Comparison

PP Homopolymer Injection vs Polycarbonate

A side-by-side comparison of Polypropylene Homopolymer for Injection Molding and Polycarbonate.

Property

PP Homopolymer Injection

Polycarbonate

Physical

Density

0.900-0.915 g/cm³

1.20 g/cm³

Water Absorption (24h)

<0.05 %

0.15 %

Transparency

Can be translucent to opaque

Transparent (88% light transmission)

Shrinkage

1-2.5 %

0.5 – 0.8 %

Mechanical

Young's Modulus

1.2-1.7 GPa

2.3 – 2.4 GPa

Tensile Strength

30-40 MPa

60 – 70 MPa

Elongation at Break

2-10 %

100 – 150 %

Impact Strength (Izod)

50-100 J/m

600 – 900 J/m

Flexural Strength

—

90 – 100 MPa

Hardness (Rockwell M)

—

Thermal

Glass Transition Temperature

-10 °C

147 °C

Melting Point

160-170 °C

—

Continuous Service Temperature

80-100 °C

115 – 130 °C

Heat Deflection Temperature

60-80 °C

130 – 140 °C

Thermal Conductivity

—

0.20 W/m·K

CTE

—

65 – 70 × 10⁻⁶ /K

Electrical

Dielectric Constant

2.2-2.3

2.9 – 3.0

Volume Resistivity

>10¹⁶ Ω⋅cm

10¹⁶ Ω·cm

Dielectric Strength

20-30 kV/mm

15 kV/mm

Chemical resistance

Acids

Excellent resistance

—

Bases

Excellent resistance

Poor

Solvents

Good resistance at room temperature, swells in hot aromatic and chlorinated hydrocarbons

—

UV Resistance

Poor (requires stabilization)

Poor (unless coated)

Acids (dilute)

—

Good

Alcohols

—

Fair

Oils

—

Good

Gasoline

—

Fair

Acetone

—

Poor (attacks)

Sustainability

Recyclability

Recyclable

Recycling Code

5 (PP)

Carbon Footprint

Moderate

~5 kg CO₂e / kg

Bio-based Content

—

0 – 50 % (bio grades)