# Urea Formaldehyde (UF)

UF is a thermoset plastic. It has a fairly high dielectric strength among the thermoset plastics in the database. The graph bars on the material properties cards below compare UF 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

9.0 *GPa* 1.3 *x 10 ^{6} psi*

Elongation at Break

1.0 *%*

Tensile Strength: Ultimate (UTS)

30 *MPa* 4.4 *x 10 ^{3} psi*

## Thermal Properties

Specific Heat Capacity

1200 *J/kg-K* 0.29 *BTU/lb-°F*

Thermal Conductivity

0.4 *W/m-K* 0.23 *BTU/h-ft-°F*

Thermal Expansion

55 *µm/m-K*

## Other Material Properties

Density

1.5 *g/cm ^{3}* 94

*lb/ft*

^{3}Dielectric Strength (Breakdown Potential)

35 *kV/mm* 1.4 *V/mil*

Electrical Resistivity Order of Magnitude

9.0 *10 ^{x} Ω-m*

## Common Calculations

Stiffness to Weight: Axial

3.3 *points*

Stiffness to Weight: Bending

46 *points*

Strength to Weight: Axial

5.6 *points*

Strength to Weight: Bending

14 *points*

Thermal Diffusivity

0.22 *mm ^{2}/s*

Thermal Shock Resistance

4.3 *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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015