Comparison
Durable Tough Cast Polyurethane vs PETG
A side-by-side comparison of Cast Polyurethane (PU) elastomer and Polyethylene Terephthalate Glycol.
Physical
Density
1.15 - 1.25 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.5 - 1.5 %
0.13 %
Transparency
Opaque to Translucent
Transparent
Shrinkage
0.5 - 1.0 %
0.2 – 0.5 %
Mechanical
Young's Modulus
0.01 - 0.2 GPa
2.1 GPa
Tensile Strength
30 - 80 MPa
50 MPa
Elongation at Break
300 - 700 %
120 %
Impact Strength (Izod)
Very High
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
-10 to 10 °C
80 °C
Melting Point
N/A
—
Continuous Service Temperature
-30 to 80 °C
65 °C
Heat Deflection Temperature
60 - 100 °C
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
5.0 - 7.0
3.3
Volume Resistivity
10^10 - 10^12 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
10 - 20 kV/mm
—
Chemical resistance
Acids
Good
Good
Bases
Good
Fair
Solvents
Good resistance to oils, greases, aliphatic hydrocarbons; swells in strong polar solvents, ketones, and aromatic hydrocarbons
—
UV Resistance
Fair (can yellow)
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Difficult (thermoset-like behavior)
Recyclable
Recycling Code
N/A
1
Carbon Footprint
Moderate to High
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %