Tuesday, 7 September 2021

Design Properties for Engineers – Comparison Property Data of Polyphthalamides (PPAs)

 Hello and welcome to a new post. In this post I provide you engineering comparison data of the 5 most used PPA base polymers and their glass-fiber reinforced compounds. Semi-aromatic polyamides are used when the aliphatic counterparts reach their limits due to high temperature and/or mechanical loads.

The five base polymers of PPA are:

-PA 6T/6.6

-PA 6T/6I/6.6

-PA 6T/6I


-PA 10T/X

The data are shown in property vs. density plots and we are comparing the semi-aromatic polyamides to aliphatic polymers.  


Semi-aromatic polyamides have an amide linkage together with an aromatic ring. The aromatic content is most of times derived from 2-methylpentanediamine (DT), terephthalic acid (TPA) and/or isophthalic acid (IPA). In general, the aromatic structure helps to increase the glass transition temperature, which in turn increases the thermal and chemical resistance. Furthermore, reduction in water uptake is achieved. More details can be found in this post.

The following properties are presented in the below infographic (PPA reinforced with 50% glass fibers):

-Glass transition temperature

-Melt temperature

-Tensile strength (dry as moulded; conditioned)

-Tensile modulus (dry as moulded; conditioned)

-Heat Deflection Temperature (HDT; 1.8 MPa)

-Izod notched impact strength

Design Properties for Engineers – Comparison Property Data of Polyphthalamides (PPAs)

Thanks for reading and #findoutaboutplastics



Interested to talk with me about your plastic selection and part design needs - here you can contact me 

Interested in my monthly blog posts – then subscribe here and receive my high performance polymers knowledge matrix.
New to my Find Out About Plastics Blog – check out the start here section
Polymer Material Selection (PoMS) for Electric Vehicles (xEVs) - check out my new online course


[1] D. Kemmish: Practical Guide to High Performance Engineering Plastics, Smithers

[2] D. Glasscock: High Performance Polyamides Fulfill Demanding Requirements for Automotive Thermal Management Components, DuPont Engineering Polymers

[3] Eurotec: Tecomid High Performance Compounds

[4] Saechtling Kunststoff Taschenbuch, Hanser

No comments:

Post a Comment