Comparison

MDPE Pipe Grade vs PA66

A side-by-side comparison of Medium-Density Polyethylene Pipe Grade and Polyamide 6,6 (Nylon).

Property

MDPE Pipe Grade

PA66

Physical

Density

0.930-0.940 g/cm³

1.14 g/cm³

Water Absorption (24h)

<0.05 %

1.2 %

Transparency

Opaque

Shrinkage

2-4 %

1.5 – 2.0 %

Mechanical

Young's Modulus

0.4-0.7 GPa

3.0 GPa (dry)

Tensile Strength

15-25 MPa

80 MPa

Elongation at Break

150-400 %

60 %

Impact Strength (Izod)

No Break

50 J/m

Flexural Strength

—

110 MPa

Thermal

Glass Transition Temperature

-120 °C

70 °C

Melting Point

118-128 °C

255 – 265 °C

Continuous Service Temperature

70-80 °C

100 – 120 °C

Heat Deflection Temperature

45-55 °C

75 °C (unfilled)

Electrical

Dielectric Constant

2.25-2.35

4.0

Volume Resistivity

>10¹⁵ Ω⋅cm

10¹² Ω·cm

Dielectric Strength

15-25 kV/mm

—

Chemical resistance

Acids

Excellent resistance

Poor

Bases

Excellent resistance

Good

Solvents

Good resistance at room temperature, swells in hot aromatic hydrocarbons

—

UV Resistance

Poor (requires stabilization)

Fair

Alcohols

—

Good

Oils & Fuels

—

Excellent

Sustainability

Recyclability

Recyclable

Recycling Code

2 (PE-HD)

Carbon Footprint

Moderate

~7.4 kg CO₂e / kg

Bio-based Content

—

0 – 100 % (bio grades)