Polyphenylene Oxide - Modified - PPO 30% Glass Fibre Reinforced

Although unchanged PPO is a semi-crystalline thermoplastic, all commercially available grades are blended with (high impact) polystyrene in order to improve melt processability.

A broad range of proportions, along with the use of other modifiers, results in a good range of grades with varying properties tailor-made to the requirements of individual end-uses.


Good rigidity, tensile strength, heat distortion temperature and increased maximum operating temperature combined with low warp and shrinkage compared with unmodified PPO.

These blends are opaque, amorphous, pale grey engineering thermoplastics with a balance of properties (and cost) not unlike nylon but without nylon's high water absorption and resulting dimensional instability.

However, they have poor fatigue features and poor solvent, though good hydrolysis, resistance.


Reduced elongation at break and notched izod impact strength compared with unmodified PPO. Physical properties of moulding can be highly anisotropic.


Polyphenylene Oxide can be used in the automotive industry, for components in heating systems, radiator and expansion tanks, bulb sockets, mirror housings, air inlet and outlet grills. PPO can also be used as a metal replacement in pumps and components for central heating systems.

Other applications include;

  • washing and dish-washing machine parts,
  • electrical and TV components,
  • automobile parts (particularly fascias)
  • structural foam

Image Credit: ShutterStock/Bachtub Dmitrii

Image Credit: ShutterStock/Bachtub Dmitrii

Typical Properties

Property Value
Density (g/cm3) 1.27
Surface Hardness RR130
Tensile Strength (MPa) 120
Flexural Modulus (GPa) 9
Notched Izod (kJ/m) 0.1
Linear Expansion (/°C x 10-5) 2.5
Elongation at Break (%) 3
Strain at Yield (%) N/A
Max. Operating Temp. (°C) 90
Water Absorption (%) 0.06
Oxygen Index (%) 26
Flammability UL94 HB
Volume Resistivity (log ohm.cm) 17
Dielectric Strength (MV/m) 15
Dissipation Factor 1 kHz 0.01
Dielectric Constant 1 kHz 2.9
HDT @ 0.45 MPa (°C) 165
HDT @ 1.80 MPa (°C) 158
Material. Drying hrs @ (°C) 2 @ 100
Melting Temp. Range (°C) 250 - 300
Mould Shrinkage (%) 0.2
Mould Temp. Range (°C) 80 - 110

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.

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