Comparison
PP Homopolymer Injection vs PETG
A side-by-side comparison of Polypropylene Homopolymer for Injection Molding and Polyethylene Terephthalate Glycol.
Physical
Density
0.900-0.915 g/cm³
1.27 g/cm³
Water Absorption (24h)
<0.05 %
0.13 %
Transparency
Can be translucent to opaque
Transparent
Shrinkage
1-2.5 %
0.2 – 0.5 %
Mechanical
Young's Modulus
1.2-1.7 GPa
2.1 GPa
Tensile Strength
30-40 MPa
50 MPa
Elongation at Break
2-10 %
120 %
Impact Strength (Izod)
50-100 J/m
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
-10 °C
80 °C
Melting Point
160-170 °C
—
Continuous Service Temperature
80-100 °C
65 °C
Heat Deflection Temperature
60-80 °C
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
2.2-2.3
3.3
Volume Resistivity
>10¹⁶ Ω⋅cm
10¹⁴ Ω·cm
Dielectric Strength
20-30 kV/mm
—
Chemical resistance
Acids
Excellent resistance
Good
Bases
Excellent resistance
Fair
Solvents
Good resistance at room temperature, swells in hot aromatic and chlorinated hydrocarbons
—
UV Resistance
Poor (requires stabilization)
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Recyclable
Recyclable
Recycling Code
5 (PP)
1
Carbon Footprint
Moderate
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %