Comparison
PDLA Stereocomplex Grade C vs PETG
A side-by-side comparison of Poly(D-lactic acid), Stereocomplex Grade C and Polyethylene Terephthalate Glycol.
Physical
Density
1.27 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.25 %
0.13 %
Transparency
Good
Transparent
Shrinkage
1.5 - 4.0 %
0.2 – 0.5 %
Mechanical
Young's Modulus
4.0 GPa
2.1 GPa
Tensile Strength
65 MPa
50 MPa
Elongation at Break
2.0 %
120 %
Impact Strength (Izod)
0.2 J/cm
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
55-60 °C
80 °C
Melting Point
220-230 °C (stereocomplex)
—
Continuous Service Temperature
70 °C
65 °C
Heat Deflection Temperature
75 °C
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
3.5
3.3
Volume Resistivity
10¹¹ Ω·cm
10¹⁴ Ω·cm
Dielectric Strength
25 kV/mm
—
Chemical resistance
Acids
Poor resistance
Good
Bases
Poor resistance
Fair
Solvents
Resistant to oils and greases, but swells in chlorinated hydrocarbons
—
UV Resistance
Poor
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Compostable (industrial)
Recyclable
Recycling Code
7 (Other)
1
Carbon Footprint
Lower than fossil-based plastics
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %