Comparison
PP Random Copolymer Injection vs PLA
A side-by-side comparison of Polypropylene Random Copolymer for Injection Molding and Polylactic Acid.
Physical
Density
0.900-0.908 g/cm³
1.24 g/cm³
Water Absorption (24h)
<0.05 %
0.5 %
Transparency
Good to Excellent
Semi-transparent
Shrinkage
1-2.5 %
0.3 – 0.5 %
Mechanical
Young's Modulus
0.8-1.2 GPa
3.5 GPa
Tensile Strength
25-35 MPa
50 – 65 MPa
Elongation at Break
20-50 %
6 %
Impact Strength (Izod)
80-150 J/m
16 J/m
Flexural Strength
—
80 MPa
Thermal
Glass Transition Temperature
-10 °C
60 °C
Melting Point
120-140 °C
150 – 160 °C
Continuous Service Temperature
60-80 °C
45 °C
Heat Deflection Temperature
40-55 °C
55 °C
Electrical
Dielectric Constant
2.2-2.3
3.0
Volume Resistivity
>10¹⁶ Ω⋅cm
10¹⁴ Ω·cm
Dielectric Strength
20-30 kV/mm
—
Chemical resistance
Acids
Excellent resistance
Fair
Bases
Excellent resistance
Poor
Solvents
Good resistance at room temperature, swells in hot aromatic and chlorinated hydrocarbons
—
UV Resistance
Poor (requires stabilization)
Poor
Alcohols
—
Fair
Hydrolysis
—
Poor
Sustainability
Recyclability
Recyclable
Industrially compostable
Recycling Code
5 (PP)
7
Carbon Footprint
Moderate
~1.6 kg CO₂e / kg
Bio-based Content
—
100 %