| Attribute | ASA Filament | PLA Filament |
|---|---|---|
| Polymer Name | Acrylonitrile Styrene Acrylate (ASA) | Polylactic Acid (PLA) |
| Typical Nozzle Range (°C) | 260 ± 10 | 210 ± 10 |
| Typical Bed Range (°C) | 110 ± 5 | 40–60 |
| Glass Transition, Tg (°C) | 108 | 59.1 |
| HDT @ ~0.45 MPa (°C) | 93 | 58.8 |
| Density (g/cm³) | 1.07 | 1.24 |
| Tensile Yield Strength (Printed, MPa) | 42–45 | 52.5–59.0 |
| Tensile Modulus (Printed) | 1.6–1.7 GPa | 3.07–3.29 GPa |
| Moisture Absorption (24h, %) | 0.16 | 0.13 |
| Cooling Fan (Typical) | 0–50% | 100% |
Numbers above are reference values from published technical data sheets and can vary with brand, color, and test method. For ASA print temperatures and HDT in this table, see: ✅Source
- Material Identity and Base Chemistry
- ASA in Plain Terms
- PLA in Plain Terms
- Thermal Behavior in Real Life
- Weather and UV Exposure
- Printing Temperature Windows
- Mechanical Profile: Stiffness and Load Response
- ASA Mechanical Signals
- PLA Mechanical Signals
- Moisture and Storage Sensitivity
- Application Fit: Where Each One Shines
- ASA Material Fit
- PLA Material Fit
- Relative Snapshot Meters
- Datasheet Fields That Matter Most
If your project sits between easy detail and real-world durability, the ASA filament vs PLA filament choice matters fast. PLA is known for clean surfaces and predictable shapes, while ASA is built for warm, sunlit environments where dimensional stability stays important. This page focuses on measurable properties, datasheet numbers, and what those values really mean for printed parts.
Material Identity and Base Chemistry
ASA in Plain Terms
ASA stands for Acrylonitrile Styrene Acrylate. In practice, ASA filament is often selected when the environment includes sunlight, heat, and outdoor exposure. Many ASA datasheets also publish a higher HDT and higher Tg than common desktop materials, which supports steady geometry in warm conditions.
PLA in Plain Terms
PLA stands for Polylactic Acid. In filament form, PLA filament is widely used for clean surface quality, sharp edges, and stable printing at lower temperatures. Typical PLA profiles pair a moderate nozzle range with stronger cooling, which supports fine details and consistent layer lines. For a deeper look at how different PLA variants behave in 3D printing—including PLA+, HT-PLA, and other modified formulations—see the Ultimate PLA Filament Guide.
Thermal Behavior in Real Life
- Glass Transition (Tg)
- Tg is where a plastic shifts toward a softer, rubbery response. It is a key clue for how a printed part behaves in warm surroundings.
- Heat Deflection Temperature (HDT)
- HDT indicates when a standardized, loaded sample begins to deflect under heat. It’s useful for comparing heat resistance between materials.
ASA filament typically shows a notably higher glass transition than common PLA. Stratasys lists Tg ≈ 108 °C for ASA, alongside HDT values in the high double digits, which aligns with ASA’s reputation for warm environments. ✅Source
For PLA filament, the softening threshold arrives sooner. UltiMaker’s PLA technical sheet reports Tg 59.1 °C and HDT 58.8 °C (under ISO 75 conditions for the printed samples). That temperature band is why PLA is so common for indoor parts and display models where detail and surface finish matter most. ✅Source
Weather and UV Exposure
ASA is often described as a UV-stable material for outdoor-capable parts. Stratasys explicitly positions ASA as having exceptional UV stability, which is why ASA shows up in applications that live under sunlight and shifting seasons. ✅Source
PLA is commonly treated as an indoor-focused choice. UltiMaker’s PLA sheet flags long term outdoor usage as not suitable for their PLA and also calls out exposure above 59 °C as outside the intended use, which fits the Tg/HDT picture you saw earlier. ✅Source
Printing Temperature Windows
ASA filament usually runs in a higher nozzle temperature window and prefers a hotter heated bed. One published ASA profile lists 260 ± 10 °C at the nozzle and 110 ± 5 °C at the bed, reflecting ASA’s preference for stable heat during printing. ✅Source
PLA filament generally prints cooler and pairs well with strong cooling. A published PLA profile lists 210 ± 10 °C nozzle temperature and 40–60 °C bed temperature, which fits PLA’s friendly melt behavior and crisp detail. ✅Source
Small but useful detail: temperature windows are not just about melting. They also influence layer bonding, surface gloss, and edge sharpness. That’s why the same material can look different across brands, even when the label says ASA or PLA.
Mechanical Profile: Stiffness and Load Response
ASA Mechanical Signals
- Printed tensile yield: 42–45 MPa (example published values)
- Printed tensile modulus: 1.6–1.7 GPa
- Charpy impact (unnotched): ~25–38 kJ/m² (direction-dependent)
- HDT (0.45 MPa): 93 °C
These figures show how ASA filament tends to balance toughness with heat stability, especially when parts face warm, real-world conditions. ✅Source
PLA Mechanical Signals
- Printed tensile modulus: 3.07–3.29 GPa
- Printed tensile stress at yield: 52.5–59.0 MPa (orientation-dependent)
- Charpy impact (notched): ~3.9 kJ/m² (example published value)
- Glass transition: 59.1 °C
These numbers show why PLA filament often feels rigid and supports sharp detail in printed shapes, especially at room temperature. ✅Source
Moisture and Storage Sensitivity
Even “easy” materials benefit from dry storage, since moisture can influence surface, consistency, and layer quality. For PLA, one published datasheet lists 0.13% moisture absorption over 24 hours (typical value), which is low but still meaningful over time in humid rooms. ✅Source
For ASA, a published ASA datasheet lists 0.16% moisture absorption over 24 hours (typical value). The number is in the same neighborhood as PLA, so the practical takeaway is simple: sealed storage helps keep both materials behaving consistently. ✅Source
Application Fit: Where Each One Shines
ASA Material Fit
- Outdoor housings where UV stability matters
- Warm environments where Tg and HDT headroom helps
- Functional prototypes that need a tough feel and steady dimensions
- Parts with matte aesthetics and a professional look (often mentioned for ASA)
PLA Material Fit
- Visual models where clean surfaces and sharp edges
- Indoor parts that stay near room temperature
- Prototypes where dimensional accuracy and crisp features are the main goal
- Fast iteration thanks to lower temperature profiles and strong cooling
Relative Snapshot Meters
These meters are a relative view of how ASA filament and PLA filament are typically positioned. They are not lab measurements; they’re a quick way to map thermal, UV, and detail priorities.
Heat Tolerance (Warm Environment Headroom)
UV and Weather Exposure (Sunlight-Friendly)
Fine Detail Feel (Edges, Surface, Small Features)
Datasheet Fields That Matter Most
When you compare two spools of ASA or PLA, these are the fields that usually carry the most decision weight. They connect directly to heat response, stiffness, and outdoor behavior.
- Glass transition (Tg) and HDT for real heat behavior.
- Nozzle and bed temperature ranges for profile compatibility.
- Tensile modulus for how “stiff” the part feels in hand.
- Yield strength values (and whether they’re measured on printed samples).
- Moisture absorption notes for long storage stability.
- Test standard labels (ISO / ASTM) so you know you’re comparing like-for-like.
