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 %