Comparison

Rigid Unsaturated Polyester vs ABS

A side-by-side comparison of Unsaturated Polyester Resin and Acrylonitrile Butadiene Styrene.

Property

Rigid Unsaturated Polyester

ABS

Physical

Density

1.10-1.30 g/cm³

1.04 – 1.07 g/cm³

Water Absorption (24h)

0.2-0.8 %

0.20 – 0.45 %

Transparency

Clear to Opaque

Opaque

Shrinkage

4-8 %

0.4 – 0.9 %

Specific Gravity

—

1.05

Surface Finish

—

Matte to glossy

Mechanical

Young's Modulus

2.0-3.5 GPa

1.8 – 2.5 GPa

Tensile Strength

40-70 MPa

40 – 50 MPa

Elongation at Break

1-3 %

10 – 50 %

Impact Strength (Izod)

8-20 J/m

200 – 400 J/m

Flexural Strength

—

60 – 80 MPa

Hardness (Rockwell R)

—

100 – 115

Thermal

Glass Transition Temperature

50-100 °C

105 °C

Melting Point

N/A

Amorphous (no true Tm)

Continuous Service Temperature

60-120 °C

70 – 90 °C

Heat Deflection Temperature

50-90 °C

85 – 100 °C

Thermal Conductivity

—

0.17 W/m·K

CTE

—

80 – 100 × 10⁻⁶ /K

Electrical

Dielectric Constant

4.0-5.5

2.7 – 3.2

Volume Resistivity

10^12-10^14 Ohm-cm

10¹⁶ Ω·cm

Dielectric Strength

15-25 kV/mm

15 – 20 kV/mm

Surface Resistivity

—

10¹⁵ Ω

Chemical resistance

Acids

Moderate resistance

—

Bases

Poor resistance

Good

Solvents

Resistant to hydrocarbons and esters

—

UV Resistance

Poor without additives

Poor (unless stabilized)

Acids (dilute)

—

Good

Alcohols

—

Good

Oils & Greases

—

Fair

Gasoline

—

Poor

Acetone

—

Attacks / dissolves

Weathering

—

Poor without stabilizers

Sustainability

Recyclability

Difficult

Recyclable (mechanical)

Recycling Code

N/A

7 (Other)

Carbon Footprint

Moderate

~3.1 kg CO₂e / kg

Bio-based Content

—

0 %