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This technology profile features various key facts about polyphthalamide. It includes their strengths & limitations, processing guidelines, key features and applications.


  • Polyphthalamide (PPA) resins are semiaromatic polyamides. 
  • Both amorphous and crystalline grades are available.
  • Polyphthalamide are stronger, less moisture sensitive and possess better thermal properties compared to the aliphatic polyamides such as PA66.
  • However, they are less ductile in comparison although impact grades are available.
  • PPA have good strength and stiffness along with good chemical resistance.
  • They are prone to attack by strong acids or oxidizing agents and are soluble in cresol and phenol.
  • The material can be reinforced with glass and has extremely good high-temperature performance. 
  • Polyphthalamide resin features an excellent stiffness-to-cost ratio and a high strength-to-weight ratio, both of which are superior relative to PBT, PPS, PEI, PET and PA 66.
  • Its thermal performance is exceeded only by polyetheretherketone (PEEK) and some Liquid Crystal Polymers.
  • Its warpage and dimensional stability match PPS.
  • PPA resin has lower moisture absorption than nylon 66.
  • Its broad chemical resistance is exceeded only by a handful of more costly specialty polymers.
  • Polyphthalamide resins are used in automotive, electrical components, hardware and plumbing, sporting goods, oil field parts, and military applications.

Polyphthalamide strengths and limitations

  Strengths and Limitations

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