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Unsaturated Polyester (UP)

UP is a thermoset plastic. It has the highest density among the thermoset plastics in the database. The graph bars on the material properties cards below compare UP to other thermoset plastics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

17 GPa 2.5 x 106 psi

Elongation at Break

1.0 %

Tensile Strength: Ultimate (UTS)

30 MPa 4.4 x 103 psi

Thermal Properties

Glass Transition Temperature

60 °C 140 °F

Specific Heat Capacity

1200 J/kg-K 0.29 BTU/lb-°F

Thermal Conductivity

0.7 W/m-K 0.4 BTU/h-ft-°F

Thermal Expansion

3.0 µm/m-K

Other Material Properties


2.0 g/cm3 120 lb/ft3

Dielectric Constant (Relative Permittivity) At 1 Hz


Limiting Oxygen Index (LOI)

20 %

Common Calculations

Stiffness to Weight: Axial

4.7 points

Stiffness to Weight: Bending

43 points

Strength to Weight: Axial

4.2 points

Strength to Weight: Bending

11 points

Thermal Diffusivity

0.29 mm2/s

Thermal Shock Resistance

42 points

Followup Questions

Further Reading

Thermosets: Structure, Properties and Applications, Qipeng Guo (editor), 2012

Modern Plastics Handbook, Charles A. Harper (editor), 1999

Plastics Materials, 7th ed., J. A. Brydson, 1999