Comparison
PHB Rigid Grade E vs PETG
A side-by-side comparison of Poly(3-hydroxybutyrate), Rigid Grade E and Polyethylene Terephthalate Glycol.
Physical
Density
1.23 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.5 %
0.13 %
Transparency
Opaque to translucent
Transparent
Shrinkage
3.0 - 5.0 %
0.2 – 0.5 %
Mechanical
Young's Modulus
3.7 GPa
2.1 GPa
Tensile Strength
60 MPa
50 MPa
Elongation at Break
1.5 %
120 %
Impact Strength (Izod)
0.1 J/cm
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
5-10 °C
80 °C
Melting Point
170-175 °C
—
Continuous Service Temperature
55 °C
65 °C
Heat Deflection Temperature
50 °C
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
3.2
3.3
Volume Resistivity
10¹² Ω·cm
10¹⁴ Ω·cm
Dielectric Strength
20 kV/mm
—
Chemical resistance
Acids
Good resistance
Good
Bases
Good resistance
Fair
Solvents
Resistant to aliphatic hydrocarbons, but attacked by chlorinated and aromatic hydrocarbons
—
UV Resistance
Moderate
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Biodegradable (compost)
Recyclable
Recycling Code
7 (Other)
1
Carbon Footprint
Low
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %