Comparison

Glass-Filled PBT vs PETG

A side-by-side comparison of Polybutylene Terephthalate, Glass Fiber Reinforced and Polyethylene Terephthalate Glycol.

Property

Glass-Filled PBT

PETG

Physical

Density

1.45-1.60 g/cm³

1.27 g/cm³

Water Absorption (24h)

0.1-0.2 %

0.13 %

Transparency

Opaque

Transparent

Shrinkage

0.3-0.6 %

0.2 – 0.5 %

Mechanical

Young's Modulus

8-12 GPa

2.1 GPa

Tensile Strength

70-100 MPa

50 MPa

Elongation at Break

4-10 %

120 %

Impact Strength (Izod)

6-12 kJ/m

100 J/m

Flexural Strength

—

70 MPa

Thermal

Glass Transition Temperature

20-50 °C

80 °C

Melting Point

220-230 °C

—

Continuous Service Temperature

100-130 °C

65 °C

Heat Deflection Temperature

150-200 °C (1.8 MPa)

70 °C

CTE

—

68 × 10⁻⁶ /K

Electrical

Dielectric Constant

3.0-3.5

3.3

Volume Resistivity

10^12-10^14 Ohm-cm

10¹⁴ Ω·cm

Dielectric Strength

20-28 kV/mm

—

Chemical resistance

Acids

Good

Bases

Fair

Solvents

Excellent

—

UV Resistance

Fair

Alcohols

—

Good

Oils

—

Good

Sustainability

Recyclability

Recyclable

Recycling Code

7 (Other)

Carbon Footprint

Moderate

~2.7 kg CO₂e / kg

Bio-based Content

—

0 %