
ABS plastic has a relatively low melting point, making it easy to melt and shape. However, it is important to take precautions to avoid burning or decomposing the plastic. To melt ABS plastic, you can use an oven, but this should be done in a well-ventilated area or outdoors. Boiling water is another safe method to melt ABS plastic as it prevents the plastic from exceeding 212 degrees Fahrenheit, the temperature at which water boils. Additionally, acetone can be used to create ABS glue, which melts and fuses two pieces of ABS plastic together, forming a strong bond.
| Characteristics | Values |
|---|---|
| Melting Method | Boiling water, oven, acetone |
| Ventilation | Well-ventilated area |
| Protective Gear | Long-sleeved cotton shirts, gloves, eye protection |
| Acetone Application | Applied directly to ABS parts, mixed with ABS to create ABS glue |
| ABS Glue | Fuses pieces together into one strong piece |
| ABS Slurry | Used to fill in gaps between glued pieces |
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What You'll Learn

Use boiling water to melt ABS plastic
ABS, or Acrylonitrile Butadiene Styrene, is a type of plastic that is highly resistant to corrosive chemicals or physical damage. It is commonly used in automotive trim pieces because it is strong, inexpensive, and can be easily moulded into virtually any shape. It has a relatively low melting point of 221 degrees Fahrenheit (105 degrees Celsius).
Using boiling water is an effective and safe method to melt and reshape ABS plastic. Water boils at 212 degrees Fahrenheit, which is 9 degrees below the melting point of ABS. This means that when ABS is submerged in boiling water, it becomes soft and rubbery, but will not burn or decompose. This method is preferred over heating ABS over an open flame or another direct heat source, which risks overheating the plastic and causing it to decompose, releasing carcinogenic chemicals.
When using boiling water to melt ABS plastic, it is important to work in a well-ventilated area to avoid inhaling any fumes. It is also crucial to wear appropriate personal protective equipment, such as long-sleeved cotton shirts, gloves, and eye and/or face protection.
To melt ABS plastic using boiling water, simply bring a pot of water to a boil and submerge the ABS plastic into the water. The ABS will become soft and mouldable, allowing you to shape it as desired. Once the ABS has cooled, it will hold its new shape. If the ABS becomes too soft or you need to make further adjustments, you can dip it into a bath of cool water to quickly lower its temperature and then repeat the process as needed.
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Use ABS glue to weld pieces together
ABS glue is a great option for welding two ABS parts together. It melts the two pieces, fusing them into one strong piece, instead of two glued pieces. This is a better option than using other adhesives, including super glue.
To make your own ABS glue, you will need a metal, glass, PP plastic, or HDPE plastic container. You can identify PP or HDPE by looking at the recycling symbol on the bottom. Pour 50ml of acetone into your container. Measure out 100cm of 2.85mm ABS filament or 8g of ABS scrap. The colour of your mixture will be the same as the material you put in, so natural ABS is a good choice if you don't want to alter the colour. Snip the filament into small pieces to increase the surface area exposed to the acetone, allowing it to dissolve more quickly. Drop the ABS into the acetone and mix it with a stick. Alternatively, you can close the lid and occasionally loosen it to release the fumes.
You can also buy commercial ABS glue, which is typically black in colour. Be sure to only apply ABS glue to kapton tape on glass or directly onto the glass. Do not apply it to a plastic print bed.
When using any glue, avoid spilling it on areas that are not being glued, as it may leave blemishes. ABS can also be "thermally bonded" using spin welding, friction welding, heat welding, or ultrasonic welding.
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Make ABS slurry to fill in gaps
ABS slurry is a mixture of ABS and acetone that can be used to fill in gaps between glued ABS parts. It can also be used to add material to areas that need to be built up. Here is a step-by-step guide to making and using ABS slurry:
First, ensure you are working in a well-ventilated area and are wearing appropriate personal protective equipment, such as long-sleeved cotton shirts, gloves, and eye protection. Then, pour 50ml of acetone into a metal, glass, PP plastic, or HDPE plastic container. You can identify the type of plastic by looking at the recycling symbol on the bottom of the container. Be sure to use a container that acetone will not dissolve.
Next, measure out 250cm of 2.85mm ABS filament or 20g of ABS scrap. The colour of the ABS will determine the colour of the slurry. If you are using filament, cut it into small pieces to increase the surface area exposed to the acetone, allowing it to dissolve more quickly. If you are using ABS scrap, chop it into very small pieces.
Add the ABS pieces to the acetone in the container. You can mix it with a stick or by closing the lid and occasionally loosening it to release the fumes. The amount of ABS you add will determine the consistency of the mixture. For ABS slurry, you want a consistency similar to pancake batter. It may take some time for the ABS to fully dissolve, so be patient.
Once your ABS slurry is ready, you can use it to fill in any gaps or seams between glued ABS pieces. It can be applied with a brush or a spatula, depending on the application. Remember to only use ABS slurry on ABS parts, as acetone will not work on other plastics like PLA.
Additionally, you can create ABS glue by mixing smaller amounts of ABS with acetone. ABS glue is excellent for welding two ABS parts together, creating a strong bond between them. With even smaller amounts of ABS, you can make ABS juice, which is useful for getting ABS prints to stick to your print surface.
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Use pure acetone to brush over ABS parts
Acetone is a highly flammable and volatile solvent that can be used to smooth the surface of 3D-printed ABS parts, removing imperfections like layer lines and leaving a smooth finish. It is important to note that acetone is hazardous and should be handled with caution. It should be stored in a cool, well-ventilated area, away from direct sunlight and heat sources.
To use pure acetone to brush over ABS parts, start by placing a small amount of liquid acetone into a shallow container. The size of the paintbrush you use will depend on the area you want to smooth. For small features, opt for a fine-tipped brush, and for larger, flat areas, use a flat brush. Dip the brush into the acetone solution and apply a thin coat to the surface of the ABS part. You can continue applying acetone until you are satisfied with the level of smoothness.
It is important to note that acetone may negatively affect the horizontal strength of the ABS part. Therefore, if enhanced horizontal strength is required, it is advisable to avoid acetone smoothing. Additionally, acetone vapor baths are another popular method for smoothing ABS parts, but they require a well-ventilated area due to the substantial amount of acetone vapor produced.
Overall, when using pure acetone to brush over ABS parts, it is crucial to prioritize safety and work in a well-ventilated area to avoid the hazardous effects of acetone exposure.
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Avoid using super glue
When it comes to melting ABS plastic together, there are a few methods to consider. One popular method is to use ABS glue, which is specifically designed for welding two ABS parts together and creates a stronger bond than other adhesives, including super glue.
While super glue is a well-known adhesive that can work on a variety of materials, including plastic, there are a few reasons why you may want to avoid using it to glue ABS plastic together.
Firstly, super glue tends to dry out quickly once the bottle is opened, which can be inconvenient if you need to use it for multiple projects or repairs. Additionally, super glue may not always provide a reliable bond with ABS plastic, and you may find that other adhesives, like ABS glue, create a stronger and more durable hold.
Another reason to avoid using super glue is that it may not be suitable for all types of plastic. Different plastics have unique chemical compositions, and some types of plastic are specifically designed to avoid being combined with other plastics. Therefore, using a universal adhesive like super glue may not always be effective or create a lasting bond.
Furthermore, super glue may not be the best choice for ABS plastic due to its strength and rapid bonding properties. While a strong and quick bond may be desirable in some cases, it can also make it difficult to adjust or reposition the glued pieces once applied. With ABS glue, you have more control over the bonding process, as it allows you to melt and fuse the pieces together gradually, resulting in a stronger and more seamless joint.
Lastly, when working with ABS plastic, it's important to consider the application method of the adhesive. Super glue typically comes in small bottles with precision applicators, which may not be suitable for larger projects or uneven surfaces. ABS glue, on the other hand, can be applied in various ways, including brushing, dipping, or using it as a filler putty to fill in gaps and create a smooth finish.
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