Comparison
Durable Tough Cast Polyurethane vs PA66
A side-by-side comparison of Cast Polyurethane (PU) elastomer and Polyamide 6,6 (Nylon).
Physical
Density
1.15 - 1.25 g/cm³
1.14 g/cm³
Water Absorption (24h)
0.5 - 1.5 %
1.2 %
Transparency
Opaque to Translucent
Opaque
Shrinkage
0.5 - 1.0 %
1.5 – 2.0 %
Mechanical
Young's Modulus
0.01 - 0.2 GPa
3.0 GPa (dry)
Tensile Strength
30 - 80 MPa
80 MPa
Elongation at Break
300 - 700 %
60 %
Impact Strength (Izod)
Very High
50 J/m
Flexural Strength
—
110 MPa
Thermal
Glass Transition Temperature
-10 to 10 °C
70 °C
Melting Point
N/A
255 – 265 °C
Continuous Service Temperature
-30 to 80 °C
100 – 120 °C
Heat Deflection Temperature
60 - 100 °C
75 °C (unfilled)
Electrical
Dielectric Constant
5.0 - 7.0
4.0
Volume Resistivity
10^10 - 10^12 Ohm-cm
10¹² Ω·cm
Dielectric Strength
10 - 20 kV/mm
—
Chemical resistance
Acids
Good
Poor
Bases
Good
Good
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 & Fuels
—
Excellent
Sustainability
Recyclability
Difficult (thermoset-like behavior)
Recyclable
Recycling Code
N/A
7
Carbon Footprint
Moderate to High
~7.4 kg CO₂e / kg
Bio-based Content
—
0 – 100 % (bio grades)