Comparison
PA66 vs HDPE
A side-by-side comparison of Polyamide 6,6 (Nylon) and High-Density Polyethylene.
Physical
Density
1.14 g/cm³
0.95 g/cm³
Water Absorption (24h)
1.2 %
< 0.01 %
Transparency
Opaque
Translucent to opaque
Shrinkage
1.5 – 2.0 %
1.5 – 3.0 %
Mechanical
Young's Modulus
3.0 GPa (dry)
1.1 GPa
Tensile Strength
80 MPa
25 – 35 MPa
Flexural Strength
110 MPa
—
Impact Strength (Izod)
50 J/m
—
Elongation at Break
60 %
500 – 1000 %
Impact Strength
—
No break
Thermal
Melting Point
255 – 265 °C
130 °C
Glass Transition Temperature
70 °C
—
Continuous Service Temperature
100 – 120 °C
80 °C
Heat Deflection Temperature
75 °C (unfilled)
75 °C
Electrical
Dielectric Constant
4.0
2.3
Volume Resistivity
10¹² Ω·cm
10¹⁶ Ω·cm
Chemical resistance
Acids
Poor
Excellent
Bases
Good
Excellent
Alcohols
Good
Excellent
Oils & Fuels
Excellent
—
UV Resistance
Fair
Poor unless stabilized
Oils
—
Good
Sustainability
Recyclability
Recyclable
Widely recycled
Recycling Code
7
2
Bio-based Content
0 – 100 % (bio grades)
0 – 100 %
Carbon Footprint
~7.4 kg CO₂e / kg
~1.9 kg CO₂e / kg