Comparison
PHB Rigid Grade E vs PEEK
A side-by-side comparison of Poly(3-hydroxybutyrate), Rigid Grade E and Polyether Ether Ketone.
Physical
Density
1.23 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.5 %
0.15 %
Transparency
Opaque to translucent
Opaque (amber)
Shrinkage
3.0 - 5.0 %
1.1 – 1.4 %
Mechanical
Young's Modulus
3.7 GPa
3.6 GPa
Tensile Strength
60 MPa
100 MPa
Elongation at Break
1.5 %
50 %
Impact Strength (Izod)
0.1 J/cm
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
5-10 °C
143 °C
Melting Point
170-175 °C
343 °C
Continuous Service Temperature
55 °C
260 °C
Heat Deflection Temperature
50 °C
160 °C
Electrical
Dielectric Constant
3.2
3.2
Volume Resistivity
10¹² Ω·cm
10¹⁶ Ω·cm
Dielectric Strength
20 kV/mm
—
Chemical resistance
Acids
Good resistance
Excellent
Bases
Good resistance
Excellent
Solvents
Resistant to aliphatic hydrocarbons, but attacked by chlorinated and aromatic hydrocarbons
Excellent
UV Resistance
Moderate
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Biodegradable (compost)
Recyclable (specialty)
Recycling Code
7 (Other)
7
Carbon Footprint
Low
~30 kg CO₂e / kg