Comparison
Rigid Unsaturated Polyester vs PETG
A side-by-side comparison of Unsaturated Polyester Resin and Polyethylene Terephthalate Glycol.
Physical
Density
1.10-1.30 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.2-0.8 %
0.13 %
Transparency
Clear to Opaque
Transparent
Shrinkage
4-8 %
0.2 – 0.5 %
Mechanical
Young's Modulus
2.0-3.5 GPa
2.1 GPa
Tensile Strength
40-70 MPa
50 MPa
Elongation at Break
1-3 %
120 %
Impact Strength (Izod)
8-20 J/m
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
50-100 °C
80 °C
Melting Point
N/A
—
Continuous Service Temperature
60-120 °C
65 °C
Heat Deflection Temperature
50-90 °C
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
4.0-5.5
3.3
Volume Resistivity
10^12-10^14 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Moderate resistance
Good
Bases
Poor resistance
Fair
Solvents
Resistant to hydrocarbons and esters
—
UV Resistance
Poor without additives
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Difficult
Recyclable
Recycling Code
N/A
1
Carbon Footprint
Moderate
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %