EN
DE
Plastic Annealing Process Parameters Reference Table
The following is a reference table of plastic annealing process conditions for common plastic materials, including key parameters such as temperature, time, cooling method, etc., which are suitable for eliminating internal stress after injection molding or machining.
Plastic Annealing Process Parameters Reference Table |
|||||
| Polymer Type | Annealing Temp. Range (°C) | Annealing Time (min/mm thickness) | Cooling Method | Application Scenario | Key Considerations |
| ABS | 70–90 | 30–60 (or 2–4 hrs) | Slow oven cooling (<50°C) | Stress relief for molded parts, dimensional stability | Avoid >100°C to prevent deformation |
| PC | 110–130 | 30–60 (or 4–6 hrs) | Oven cool (≤10°C/h) | Transparent parts, crack prevention | Excessive heat may cause yellowing |
| PMMA | 70–85 | 60–180 | Air cool | Optical components, birefringence reduction | Ensure uniform heating |
| PA6/PA66 | 80–120 (PA6) | 15–30 (or 0.5 hr/mm) | Slow air cool | Post-hygroscopic dimensional adjustment, toughness enhancement | Pre-dry material before annealing |
| 100–150 (PA66) | |||||
| POM | 90–120 | 20–40 (or 1–2 hrs) | Oven cool to 60°C then air cool | Reduce crystalline stress, prevent microcracks | Avoid rapid cooling to prevent recrystallization |
| PP | 80–110 | 30–60 | Air cool | Improve low-temperature toughness and creep resistance | High temps may alter shrinkage |
| PS | 60–80 | 30–90 | Slow cool | Reduce stress-induced crazing | Avoid solvent exposure |
| PET | 120–150 | 30–60 (or 2–4 hrs) | Oven cool (≤5°C/h) | Enhance crystallinity, mechanical strength | Strict temperature uniformity required |
| PVC (Rigid) | 60–80 | 30–60 | Air cool | Prevent stress cracking, improve weatherability | Avoid >90°C to prevent degradation |
| PEEK | 200–250 | 60–120 (or 1 hr/mm) | Oven cool (≤15°C/h) | High-performance part stress relief | Requires nitrogen atmosphere |
Additional Notes
Equipment:
- Use circulating air ovens or oil baths (±3°C uniformity).
- For large parts: IR heating or localized annealing.
Thickness Impact
- Time guideline: 0.5–1 hour/mm thickness (extend for thick sections).
Cooling Control:
- Oven cooling: Critical for PC/PET (rate ≤10°C/h).
- Air cooling: For semi-crystalline polymers (PP/PA) – avoid forced cooling.
Validation Methods:
- Polarized light inspection (for transparent PC/PMMA).
- Solvent testing (e.g., ABS with glacial acetic acid).
Special Cases
- Glass-filled grades: Increase temp by 10–20°C and time by 20%.
- Machined parts: Use 10–15°C lower than molding annealing temps.
Get In Touch
Our senior sales and technical engineers will answer you questions fast and efficient.