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