Bottom line: for outdoor projects, ASA generally outperforms ABS because it resists UV and weathering far better. PETG is a lower-cost alternative with moderate weather resistance but lower heat resistance than ASA. The final choice depends on exposure time, temperature and mechanical load.
Comparison
| Property | ABS | ASA | PETG |
|---|---|---|---|
| UV resistance | low | high | moderate |
| Weather resistance | limited | good | moderate |
| Heat resistance | moderate | good | moderate |
| Impact resistance | good | good | good |
| Printing difficulty | high | high | medium |
| Cost | low | higher | medium |
Selection logic
- Long outdoor exposure: ASA.
- Indoor or short exposure with cost pressure: PETG.
- Legacy ABS designs: consider upgrading to ASA.
- High temperature plus outdoor: consider PC or ASA.
Costly mistakes
- Using ABS outdoors without protection.
- Assuming PETG matches ASA on UV.
- Ignoring layer orientation.
- No ageing test.
- Overlooking printing enclosure requirements.
Buyer / engineer checklist
- How long is the outdoor exposure?
- What temperature range applies?
- What mechanical load applies?
- Is the printer capable?
- Has ageing been tested?
Describe the exposure and load and we can recommend the best match.Material advice