Comparison
SMC/BMC for Automotive vs PEEK
A side-by-side comparison of Sheet Molding Compound / Bulk Molding Compound and Polyether Ether Ketone.
Physical
Density
1.60-1.90 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.1-0.5 %
0.15 %
Transparency
Opaque
Opaque (amber)
Shrinkage
0.5-1.5 %
1.1 – 1.4 %
Mechanical
Young's Modulus
10-20 GPa
3.6 GPa
Tensile Strength
80-150 MPa
100 MPa
Elongation at Break
1-3 %
50 %
Impact Strength (Izod)
20-50 J/m
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
80-120 °C
143 °C
Melting Point
N/A
343 °C
Continuous Service Temperature
100-150 °C
260 °C
Heat Deflection Temperature
80-120 °C
160 °C
Electrical
Dielectric Constant
4.5-6.0
3.2
Volume Resistivity
10^12-10^14 Ohm-cm
10¹⁶ Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Good resistance
Excellent
Bases
Moderate resistance
Excellent
Solvents
Good resistance to hydrocarbons
Excellent
UV Resistance
Moderate without additives
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Difficult
Recyclable (specialty)
Recycling Code
N/A
7
Carbon Footprint
Moderate
~30 kg CO₂e / kg