Comparison

Glass-Filled PBT vs PA66

A side-by-side comparison of Polybutylene Terephthalate, Glass Fiber Reinforced and Polyamide 6,6 (Nylon).

Property

Glass-Filled PBT

PA66

Physical

Density

1.45-1.60 g/cm³

1.14 g/cm³

Water Absorption (24h)

0.1-0.2 %

1.2 %

Transparency

Opaque

Shrinkage

0.3-0.6 %

1.5 – 2.0 %

Mechanical

Young's Modulus

8-12 GPa

3.0 GPa (dry)

Tensile Strength

70-100 MPa

80 MPa

Elongation at Break

4-10 %

60 %

Impact Strength (Izod)

6-12 kJ/m

50 J/m

Flexural Strength

—

110 MPa

Thermal

Glass Transition Temperature

20-50 °C

70 °C

Melting Point

220-230 °C

255 – 265 °C

Continuous Service Temperature

100-130 °C

100 – 120 °C

Heat Deflection Temperature

150-200 °C (1.8 MPa)

75 °C (unfilled)

Electrical

Dielectric Constant

3.0-3.5

4.0

Volume Resistivity

10^12-10^14 Ohm-cm

10¹² Ω·cm

Dielectric Strength

20-28 kV/mm

—

Chemical resistance

Acids

Good

Poor

Bases

Fair

Good

Solvents

Excellent

—

UV Resistance

Fair

Alcohols

—

Good

Oils & Fuels

—

Excellent

Sustainability

Recyclability

Recyclable

Recycling Code

7 (Other)

Carbon Footprint

Moderate

~7.4 kg CO₂e / kg

Bio-based Content

—

0 – 100 % (bio grades)