Comparison

PDLA Stereocomplex Grade C vs PEEK

A side-by-side comparison of Poly(D-lactic acid), Stereocomplex Grade C and Polyether Ether Ketone.

Physical

Density
1.27 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.25 %
0.15 %
Transparency
Good
Opaque (amber)
Shrinkage
1.5 - 4.0 %
1.1 – 1.4 %

Mechanical

Young's Modulus
4.0 GPa
3.6 GPa
Tensile Strength
65 MPa
100 MPa
Elongation at Break
2.0 %
50 %
Impact Strength (Izod)
0.2 J/cm
55 J/m
Flexural Strength
170 MPa

Thermal

Glass Transition Temperature
55-60 °C
143 °C
Melting Point
220-230 °C (stereocomplex)
343 °C
Continuous Service Temperature
70 °C
260 °C
Heat Deflection Temperature
75 °C
160 °C

Electrical

Dielectric Constant
3.5
3.2
Volume Resistivity
10¹¹ Ω·cm
10¹⁶ Ω·cm
Dielectric Strength
25 kV/mm

Chemical resistance

Acids
Poor resistance
Excellent
Bases
Poor resistance
Excellent
Solvents
Resistant to oils and greases, but swells in chlorinated hydrocarbons
Excellent
UV Resistance
Poor
Fair
Hydrolysis (steam)
Excellent

Sustainability

Recyclability
Compostable (industrial)
Recyclable (specialty)
Recycling Code
7 (Other)
7
Carbon Footprint
Lower than fossil-based plastics
~30 kg CO₂e / kg