Comparison
PP Random Copolymer Injection vs PETG
A side-by-side comparison of Polypropylene Random Copolymer for Injection Molding and Polyethylene Terephthalate Glycol.
Physical
Density
0.900-0.908 g/cm³
1.27 g/cm³
Water Absorption (24h)
<0.05 %
0.13 %
Transparency
Good to Excellent
Transparent
Shrinkage
1-2.5 %
0.2 – 0.5 %
Mechanical
Young's Modulus
0.8-1.2 GPa
2.1 GPa
Tensile Strength
25-35 MPa
50 MPa
Elongation at Break
20-50 %
120 %
Impact Strength (Izod)
80-150 J/m
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
-10 °C
80 °C
Melting Point
120-140 °C
—
Continuous Service Temperature
60-80 °C
65 °C
Heat Deflection Temperature
40-55 °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 %