Comparison
Styrenic Block Copolymer Commodity vs PETG
A side-by-side comparison of Styrenic Block Copolymers for Commodity Applications and Polyethylene Terephthalate Glycol.
Physical
Density
0.90-1.00 g/cm³
1.27 g/cm³
Water Absorption (24h)
<0.1 %
0.13 %
Transparency
Translucent to opaque
Transparent
Shrinkage
1-3 %
0.2 – 0.5 %
Mechanical
Young's Modulus
0.01-0.05 GPa
2.1 GPa
Tensile Strength
5-15 MPa
50 MPa
Elongation at Break
300-800 %
120 %
Impact Strength (Izod)
No break (at room temp)
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
-60 to -40 °C
80 °C
Melting Point
N/A (softens)
—
Continuous Service Temperature
50-70 °C
65 °C
Heat Deflection Temperature
N/A
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
2.5-3.0
3.3
Volume Resistivity
10¹³-10¹⁵ Ω⋅cm
10¹⁴ Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Good resistance
Good
Bases
Good resistance
Fair
Solvents
Excellent resistance to polar solvents; softened by aromatic and chlorinated hydrocarbons
—
UV Resistance
Poor (requires stabilization)
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Recyclable (often compounded)
Recyclable
Recycling Code
7 (Other) or depends on base polymer
1
Carbon Footprint
Moderate
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %