PPA / PA 10T / PA 6T (Polyphthalamide)

PPA- partially-aromatic polyamides are half-crystalline aromatic polyamides (PA).  They are classified as thermoplasts and have different properties than aliphatic and aromatic polyamides.   

Monomers that are used for the production of PPA are α, ω-diamine with various chain lengths and benzene dicarboxylic acid, terephthalic acid, or isophthalic acid. 

The numbers following the PA label represent the number of carbon atoms within the monomer.  Letters are also used as abbreviated descriptions for some monomers.  For example, “T” is the abbreviation for terephthalic acid and “I” is for isophthalic acid.     

Properties: 

Polyphthalamide is, due to its partly-aromatic structure, a partially-crystalline material with a high melting point and a higher glass-transition temperature of up to 150°C.  The glass-transition temperature increases with the amount of terephthalic acid.  Polyphthalamide possess a high heat resistance of more than 280°C.  Moisture absorption is 0, 1% - 0, 3%, which is lower than other polyamides.  Polyphthalamide have a high chemical resistance, also against aggressive chemicals. 

  1. High tensile strength and stiffness
  2. E-Modulus of glass-fiber reinforced PPA´s can withstand up to 20,000 MPa
  3. High notch impact strength
  4. Unchanging mechanical properties by high dimensional stability
  5. Low warpage
  6. High creep resistance
  7. High wear resistance
  8. Low coefficient of friction
  9. Good sliding characteristics by high temperatures
  10. Good isolating properties
  11. Low conductivity
  12. High tracking index
  13. High specific volume resistance
  14. High surface resistance
Areas of Application: 

Can be used for various applications within the drinking water sector, as well as for applications in medical technology for the development of catheters.  Due to its high resistance against corrosion, PPA can also be used to cover soldered joints.  PPA´s adhere directly to a large number of elastomers without the use of a bonding agent, for example, plastic-rubber-compounds.  The material can also be processed as fibers and filaments for highly strained bristles. PPA is often used as a substitution for metals, especially in applications where high heat resistance along with high mechanical stability and low moisture absorption are required.   Typical applications for this material are: connecting piping (for gases, fuels, coolants, etc.); pumps, valves, and filtering systems; cables and sockets for LED applications; 3D circuit carriers; electrical insulators and switches; as well as coatings to reduce adhesion.  Flame retardant PPA can also be used for building components for lead-free reflow soldering. Injection molded parts can be glued, riveted, welded, painted, and are mechanically workable.    

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