# ASA

Acrylonitrile Styrene Acrylate (ASA) has emerged as a superior alternative to ABS in 3D printing, combining durability with exceptional resistance to weathering. Known for its ability to withstand UV exposure, heat, and harsh environments, ASA is the go-to filament for functional parts that thrive outdoors. From automotive components to garden fixtures, ASA bridges the gap between industrial-grade performance and practical printability.

<figure><img src="/files/OCTB62hF8Kh1WKjnKL2e" alt=""><figcaption><p>Polymaker's ASA makes for great outdoor applications</p></figcaption></figure>

### **What Is ASA?**

ASA is a thermoplastic polymer engineered to excel in outdoor and high-stress environments. Its composition - acrylonitrile for chemical resistance, styrene for rigidity, and acrylate for UV stability - makes it a robust alternative to ABS. Unlike ABS, ASA retains its color and mechanical properties even after prolonged sun exposure, thanks to its UV-resistant acrylic ester elastomer.

### **Printing with ASA: Precision and Preparation**

ASA demands careful calibration to balance adhesion, warping, and layer bonding. Here’s how to optimize your prints:

### **Key Settings**

* **Nozzle Temperature**: 240–280°C (start at 250°C and adjust based on filament brand).
* **Bed Temperature**: 90–110°C (heated bed essential for adhesion).
* **Print Speed**: 35–70 mm/s (slower speeds improve layer bonding).
* **Ambient Temperature**: Maintain a draft-free, warm environment or use an enclosed printer (60°C chamber ideal).&#x20;

### **Adhesion and Warping**

* **Build Plate**: Use PEI sheets, BuildTak, or adhesion items such as Magigoo Original for reliable first-layer grip.
* **Enclosure (or warm ambient air)**: Critical for minimizing warping and cracking, especially in large prints.
* **Cooling**: Reduce or disable part cooling fans to prevent rapid cooling and warping.

### **Challenges**

* **Fumes**: ASA emits VOCs during printing; ensure proper ventilation or air filtration.
* **Moisture Sensitivity**: Store filament in a dry, sealed container to prevent moisture absorption.
* **Stringing**: Fine-tune retraction (1–2 mm at 20–30 mm/s) to minimize oozing.

### **Advantages of ASA**

1. **UV Resistance**: Retains color and strength under prolonged sun exposure, ideal for outdoor signs, automotive trim, and patio fixtures.
2. **Thermal Stability**: Heat deflection temperature of 86–96°C (1.8 MPa) outperforms PLA and rivals ABS.
3. **Mechanical Strength**: Tensile strength of 47.1 MPa and impact resistance of 180 J/m (notched) ensure durability in high-stress applications.
4. **Chemical Resistance**: Withstands oils, acids, and alkalis, suitable for industrial or automotive parts.
5. **Post-Processing**: Smoothable with acetone vapor for a polished finish, though should be taken with extreme caution due to the flammability of acetone.

### **Limitations of ASA**

1. **Print Complexity**: Requires warm ambient air, heated bed, and precise temperature control.
2. **Fume Management**: Strong odor during printing necessitates ventilation.
3. **Not Food-Safe**: Unsuitable for kitchenware or medical applications.
4. **Material Sensitivity**: Prone to warping if printed in humid or drafty environments.

### **ASA vs. ABS: A Practical Comparison**

| Property             | ASA               | ABS               |
| -------------------- | ----------------- | ----------------- |
| **UV Resistance**    | Excellent         | Poor              |
| **Heat Resistance**  | 86–96°C (HDT)     | 100–110°C (HDT)   |
| **Impact Strength**  | 180 J/m (Notched) | 200 J/m (Notched) |
| **Print Difficulty** | Moderate          | Challenging       |
| **Outdoor Use**      | Ideal             | Not Recommended   |

### **Applications of ASA**

* **Automotive**: Exterior trim, mirror housings, and under-hood components.
* **Outdoor Fixtures**: Garden tools, patio furniture, and UV-resistant signage.
* **Industrial**: Jigs, enclosures, and chemical-resistant parts.
* **Consumer Goods**: Durable phone cases, outdoor toys, and sporting equipment.

### Requirements to Print ASA

* Enclosure or warm ambient air
* Not needed, but all-metal hotend is recommended if attempting to print above 240°C


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://wiki.polymaker.com/the-basics/3d-printing-materials/asa.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.