Polyphenyl ether

Polyphenyl ether (PPE), also known as polyphenylene and polyphenylene oxide (PPO), is a type of polyether.

The most common form of PPE is a plastic resin. PPE can be combined with other polymers to make useful plastic alloys. PPE is compatible with polystyrene (PS) and is blended with (usually high-impact) PS over a wide range of ratios.

Common uses for PPE include liquid barriers such as containers; water, atmosphere and electrical insulation (particularly for its stability over a wide temperature range); flame-retardants, filled and reinforced materials, foam and structural molding.

Applications include electrical insulation, liquid containers and plastic car parts such as bumpers and fenders.

PPE can also be alloyed with nylon plastic to provide increased resistance to organic chemicals and better high-temperature performance.