Comparison
PET Unfilled vs PA66
A side-by-side comparison of Polyethylene Terephthalate Unfilled and Polyamide 6,6 (Nylon).
Physical
Density
1.33-1.40 g/cm³
1.14 g/cm³
Water Absorption (24h)
0.1-0.3 %
1.2 %
Transparency
Transparent to Opaque (depending on grade)
Opaque
Shrinkage
1.0-2.0 %
1.5 – 2.0 %
Mechanical
Young's Modulus
3.0-4.0 GPa
3.0 GPa (dry)
Tensile Strength
50-70 MPa
80 MPa
Elongation at Break
5-50 %
60 %
Impact Strength (Izod)
3-7 kJ/m
50 J/m
Flexural Strength
—
110 MPa
Thermal
Glass Transition Temperature
65-80 °C
70 °C
Melting Point
250-265 °C
255 – 265 °C
Continuous Service Temperature
80-100 °C
100 – 120 °C
Heat Deflection Temperature
50-70 °C (1.8 MPa)
75 °C (unfilled)
Electrical
Dielectric Constant
3.0-3.5
4.0
Volume Resistivity
10^14-10^16 Ohm-cm
10¹² Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Good
Poor
Bases
Poor
Good
Solvents
Good (alcohols, oils)
—
UV Resistance
Fair
Fair
Alcohols
—
Good
Oils & Fuels
—
Excellent
Sustainability
Recyclability
Highly Recyclable
Recyclable
Recycling Code
1 (PET)
7
Carbon Footprint
Moderate
~7.4 kg CO₂e / kg
Bio-based Content
—
0 – 100 % (bio grades)