Polyphenylene Oxide (PPO)

Polyphenyleneoxide (PPO) is one of those high-performance polymers we like to call engineering thermoplastics. Its biggest strength is its resistance to high temperatures. It has a very high glass transition temperature, 210 oC. But there’s a price for being heat-resistant. Most polymers are processed at high temperature in a liquid-like state. But if your polymer won’t become liquid-like at reasonable temperatures, you can’t process it! For this reason, PPO is often made into blends with high-impact polystyrene (HIPS for short). Blending PPO with HIPS makes the PPO easier to process, plus it gives PPO some resilience. PPO needs this toughening because by itself PPO can be brittle in some situations.


General Properties :
Chemical Resistance
Acids – concentrated Fair
Acids – dilute Good
Alcohols Fair
Alkalis Good
Aromatic hydrocarbons Poor
Greases and Oils Fair
Halogens Poor
Ketones Fair
Electrical Properties
Dielectric constant @1MHz 2.7
Dielectric strength ( kV.mm-1) 16 to 20
Dissipation factor @ 1kHz 0.004
Surface resistivity ( Ohm/sq ) 2×1016
Volume resistivity ( Ohm.cm ) 1017
Mechanical Properties
Abrasive resistance – ASTM D1044 ( mg/1000 cycles ) 20
Coefficient of friction 0.35
Elongation at break ( % ) 50
Hardness – Rockwell M78/R115
Izod impact strength ( J.m-1 ) 200
Poisson’s ratio 0.38
Tensile modulus ( GPa ) 2.5
Tensile strength ( MPa ) 55-65
Physical Properties
Density ( g.cm-3 ) 1.06
Flammability HB
Limiting oxygen index ( % ) 20
Resistance to Ultra-violet Good
Water absorption – over 24 hours ( % ) 0.1-0.5
Physical Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 60
Heat-deflection temperature – 0.45MPa ( °C ) 137
Heat-deflection temperature – 1.8MPa ( °C ) 125
Lower working temperature ( °C ) -40
Thermal conductivity ( W.m-1.K-1 ) 0.22 @ 23
Upper working temperature ( °C ) 80-120

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