Comparison
Acrylic (PMMA) vs PETG
A side-by-side comparison of Poly(methyl methacrylate) and Polyethylene Terephthalate Glycol.
Physical
Density
1.18 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.3 %
0.13 %
Transparency
Transparent (92%)
Transparent
Shrinkage
0.2 – 0.8 %
0.2 – 0.5 %
Mechanical
Young's Modulus
3.0 GPa
2.1 GPa
Tensile Strength
70 MPa
50 MPa
Flexural Strength
110 MPa
70 MPa
Impact Strength (Izod)
20 J/m
100 J/m
Elongation at Break
5 %
120 %
Thermal
Glass Transition Temperature
105 °C
80 °C
Continuous Service Temperature
80 °C
65 °C
Heat Deflection Temperature
95 °C
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
3.6
3.3
Volume Resistivity
10¹⁵ Ω·cm
10¹⁴ Ω·cm
Chemical resistance
Acids
Good
Good
Bases
Fair
Fair
Alcohols
Poor
Good
Acetone
Attacks
—
UV Resistance
Excellent
Fair
Oils
—
Good
Sustainability
Recyclability
Recyclable (chemical)
Recyclable
Recycling Code
7
1
Carbon Footprint
~5.4 kg CO₂e / kg
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %