Comparison
Styrenic Block Copolymer Commodity vs PEEK
A side-by-side comparison of Styrenic Block Copolymers for Commodity Applications and Polyether Ether Ketone.
Physical
Density
0.90-1.00 g/cm³
1.32 g/cm³
Water Absorption (24h)
<0.1 %
0.15 %
Transparency
Translucent to opaque
Opaque (amber)
Shrinkage
1-3 %
1.1 – 1.4 %
Mechanical
Young's Modulus
0.01-0.05 GPa
3.6 GPa
Tensile Strength
5-15 MPa
100 MPa
Elongation at Break
300-800 %
50 %
Impact Strength (Izod)
No break (at room temp)
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
-60 to -40 °C
143 °C
Melting Point
N/A (softens)
343 °C
Continuous Service Temperature
50-70 °C
260 °C
Heat Deflection Temperature
N/A
160 °C
Electrical
Dielectric Constant
2.5-3.0
3.2
Volume Resistivity
10¹³-10¹⁵ Ω⋅cm
10¹⁶ Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Good resistance
Excellent
Bases
Good resistance
Excellent
Solvents
Excellent resistance to polar solvents; softened by aromatic and chlorinated hydrocarbons
Excellent
UV Resistance
Poor (requires stabilization)
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Recyclable (often compounded)
Recyclable (specialty)
Recycling Code
7 (Other) or depends on base polymer
7
Carbon Footprint
Moderate
~30 kg CO₂e / kg