Comparison

PETG vs PA66

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

Property

PETG

PA66

Physical

Density

1.27 g/cm³

1.14 g/cm³

Water Absorption (24h)

0.13 %

1.2 %

Transparency

Transparent

Opaque

Shrinkage

0.2 – 0.5 %

1.5 – 2.0 %

Mechanical

Young's Modulus

2.1 GPa

3.0 GPa (dry)

Tensile Strength

50 MPa

80 MPa

Flexural Strength

70 MPa

110 MPa

Impact Strength (Izod)

100 J/m

50 J/m

Elongation at Break

120 %

60 %

Thermal

Glass Transition Temperature

80 °C

70 °C

Heat Deflection Temperature

70 °C

75 °C (unfilled)

Continuous Service Temperature

65 °C

100 – 120 °C

CTE

68 × 10⁻⁶ /K

—

Melting Point

—

255 – 265 °C

Electrical

Dielectric Constant

3.3

4.0

Volume Resistivity

10¹⁴ Ω·cm

10¹² Ω·cm

Chemical resistance

Acids

Good

Poor

Bases

Fair

Good

Alcohols

Good

Oils

Good

—

UV Resistance

Fair

Oils & Fuels

—

Excellent

Sustainability

Recyclability

Recyclable

Recycling Code

Bio-based Content

0 %

0 – 100 % (bio grades)

Carbon Footprint

~2.7 kg CO₂e / kg

~7.4 kg CO₂e / kg