Comparison
HDPE vs PETG
A side-by-side comparison of High-Density Polyethylene and Polyethylene Terephthalate Glycol.
Physical
Density
0.95 g/cm³
1.27 g/cm³
Water Absorption (24h)
< 0.01 %
0.13 %
Transparency
Translucent to opaque
Transparent
Shrinkage
1.5 – 3.0 %
0.2 – 0.5 %
Mechanical
Young's Modulus
1.1 GPa
2.1 GPa
Tensile Strength
25 – 35 MPa
50 MPa
Impact Strength
No break
—
Elongation at Break
500 – 1000 %
120 %
Flexural Strength
—
70 MPa
Impact Strength (Izod)
—
100 J/m
Thermal
Melting Point
130 °C
—
Continuous Service Temperature
80 °C
65 °C
Heat Deflection Temperature
75 °C
70 °C
Glass Transition Temperature
—
80 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
2.3
3.3
Volume Resistivity
10¹⁶ Ω·cm
10¹⁴ Ω·cm
Chemical resistance
Acids
Excellent
Good
Bases
Excellent
Fair
Alcohols
Excellent
Good
Oils
Good
Good
UV Resistance
Poor unless stabilized
Fair
Sustainability
Recyclability
Widely recycled
Recyclable
Recycling Code
2
1
Bio-based Content
0 – 100 %
0 %
Carbon Footprint
~1.9 kg CO₂e / kg
~2.7 kg CO₂e / kg