PPA (semi-aromatic polyamide)

PPA + GF60 (Aromatic PA)

Higher heat resistance and stiffness than PA66, low moisture absorption; for high-temperature and metal-replacement parts.

Processing temperatures

Melt (injection) temperature	345 °C
Mold surface temperature	155 °C
Ejection temperature	200 °C

Typical values. They vary (±) with grade and manufacturer; see the data sheet.

Physical properties (typical)

Density	1.73 g/cm³
Shrinkage (flow / cross)	0.15 / 0.6 %
Specific heat	1 kJ/kg·K
Thermal conductivity	0.36 W/m·K
Latent heat of crystallization (approx.)	31 kJ/kg

Drying

Drying is essential.

For exact conditions see the material data sheet. Drying guide →

Points to watch

High melt and mold temperature (mold heating unit)
Very high pressure and abrasive fibers; wear of screw and mold steel

Typical use: Engine bay, cooling systems, electrical

Defects common with this material

Splay (silver streaks)

Fine silvery streaks on the part surface in the flow direction.

splay · silver streaks · moisture streaks

Brittleness / low impact strength

The part breaks more easily than expected; sometimes the surface looks fine.

brittleness · brittle part · cracking

Warpage

The part distorts or bends after it leaves the mold.

warpage · distortion · bowing

Sink mark

A dent on the surface opposite a thick section; the surface is drawn inwards.

sink mark · depression · sink

Dimensional variation and shrinkage differences

Part dimensions fall outside the tolerance or vary from cycle to cycle.

dimensional error · shrinkage · out of tolerance

Short shot (incomplete fill)

The cavity does not fill completely; the farthest or thinnest area of the part stays incomplete.

incomplete fill · underfill · non-fill

Other grades in the same family

Do the values for this material not match your grade? and we will correct them.