Comparison
PEEK vs PLA
A side-by-side comparison of Polyether Ether Ketone and Polylactic Acid.
Physical
Density
1.32 g/cm³
1.24 g/cm³
Water Absorption (24h)
0.15 %
0.5 %
Transparency
Opaque (amber)
Semi-transparent
Shrinkage
1.1 – 1.4 %
0.3 – 0.5 %
Mechanical
Young's Modulus
3.6 GPa
3.5 GPa
Tensile Strength
100 MPa
50 – 65 MPa
Flexural Strength
170 MPa
80 MPa
Impact Strength (Izod)
55 J/m
16 J/m
Elongation at Break
50 %
6 %
Thermal
Melting Point
343 °C
150 – 160 °C
Glass Transition Temperature
143 °C
60 °C
Continuous Service Temperature
260 °C
45 °C
Heat Deflection Temperature
160 °C
55 °C
Electrical
Dielectric Constant
3.2
3.0
Volume Resistivity
10¹⁶ Ω·cm
10¹⁴ Ω·cm
Chemical resistance
Acids
Excellent
Fair
Bases
Excellent
Poor
Solvents
Excellent
—
Hydrolysis (steam)
Excellent
—
UV Resistance
Fair
Poor
Alcohols
—
Fair
Hydrolysis
—
Poor
Sustainability
Recyclability
Recyclable (specialty)
Industrially compostable
Recycling Code
7
7
Carbon Footprint
~30 kg CO₂e / kg
~1.6 kg CO₂e / kg
Bio-based Content
—
100 %