Plastic PETG

Plastic PETG strength, stiffness, density and thermal properties, with their source.

A bracket in Plastic PETG, 3D-printed (layer lines) finish.

Mechanical
Yield strength	46.2MPa1
Ultimate tensile strength	46.2MPa1
Flexural strength	78.9MPa1
Elongation at break	7.6%1
Young's modulus (stiffness)	1.94GPa1
Density	1,270kg/m³1
Strength to weight	36.4kN·m/kg
Stiffness to weight	1.53MN·m/kg
Poisson's ratio	not sourced
Shear modulus	not sourced
Bulk modulus	not sourced
Speed of sound	1,236m/s

Stiffness against densityHigher and further left: stiffer for its weight

Strength against densityHigher and further left: stronger for its weight

Thermal
Thermal conductivity	base material0.21W/m·K2
Thermal expansion	base material51µm/m·K2
100 mm part over a 50 °C swing	255µm growth
Specific heat	base material1,300J/kg·K2
Heats up and cools (diffusivity)	0.127mm²/s
Thermal shock resistance	not sourced
Glass transition	77.4°C1
Max service temperature	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

Sources2 documents: UltiMaker, Eastman

Values for: 3D printed (FDM). 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 copyYield strength: typicalUltimate tensile strength: typical, peak stress (= stress at yield)Flexural strength: typicalElongation at break: typicalYoung's modulus (stiffness): typicalDensity: typicalGlass transition: typicalMax service temperature: HDT 0.455 MPa (printed specimens)
2
Eastar Copolyester 6763 Product Data SheetEastmanThermal conductivity: base material: Eastman Eastar Copolyester 6763 (PETG), typicalThermal expansion: base material: Eastman Eastar Copolyester 6763 (PETG), typicalSpecific heat: base material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed)

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

Open in LessCAD

Thermal properties of Plastic PETG

Thermal conductivity of Plastic PETG

Plastic PETG has a thermal conductivity of 0.21 W/m·K (0.121 BTU/hr·ft·°F). Basis: base material: Eastman Eastar Copolyester 6763 (PETG), typical. Source: Eastman, Eastar Copolyester 6763 Product Data Sheet.

Specific heat of Plastic PETG

The specific heat capacity of Plastic PETG is 1,300 J/kg·K (0.31 BTU/lb·°F). Basis: base material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed). Source: Eastman, Eastar Copolyester 6763 Product Data Sheet.

Coefficient of thermal expansion of Plastic PETG

Plastic PETG expands 51 µm/m·K (28.3 µin/in·°F): a 100 mm part grows 255 µm over a 50 °C rise. Basis: base material: Eastman Eastar Copolyester 6763 (PETG), typical. Source: Eastman, Eastar Copolyester 6763 Product Data Sheet.

Thermal diffusivity of Plastic PETG

Computed from the conductivity, density and specific heat (k / ρc): 0.127 mm²/s, how fast a temperature change spreads through it.

Glass transition temperature of Plastic PETG

Plastic PETG softens at its glass transition, 77.4 °C (171 °F). Basis: typical. Source: UltiMaker, Ultimaker PETG Technical Data Sheet, v1.00archived copy.

Maximum service temperature of Plastic PETG

The maximum service temperature of Plastic PETG is 76.2 °C (169 °F). Basis: HDT 0.455 MPa (printed specimens). Source: UltiMaker, Ultimaker PETG Technical Data Sheet, v1.00archived copy.