Comparison
PET Unfilled vs PETG
A side-by-side comparison of Polyethylene Terephthalate Unfilled and Polyethylene Terephthalate Glycol.
Physical
Density
1.33-1.40 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.1-0.3 %
0.13 %
Transparency
Transparent to Opaque (depending on grade)
Transparent
Shrinkage
1.0-2.0 %
0.2 – 0.5 %
Mechanical
Young's Modulus
3.0-4.0 GPa
2.1 GPa
Tensile Strength
50-70 MPa
50 MPa
Elongation at Break
5-50 %
120 %
Impact Strength (Izod)
3-7 kJ/m
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
65-80 °C
80 °C
Melting Point
250-265 °C
—
Continuous Service Temperature
80-100 °C
65 °C
Heat Deflection Temperature
50-70 °C (1.8 MPa)
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
3.0-3.5
3.3
Volume Resistivity
10^14-10^16 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Good
Good
Bases
Poor
Fair
Solvents
Good (alcohols, oils)
—
UV Resistance
Fair
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Highly Recyclable
Recyclable
Recycling Code
1 (PET)
1
Carbon Footprint
Moderate
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %