Comparison

PEI Standard vs PETG

A side-by-side comparison of Polyetherimide Standard and Polyethylene Terephthalate Glycol.

Property

PEI Standard

PETG

Physical

Density

1.27-1.29 g/cm³

1.27 g/cm³

Water Absorption (24h)

0.2-0.4 %

0.13 %

Transparency

Amber (transparent)

Transparent

Shrinkage

0.5-0.7 %

0.2 – 0.5 %

Mechanical

Young's Modulus

3.0-3.5 GPa

2.1 GPa

Tensile Strength

70-90 MPa

50 MPa

Elongation at Break

30-60 %

120 %

Impact Strength (Izod)

10-15 kJ/m

100 J/m

Flexural Strength

—

70 MPa

Thermal

Glass Transition Temperature

210-217 °C

80 °C

Melting Point

N/A (amorphous)

—

Continuous Service Temperature

160-170 °C

65 °C

Heat Deflection Temperature

190-205 °C (1.8 MPa)

70 °C

CTE

—

68 × 10⁻⁶ /K

Electrical

Dielectric Constant

3.1-3.8

3.3

Volume Resistivity

10^14-10^16 Ohm-cm

10¹⁴ Ω·cm

Dielectric Strength

15-20 kV/mm

—

Chemical resistance

Acids

Good

Bases

Fair

Solvents

Good (alcohols, oils, weak acids)

—

UV Resistance

Good

Fair

Alcohols

—

Good

Oils

—

Good

Sustainability

Recyclability

Recyclable (difficult)

Recyclable

Recycling Code

7 (Other)

Carbon Footprint

High

~2.7 kg CO₂e / kg

Bio-based Content

—

0 %