Comparison
Ionomer Surlyn Packaging vs PEEK
A side-by-side comparison of Ionomer (Surlyn) for High-Performance Packaging and Polyether Ether Ketone.
Physical
Density
0.935-0.950 g/cm³
1.32 g/cm³
Water Absorption (24h)
<0.5 %
0.15 %
Transparency
Good to Excellent
Opaque (amber)
Shrinkage
2-4 %
1.1 – 1.4 %
Mechanical
Young's Modulus
0.2-0.5 GPa
3.6 GPa
Tensile Strength
20-35 MPa
100 MPa
Elongation at Break
300-600 %
50 %
Impact Strength (Izod)
Excellent
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
-80 to -60 °C
143 °C
Melting Point
90-105 °C
343 °C
Continuous Service Temperature
50-60 °C
260 °C
Heat Deflection Temperature
30-40 °C
160 °C
Electrical
Dielectric Constant
2.3-2.5
3.2
Volume Resistivity
>10¹⁴ Ω⋅cm
10¹⁶ Ω·cm
Dielectric Strength
20-30 kV/mm
—
Chemical resistance
Acids
Good resistance
Excellent
Bases
Good resistance
Excellent
Solvents
Good resistance at room temp, swells in hot aromatic and chlorinated hydrocarbons
Excellent
UV Resistance
Poor (requires stabilization)
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Recyclable (often as part of multilayer)
Recyclable (specialty)
Recycling Code
4 (PE-LD or PE-LLD)
7
Carbon Footprint
Moderate
~30 kg CO₂e / kg