Comparison

POM (Delrin) vs PEEK

A side-by-side comparison of Polyoxymethylene and Polyether Ether Ketone.

Property

POM (Delrin)

PEEK

Physical

Density

1.41 g/cm³

1.32 g/cm³

Water Absorption (24h)

0.25 %

0.15 %

Transparency

Opaque

Opaque (amber)

Shrinkage

1.8 – 2.5 %

1.1 – 1.4 %

Mechanical

Young's Modulus

3.1 GPa

3.6 GPa

Tensile Strength

70 MPa

100 MPa

Flexural Strength

100 MPa

170 MPa

Impact Strength (Izod)

70 J/m

55 J/m

Elongation at Break

25 %

50 %

Thermal

Melting Point

175 °C

343 °C

Continuous Service Temperature

100 °C

260 °C

Heat Deflection Temperature

110 °C

160 °C

Glass Transition Temperature

—

143 °C

Electrical

Dielectric Constant

3.7

3.2

Volume Resistivity

10¹⁴ Ω·cm

10¹⁶ Ω·cm

Chemical resistance

Acids

Poor

Excellent

Bases

Excellent

Solvents

Excellent

UV Resistance

Fair

Hydrolysis (steam)

—

Excellent

Sustainability

Recyclability

Recyclable

Recyclable (specialty)

Recycling Code

Carbon Footprint

~4 kg CO₂e / kg

~30 kg CO₂e / kg