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A high-temperature, thermoplastic polymer. Introduced in 1982, polyether-imide (PEI) is transparent, tough and retains its properties to about 170C. It has good resistance to UV and gamma radiation. PEI is used as a reinforcing fiber and as a fire-resistant component in electrical boards, jet engines, and automobiles.

Synonyms and Related Terms

polyetherimide (AAT); PEI; Ultem [General Electric Co.]

Physical and Chemical Properties

  • Resistant to aliphatic hydrocarbons, alcohols, and dilute bases.
  • Resistant to high temperatures and to burning.
  • Tg = 215 C

Resources and Citations

  • Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
  • Hoechst Celanese Corporation, Dictionary of Fiber & Textile Technology (older version called Man-made Fiber and Textile Dictionary, 1965), Hoechst Celanese Corporation, Charlotte NC, 1990