Polyamide 6.6 (PA66): melt temperature, drying, shrinkage
Typical values for Polyamide 6.6 (PA66, semi-crystalline) in injection moulding: melt temperature 270–295 °C, mould temperature 80–100 °C, shrinkage 0.9–1.8 %, drying: 4 h at 80 °C. The processing window below shows melt and mould temperature on one scale; the app covers more than 150 materials.
Processing window
PA66 Polyamide 6.6, semi-crystalline
Melt temperature 270–295 °C
Mould temperature 80–100 °C
- Drying
- 4 h at 80 °C
- Density
- 1.14 g/cm³
- Cavity pressure
- 420–900 bar
- Shrinkage
- 0.9–1.8 %
Typical values for standard grades from the Resinovo material guide. They do not replace the manufacturer’s datasheet.
PA66 at a glance
Polyamide 6.6 has a higher melting temperature, stiffness and heat resistance than PA6. Typical uses are under-the-bonnet parts, connectors and technical housings.
Moisture-sensitive like PA6 and to be dried thoroughly. Because of the higher melt temperature, keep the residence time in the barrel short.
Processing data for PA66
- Melt temperature: 270–295 °C
- Mould temperature: 80–100 °C
- Drying: 4 h at 80 °C
- Density: 1.14 g/cm³
- Cavity pressure: 420–900 bar
- Processing shrinkage: 0.9–1.8 %
All values are typical figures for preselection. The manufacturer’s datasheet applies to the specific grade, and sampling on the machine decides the process.
Frequently asked questions
What processing temperature does PA66 have?
The melt temperature for Polyamide 6.6 is 270–295 °C and the mould temperature 80–100 °C (typical values).
Does PA66 have to be dried before processing?
Yes. Typical value for Polyamide 6.6: 4 h at 80 °C. The manufacturer’s datasheet for the grade in use is what counts.
How high is the shrinkage of PA66?
The processing shrinkage of Polyamide 6.6 is 0.9–1.8 %. It depends on wall thickness, holding pressure, mould temperature and grade.
What cavity pressure applies to PA66?
The range for Polyamide 6.6 is 420–900 bar. The clamping force calculator and the app start with the mean of 660 bar; you can adjust the value.
More on PA66 in the app
All properties
Flow behaviour, MVR and MFR, thermal conductivity, heat deflection, mechanical properties, fire rating and processing notes.
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Read on
- Clamping force calculator
- Shot volume calculator
- Cooling time calculation
- Injection moulding defects: causes and remedies
- Material guide: all values at a glance
More materials: PP · HDPE · ABS · ASA · PA6 · POM · PMMA · PC · PC/ABS · PET · PBT · PS · SAN · TPU · PEEK · PPS · PP-GF
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