# Unfilled ABS

Unfilled ABS is a grade of ABS. It has the second highest ductility compared to the other variants of ABS. The graph bars on the material properties cards below compare unfilled ABS to: styrenic plastics (top), all thermoplastics (middle), 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

2.0 *GPa* 0.28 *x 10 ^{6} psi*

Elongation at Break

20 *%*

Flexural Modulus

2.1 *GPa* 0.3 *x 10 ^{6} psi*

Flexural Strength

97 *MPa* 14 *x 10 ^{3} psi*

Fracture Toughness

2.0 *MPa-m ^{1/2}* 1.8

*x 10*

^{3}psi-in^{1/2}Impact Strength: Notched Izod

320 *J/m* 6.0 *ft-lb/in*

Poisson's Ratio

0.41

Tensile Strength: Ultimate (UTS)

41 *MPa* 5.9 *x 10 ^{3} psi*

## Thermal Properties

Glass Transition Temperature

100 *°C* 210 *°F*

Heat Deflection Temperature At 1.82 MPa (264 psi)

95 *°C* 200 *°F*

Heat Deflection Temperature At 455 kPa (66 psi)

100 *°C* 220 *°F*

Maximum Temperature: Autoignition

400 *°C* 740 *°F*

Maximum Temperature: Decomposition

390 *°C* 730 *°F*

Maximum Temperature: Mechanical

80 *°C* 180 *°F*

Specific Heat Capacity

1400 *J/kg-K* 0.33 *BTU/lb-°F*

Thermal Conductivity

0.23 *W/m-K* 0.13 *BTU/h-ft-°F*

Thermal Expansion

95 *µm/m-K*

Vicat Softening Temperature

100 *°C* 220 *°F*

## Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz

3.2

Dielectric Strength (Breakdown Potential)

16 *kV/mm* 0.61 *V/mil*

Electrical Resistivity Order of Magnitude

13 *10 ^{x} Ω-m*

## Otherwise Unclassified Properties

Density

1.1 *g/cm ^{3}* 66

*lb/ft*

^{3}Limiting Oxygen Index (LOI)

25 *%*

Water Absorption After 24 Hours

0.3 *%*

Water Absorption At Saturation

0.7 *%*

## Common Calculations

Stiffness to Weight: Axial

1.0 *points*

Stiffness to Weight: Bending

39 *points*

Strength to Weight: Axial

11 *points*

Strength to Weight: Bending

25 *points*

Thermal Diffusivity

0.15 *mm ^{2}/s*

Thermal Shock Resistance

16 *points*

## Followup Questions

## Further Reading

SPI Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 5th ed., Michael L. Berins (editor), 2000

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

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