Comparison
GPPS Sheet Extrusion vs PETG
A side-by-side comparison of General Purpose Polystyrene for Sheet Extrusion and Polyethylene Terephthalate Glycol.
Physical
Density
1.04-1.06 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.03-0.1 %
0.13 %
Transparency
Excellent
Transparent
Shrinkage
0.4-0.8 %
0.2 – 0.5 %
Mechanical
Young's Modulus
3.0-3.5 GPa
2.1 GPa
Tensile Strength
45-60 MPa
50 MPa
Elongation at Break
2-5 %
120 %
Impact Strength (Izod)
10-20 J/m
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
90-100 °C
80 °C
Melting Point
N/A (amorphous)
—
Continuous Service Temperature
60-70 °C
65 °C
Heat Deflection Temperature
70-80 °C
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
2.5-2.6
3.3
Volume Resistivity
10¹⁵-10¹⁶ Ω⋅cm
10¹⁴ Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Good resistance
Good
Bases
Good resistance
Fair
Solvents
Attacked by aromatic hydrocarbons, ketones, and esters
—
UV Resistance
Poor
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Recyclable
Recyclable
Recycling Code
6 (PS)
1
Carbon Footprint
Moderate
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %