PPA (Polyphthalamide)

PPA is a relatively new, semi-crystalline material, with an excellent cost to performance ratio. PPA bridges the performance gap between nylons/polyesters, and higher priced, high temperature materials such as PEI and PEEK. PPA has excellent impact strength and is not notch sensitive. PPA does absorb moisture, and its properties change as a result. This change is not nearly as great as 6-6 nylon. Despite its relatively recent introduction, good design data is available for PPA.

Applications: Automotive applications, Housing for high temperature electrical connectors, Multiple other uses as a replacement to metals.

Advantage

 

Heat resistance
Chemical resistance
Can resist infrared soldering environments
Relatively low moisture absorption
Strength or physical properties

Disadvantage

 

Not inherently flame retardant
Requires good drying equipment
High processing temperatures

Tensile StrengthFlexural ModulusImpact StrengthMax Temp.Chemical Resistance
9,000-33,000 psi270,000-2,700,000 psi.6-22 ft-lb/in notched izod300°-450° FGood to Great