Comparison

PA66 vs PETG

A side-by-side comparison of Polyamide 6,6 (Nylon) and Polyethylene Terephthalate Glycol.

Property
PA66
PETG

Physical

Density
1.14 g/cm³
1.27 g/cm³
Water Absorption (24h)
1.2 %
0.13 %
Transparency
Opaque
Transparent
Shrinkage
1.5 – 2.0 %
0.2 – 0.5 %

Mechanical

Young's Modulus
3.0 GPa (dry)
2.1 GPa
Tensile Strength
80 MPa
50 MPa
Flexural Strength
110 MPa
70 MPa
Impact Strength (Izod)
50 J/m
100 J/m
Elongation at Break
60 %
120 %

Thermal

Melting Point
255 – 265 °C
Glass Transition Temperature
70 °C
80 °C
Continuous Service Temperature
100 – 120 °C
65 °C
Heat Deflection Temperature
75 °C (unfilled)
70 °C
CTE
68 × 10⁻⁶ /K

Electrical

Dielectric Constant
4.0
3.3
Volume Resistivity
10¹² Ω·cm
10¹⁴ Ω·cm

Chemical resistance

Acids
Poor
Good
Bases
Good
Fair
Alcohols
Good
Good
Oils & Fuels
Excellent
UV Resistance
Fair
Fair
Oils
Good

Sustainability

Recyclability
Recyclable
Recyclable
Recycling Code
7
1
Bio-based Content
0 – 100 % (bio grades)
0 %
Carbon Footprint
~7.4 kg CO₂e / kg
~2.7 kg CO₂e / kg