Comparison

Flexible Cast Polyurethane vs PETG

A side-by-side comparison of Cast Polyurethane and Polyethylene Terephthalate Glycol.

Physical

Density
1.10-1.25 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.5-1.5 %
0.13 %
Transparency
Opaque to Translucent
Transparent
Shrinkage
0.5-1.5 %
0.2 – 0.5 %

Mechanical

Young's Modulus
0.01-1.0 GPa (Shore A to D hardness)
2.1 GPa
Tensile Strength
20-60 MPa
50 MPa
Elongation at Break
300-800 %
120 %
Impact Strength (Izod)
30-100 J/m
100 J/m
Flexural Strength
70 MPa

Thermal

Glass Transition Temperature
-50 to 100 °C
80 °C
Melting Point
N/A
Continuous Service Temperature
70-120 °C
65 °C
Heat Deflection Temperature
20-80 °C
70 °C
CTE
68 × 10⁻⁶ /K

Electrical

Dielectric Constant
3.5-5.0
3.3
Volume Resistivity
10^10-10^13 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
10-20 kV/mm

Chemical resistance

Acids
Good resistance
Good
Bases
Good resistance
Fair
Solvents
Resistant to oils and greases, swells in polar solvents
UV Resistance
Poor without additives
Fair
Alcohols
Good
Oils
Good

Sustainability

Recyclability
Difficult
Recyclable
Recycling Code
N/A
1
Carbon Footprint
Moderate
~2.7 kg CO₂e / kg
Bio-based Content
0 %