Comparison

Polypropylene vs PETG

A side-by-side comparison of Polypropylene and Polyethylene Terephthalate Glycol.

Property

Polypropylene

PETG

Physical

Density

0.90 g/cm³

1.27 g/cm³

Water Absorption (24h)

0.01 %

0.13 %

Transparency

Translucent

Transparent

Shrinkage

1.0 – 2.5 %

0.2 – 0.5 %

Mechanical

Young's Modulus

1.5 GPa

2.1 GPa

Tensile Strength

30 – 40 MPa

50 MPa

Impact Strength (Izod)

40 J/m

100 J/m

Elongation at Break

100 – 600 %

120 %

Flexural Strength

—

70 MPa

Thermal

Melting Point

160 °C

—

Continuous Service Temperature

100 °C

65 °C

Heat Deflection Temperature

100 °C

70 °C

Glass Transition Temperature

—

80 °C

CTE

—

68 × 10⁻⁶ /K

Electrical

Dielectric Constant

2.2

3.3

Volume Resistivity

10¹⁷ Ω·cm

10¹⁴ Ω·cm

Chemical resistance

Acids

Excellent

Good

Bases

Excellent

Fair

Solvents

Good

—

UV Resistance

Poor unless stabilized

Fair

Alcohols

—

Good

Oils

—

Good

Sustainability

Recyclability

Recyclable

Recycling Code

Carbon Footprint

~1.6 kg CO₂e / kg

~2.7 kg CO₂e / kg

Bio-based Content

—

0 %