Comparison
PDLLA High Molecular Weight vs PETG
A side-by-side comparison of Poly(D,L-lactic acid), High Molecular Weight Grade W and Polyethylene Terephthalate Glycol.
Physical
Density
1.26 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.6 %
0.13 %
Transparency
High (amorphous)
Transparent
Shrinkage
3.5 - 6.5 %
0.2 – 0.5 %
Mechanical
Young's Modulus
2.5 GPa
2.1 GPa
Tensile Strength
50 MPa
50 MPa
Elongation at Break
4.0 %
120 %
Impact Strength (Izod)
0.2 J/cm
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
48-52 °C
80 °C
Melting Point
None (amorphous)
—
Continuous Service Temperature
0 °C
65 °C
Heat Deflection Temperature
42 °C
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
3.1
3.3
Volume Resistivity
10¹³ Ω·cm
10¹⁴ Ω·cm
Dielectric Strength
19 kV/mm
—
Chemical resistance
Acids
Poor resistance
Good
Bases
Poor resistance
Fair
Solvents
Swells in many organic solvents, particularly esters and ketones
—
UV Resistance
Poor
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Compostable (industrial), implantable (biocompatible)
Recyclable
Recycling Code
7 (Other)
1
Carbon Footprint
Lower than fossil-based plastics
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %