Unfilled PPO
Unfilled PPO is a grade of PPO. It has the lowest strength compared to the other variants of PPO. The graph bars on the material properties cards below compare unfilled PPO to: polyphenylene 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
2.4 GPa 0.35 x 106 psi
Elongation at Break
28 %
Flexural Modulus
2.5 GPa 0.37 x 106 psi
Flexural Strength
92 MPa 13 x 103 psi
Impact Strength: Notched Izod
270 J/m 5.0 ft-lb/in
Rockwell R Hardness
120
Tensile Strength: Ultimate (UTS)
63 MPa 9.1 x 103 psi
Thermal Properties
Glass Transition Temperature
210 °C 410 °F
Heat Deflection Temperature At 1.82 MPa (264 psi)
120 °C 260 °F
Heat Deflection Temperature At 455 kPa (66 psi)
140 °C 280 °F
Maximum Temperature: Autoignition
420 °C 790 °F
Maximum Temperature: Decomposition
440 °C 820 °F
Maximum Temperature: Mechanical
100 °C 220 °F
Melting Onset (Solidus)
280 °C 530 °F
Specific Heat Capacity
1250 J/kg-K 0.3 BTU/lb-°F
Thermal Conductivity
0.16 W/m-K 0.093 BTU/h-ft-°F
Thermal Expansion
60 µm/m-K
Vicat Softening Temperature
150 °C 310 °F
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 Hz
2.7
Dielectric Strength (Breakdown Potential)
19 kV/mm 0.74 V/mil
Electrical Dissipation At 1 Hz
0.0010
Electrical Resistivity Order of Magnitude
15 10x Ω-m
Otherwise Unclassified Properties
Density
1.1 g/cm3 67 lb/ft3
Limiting Oxygen Index (LOI)
32 %
Water Absorption After 24 Hours
0.070 %
Common Calculations
Stiffness to Weight: Axial
1.2 points
Stiffness to Weight: Bending
41 points
Strength to Weight: Axial
16 points
Strength to Weight: Bending
33 points
Thermal Diffusivity
0.12 mm2/s
Thermal Shock Resistance
31 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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015