Comparison
PET Bottle Grade vs PETG
A side-by-side comparison of Polyethylene Terephthalate for Bottle Applications and Polyethylene Terephthalate Glycol.
Physical
Density
1.30-1.39 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.1-0.5 %
0.13 %
Transparency
Excellent
Transparent
Shrinkage
0.5-1.5 %
0.2 – 0.5 %
Mechanical
Young's Modulus
2.5-4.0 GPa
2.1 GPa
Tensile Strength
50-70 MPa
50 MPa
Elongation at Break
10-50 %
120 %
Impact Strength (Izod)
30-60 J/m
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
65-85 °C
80 °C
Melting Point
250-260 °C
—
Continuous Service Temperature
70-80 °C
65 °C
Heat Deflection Temperature
60-70 °C
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
3.0-3.2
3.3
Volume Resistivity
10¹²-10¹⁴ Ω⋅cm
10¹⁴ Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Good resistance to dilute acids
Good
Bases
Poor resistance to strong bases
Fair
Solvents
Insoluble in most solvents, but can be attacked by strong acids, bases, and chlorinated hydrocarbons
—
UV Resistance
Fair (requires stabilization)
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 %