PHB vs. PPE

Both PHB and PPE are thermoplastics. There are 15 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is PHB and the bottom bar is PPE.

Polyhydroxybutyrate (PHB)Polyphenylene Ether (PPE)

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		1.3
Elastic (Young's, Tensile) Modulus, GPa		2.3

Elongation at Break, %		7.5
Elongation at Break, %		30

Flexural Strength, MPa		20
Flexural Strength, MPa		75

Tensile Strength: Ultimate (UTS), MPa		30
Tensile Strength: Ultimate (UTS), MPa		55

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi), °C		60
Heat Deflection Temperature At 1.82 MPa (264 psi), °C		120

Maximum Temperature: Mechanical, °C		120
Maximum Temperature: Mechanical, °C		90

Melting Onset (Solidus), °C		180
Melting Onset (Solidus), °C		260

Vicat Softening Temperature, °C		58
Vicat Softening Temperature, °C		140

Electrical Properties

Electrical Resistivity Order of Magnitude, 10^x Ω-m		14
Electrical Resistivity Order of Magnitude, 10^x Ω-m		13

Otherwise Unclassified Properties

Density, g/cm³		1.3
Density, g/cm³		1.1

Water Absorption After 24 Hours, %		0.75
Water Absorption After 24 Hours, %		0.23

Common Calculations

Stiffness to Weight: Axial, points		0.58
Stiffness to Weight: Axial, points		1.2

Stiffness to Weight: Bending, points		29
Stiffness to Weight: Bending, points		42

Strength to Weight: Axial, points		6.7
Strength to Weight: Axial, points		14

Strength to Weight: Bending, points		17
Strength to Weight: Bending, points		30