Unfilled SAN
Unfilled SAN is a grade of SAN. The graph bars on the material properties cards below compare unfilled SAN 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
3.6 GPa 0.52 x 106 psi
Elongation at Break
2.5 %
Flexural Modulus
3.8 GPa 0.55 x 106 psi
Flexural Strength
110 MPa 16 x 103 psi
Impact Strength: Notched Izod
23 J/m 0.44 ft-lb/in
Rockwell M Hardness
85
Tensile Strength: Ultimate (UTS)
74 MPa 11 x 103 psi
Thermal Properties
Glass Transition Temperature
120 °C 250 °F
Heat Deflection Temperature At 1.82 MPa (264 psi)
99 °C 210 °F
Heat Deflection Temperature At 455 kPa (66 psi)
100 °C 210 °F
Maximum Temperature: Autoignition
370 °C 700 °F
Maximum Temperature: Decomposition
390 °C 730 °F
Specific Heat Capacity
1380 J/kg-K 0.33 BTU/lb-°F
Thermal Conductivity
0.15 W/m-K 0.087 BTU/h-ft-°F
Thermal Expansion
54 µm/m-K
Vicat Softening Temperature
110 °C 220 °F
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 Hz
3.4
Dielectric Strength (Breakdown Potential)
70 kV/mm 2.7 V/mil
Otherwise Unclassified Properties
Density
1.1 g/cm3 67 lb/ft3
Limiting Oxygen Index (LOI)
18 %
Water Absorption After 24 Hours
0.26 %
Common Calculations
Stiffness to Weight: Axial
1.9 points
Stiffness to Weight: Bending
47 points
Strength to Weight: Axial
19 points
Strength to Weight: Bending
36 points
Thermal Diffusivity
0.1 mm2/s
Thermal Shock Resistance
27 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