Comparison
SMC/BMC for Automotive vs PETG
A side-by-side comparison of Sheet Molding Compound / Bulk Molding Compound and Polyethylene Terephthalate Glycol.
Physical
Density
1.60-1.90 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.1-0.5 %
0.13 %
Transparency
Opaque
Transparent
Shrinkage
0.5-1.5 %
0.2 – 0.5 %
Mechanical
Young's Modulus
10-20 GPa
2.1 GPa
Tensile Strength
80-150 MPa
50 MPa
Elongation at Break
1-3 %
120 %
Impact Strength (Izod)
20-50 J/m
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
80-120 °C
80 °C
Melting Point
N/A
—
Continuous Service Temperature
100-150 °C
65 °C
Heat Deflection Temperature
80-120 °C
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
4.5-6.0
3.3
Volume Resistivity
10^12-10^14 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Good resistance
Good
Bases
Moderate resistance
Fair
Solvents
Good resistance to hydrocarbons
—
UV Resistance
Moderate without additives
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Difficult
Recyclable
Recycling Code
N/A
1
Carbon Footprint
Moderate
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %