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Acrylonitrile styrene acrylate

ASA for Outdoor and Sun-Exposed Parts

UV-stable and good to roughly 85–100 °C — the default for parts that live outside.

ASA is a close cousin of ABS, built for weather. It holds its colour and toughness in sunlight, which ABS does not, and its heat limit is far above PLA's or PETG's — published heat-deflection temperatures for common grades are roughly 85–100 °C at low load.

That combination makes ASA our default for anything that lives outdoors in North Texas: sensor and camera housings, equipment brackets, covers and shields for gear that sits in a yard, vehicle interior parts and signage hardware. It's tough, takes paint well and bonds well with adhesives.

The trade-off is printability. ASA shrinks as it cools, so large flat parts want to warp and corners can lift; it is printed hot, in an enclosed machine. We'll tell you if a geometry is going to fight the material and suggest changes — fillets, ribs, splitting a large flat panel — before it costs you a reprint.

ASA in Texas heat

In a closed car in summer

Yes, away from direct dash sun

Outdoors, year-round

Yes — first choice

If a part will spend its life outdoors in Dallas–Fort Worth — in sun that bleaches PLA and heat that softens PETG — ASA is the material we reach for first.

Where ASA works

  • Outdoor sensor, camera and instrument housings
  • Brackets and mounts on equipment that sits outside
  • Vehicle interior parts and trim
  • Covers and shields for outdoor equipment (non-rated)
  • Signage and wayfinding hardware
  • Agricultural, landscaping and yard-equipment parts

Where to use something else

  • Constant contact with solvents or fuels
  • Large, thin, flat panels (warping)
  • Loaded parts above about 90 °C
  • Enclosures that must carry a UL or flammability rating — printed ASA isn't certified

Designing parts in ASA

  • Add fillets to inside corners and break up large flat areas to reduce warping.
  • Dark colours run hotter in the sun. If you have the choice, a lighter colour keeps an outdoor part cooler.
  • ASA bonds well with adhesives and takes primer and paint, so multi-part assemblies and colour-matched finishes are practical.

ASA questions

ASA or PETG for outdoor use?

ASA. PETG is fine in shade or short-term, but ASA is formulated to resist UV and its heat limit is roughly 20 °C higher, which matters in a Texas summer.

What's the difference between ASA and ABS?

They print and perform similarly, with similar heat limits and toughness. ASA uses an acrylic rubber that resists UV; ABS yellows and turns brittle in sunlight. Indoors, either works. Outdoors, ASA.

Can ASA parts be painted?

Yes. ASA takes primer and paint well, and our finishing team can sand, prime and paint parts that need to match a colour.

Will ASA survive inside a hot car?

Usually, for interior parts out of direct dashboard sun — common grades are published at roughly 85–100 °C heat-deflection. For a part that sits right on the dash or near engine heat, talk to us about polycarbonate or carbon-fiber nylon.

Compare with

  • PETG — Tougher than PLA, good chemical resistance, heat limit of roughly 65–75 °C.
  • ABS — The classic housing plastic: roughly 85–100 °C heat limit, and it can be vapor-smoothed.
  • Polycarbonate — Very tough, with a heat limit of roughly 110–130 °C.
  • PLA vs PETG vs ASA vs Nylon

Check your part

Need a part in ASA — or not sure it's the right one?

Send your file and tell us where the part will live. A person quotes every job, usually within one business day, with a material recommendation if a different one would serve you better.

Get a Quote

Heat figures are typical published heat-deflection ranges for common filament grades at low load (0.45 MPa), not measurements of our parts. Real values vary with brand, colour, print orientation, part design and — for nylon — moisture. If a number matters to your application, tell us and we'll talk through margin and testing.