Comparison
POM (Delrin) vs PETG
A side-by-side comparison of Polyoxymethylene and Polyethylene Terephthalate Glycol.
Physical
Density
1.41 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.25 %
0.13 %
Transparency
Opaque
Transparent
Shrinkage
1.8 – 2.5 %
0.2 – 0.5 %
Mechanical
Young's Modulus
3.1 GPa
2.1 GPa
Tensile Strength
70 MPa
50 MPa
Flexural Strength
100 MPa
70 MPa
Impact Strength (Izod)
70 J/m
100 J/m
Elongation at Break
25 %
120 %
Thermal
Melting Point
175 °C
—
Continuous Service Temperature
100 °C
65 °C
Heat Deflection Temperature
110 °C
70 °C
Glass Transition Temperature
—
80 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
3.7
3.3
Volume Resistivity
10¹⁴ Ω·cm
10¹⁴ Ω·cm
Chemical resistance
Acids
Poor
Good
Bases
Excellent
Fair
Solvents
Excellent
—
UV Resistance
Fair
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Recyclable
Recyclable
Recycling Code
7
1
Carbon Footprint
~4 kg CO₂e / kg
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %