PPA vs ASA
Compare PPA and ASA filaments side-by-side so you can pick the right one for your 3D printing project.
PPA vs ASA: PPA is known for semi-aromatic nylon: aromatic rings in the backbone push..., while ASA is known for excellent uv resistance (outdoors indefinitely). ASA is easier to print; PPA prints at higher nozzle temperatures (280-310°C vs 220-275°C). Choose PPA for semi-aromatic nylon: aromatic rings in the backbone push..., or ASA for excellent uv resistance (outdoors indefinitely).
Key differences at a glance
PPA
CPolyphthalamide
Semi-aromatic nylon: aromatic rings in the backbone push Tg to ~130C and the melting point to ~300C
ASA
AAcrylonitrile Styrene Acrylate
Excellent UV resistance (outdoors indefinitely), tough, matte surface
Detailed Comparison
Green marks the generally easier or more forgiving option in that row, based on tier, enclosure needs, and moisture sensitivity. It is not always the better choice for a specific job, so weigh it against what your project actually needs.
Strengths Comparison
PPA Strengths
- Semi-aromatic nylon: aromatic rings in the backbone push Tg to ~130C and the melting point to ~300C
- Holds strength, stiffness and dimensions at temperatures where PA6, ABS and PETG soften
- Strong resistance to oils, greases, fuels and industrial chemicals
- Absorbs far less moisture than PA6, so properties stay consistent in humid air
ASA Strengths
- Excellent UV resistance (outdoors indefinitely), tough, matte surface
- Less warping than ABS; low viscosity enables very high speed printing
- High heat tolerance (~boiling water range)
Considerations
PPA Caveats
- Needs a ~300C-capable all-metal hotend and an enclosure, which rules out most desktop printers
- Unfilled PPA is usually the wrong buy: most commercial 3D printing PPA is sold carbon- or glass-filled
- Expensive, and demanding drying (roughly 100-140C) before every print
ASA Caveats
- Still off-gasses; enclosure/ventilation recommended
- Can still warp; needs tuning