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 %