermal conductivity	hot disk0.5W/m·K22.38x more heat through a fin	base material0.21W/m·K3
Thermal expansion	flow direction20µm/m·K22.55x less	base material51µm/m·K3
100 mm part over a 50 °C swing	100µm growth2.55x less	255µm growth
Specific heat	ASTM E1269839J/kg·K2	base material1,300J/kg·K31.55x higher
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°C1
Max service temperature	HDT 1.8 MPa288°C2	HDT 0.455 MPa76.2°C1

Thermal conductivity against densityHigher and further left: spreads more heat for its weight

Thermal expansion against thermal conductivityLower and further right: warps less when heated

Try it on a partA bracket to run stress or thermal on, free in your browser	Open in LessCAD	Open in LessCAD

Sources3 documents: UltiMaker, Sumitomo Chemical, Eastman

Plastic LCP GF30: Sumitomo Chemical SUMIKASUPER LCP E6006L (30% glass fibre; high strength, low shrinkage); SUMIKASUPER LCP Technical Note, Version 04 / Nov. 2023, typical values.
Plastic PETG: 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.

1
Ultimaker PETG Technical Data Sheet, v1.00UltiMakerarchived copyPlastic PETG · Yield strength: typicalPlastic PETG · Ultimate tensile strength: typical, peak stress (= stress at yield)Plastic PETG · Flexural strength: typicalPlastic PETG · Elongation at break: typicalPlastic PETG · Young's modulus (stiffness): typicalPlastic PETG · Density: typicalPlastic PETG · Glass transition: typicalPlastic PETG · Max service temperature: HDT 0.455 MPa (printed specimens)
2
SUMIKASUPER LCP Technical Note, Version 04 (2023)Sumitomo Chemicalarchived copyPlastic LCP GF30 · Ultimate tensile strength: tensile strength (ISO 527)Plastic LCP GF30 · Flexural strength: typical (ISO 178)Plastic LCP GF30 · Elongation at break: tensile elongation (ISO 527)Plastic LCP GF30 · Young's modulus (stiffness): tensile modulus (ISO 527)Plastic LCP GF30 · Density: typicalPlastic LCP GF30 · Thermal conductivity: hot disk (ISO 22007-2), temperature not statedPlastic LCP GF30 · Thermal expansion: flow direction (MD), mean 50-150 °CPlastic LCP GF30 · Specific heat: ASTM E1269, temperature not statedPlastic LCP GF30 · Max service temperature: HDT 1.8 MPa (ISO 75)
3
Eastar Copolyester 6763 Product Data SheetEastmanPlastic PETG · Thermal conductivity: base material: Eastman Eastar Copolyester 6763 (PETG), typicalPlastic PETG · Thermal expansion: base material: Eastman Eastar Copolyester 6763 (PETG), typicalPlastic PETG · Specific heat: base material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed)

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.

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

Questions

Mechanical

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 is more ductile, Plastic LCP GF30 or Plastic PETG?

Plastic PETG stretches further before it breaks: 7.6% elongation at break against 1.5% for Plastic LCP GF30.

Thermal

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.