Comparison
SMA Standard vs PETG
A side-by-side comparison of Styrene Maleic Anhydride Standard and Polyethylene Terephthalate Glycol.
Physical
Density
1.05-1.10 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.1-0.3 %
0.13 %
Transparency
Opaque or Transparent (depending on grade)
Transparent
Shrinkage
0.4-0.7 %
0.2 – 0.5 %
Mechanical
Young's Modulus
2.5-3.5 GPa
2.1 GPa
Tensile Strength
45-60 MPa
50 MPa
Elongation at Break
5-15 %
120 %
Impact Strength (Izod)
5-10 kJ/m
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
90-120 °C
80 °C
Melting Point
N/A (amorphous)
—
Continuous Service Temperature
60-80 °C
65 °C
Heat Deflection Temperature
80-100 °C (1.8 MPa)
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
2.7-3.0
3.3
Volume Resistivity
10^13-10^15 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
16-20 kV/mm
—
Chemical resistance
Acids
Good
Good
Bases
Poor
Fair
Solvents
Poor
—
UV Resistance
Poor
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Recyclable
Recyclable
Recycling Code
7 (Other)
1
Carbon Footprint
Moderate
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %