Maya Ellison
Vacuum forming is a simplified version of thermoforming, where a sheet of plastic is heated to a forming temperature, stretched onto a single-surface mould, and forced against the mould by a vacuum. The most common and easiest thermoplastic to use for vacuum forming is high-impact polystyrene sheeting (HIPS), which is known for its high impact strength, ease of processing, and versatility. Other plastics that are easy to vacuum form include PETG, PVC, ABS, acrylic, APET, and polycarbonate (PC).
| Characteristics | Values |
|---|---|
| Easiest plastic to vacuum form | HIPS (High-Impact Polystyrene Sheeting), PETG, ABS, Acrylic, APET, PVC, HDPE, Polycarbonate (PC), Acrylonitrile Styrene Acrylate (ASA) |
| Ideal for | Low-impact products, protective packaging, toys, medical-grade equipment, chocolate moulds, clear finish, deep draws, complex die cuts, intricate packaging trays, construction, healthcare, automotive sectors, outdoor applications |
| Essential attributes | Low forming temperatures, high thermal and impact strength, good flow, minimal shrinkage during cooling, ease of fabrication, impact resistance, chemical resistance, UV protection |
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What You'll Learn
HIPS (High-Impact Polystyrene Sheeting)
HIPS offers excellent dimensional stability, which means it can be used to create precise models and prototypes. It is also non-toxic and odorless, making it safe for a wide range of applications. This plastic can be easily cut, drilled, machined, bent, bonded, painted, and glued. It is available in various colors and finishes, including matte and gloss, and can be customized to specific dimensions and thicknesses.
The superior impact resistance of HIPS makes it suitable for applications such as food containers, rubber tires, building insulation, and reinforced fiberglass composites like boat hulls and surfboards. It is also FDA-compliant, making it suitable for food processing and medical applications. However, it may not be the best choice for long-term outdoor use due to its limited UV protection.
When using HIPS for vacuum forming, it is important to consider the finishing and machining processes. HIPS requires a special etch primer before spraying. However, it offers great machining capabilities with all methods and can be easily assembled using mechanical fasteners, adhesives, or solvents.
Overall, HIPS (High-Impact Polystyrene Sheeting) is a cost-effective, versatile, and durable plastic material that is well-suited for vacuum forming projects, especially those requiring impact resistance, stiffness, and ease of fabrication.
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PETG
One of the benefits of using PETG is that it is less prone to cracking than acrylic. It is also easy to work with, cutting and heating evenly and staying clear during the vacuum forming process.
However, it is important to note that PETG may require drying before use to prevent bubbles or imperfections. Some users have reported issues with "dots" or "stars" or clouding when using clear PETG, which can be due to overheating or moisture absorption during storage. To avoid these issues, it is recommended to dry the PETG in a warm cabinet or oven before forming, and to ensure that your equipment is also warm and dry.
Overall, PETG is a versatile and user-friendly option for vacuum forming, offering a range of applications and good formability.
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ABS
The process of ABS vacuum forming involves heating the plastic sheet to a pliable temperature and then placing it over a mold. Vacuum and additional air pressure are applied to shape the sheet into detailed molds, allowing for more intricate part designs. Once the sheet conforms to the mold, it is cooled to solidify the final shape, and any excess material is trimmed away.
Overall, ABS is a highly suitable material for vacuum forming due to its impact resistance, heat stability, and ease of processing. It is a cost-effective and versatile option for creating durable and resilient products across a wide range of industries.
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PVC
Polyvinyl Chloride (PVC) is a versatile plastic that can be used in vacuum forming. Its strength, stiffness, and ease of fabrication make it a good choice for a wide range of applications, from construction to healthcare and automotive sectors.
In addition to construction materials, PVC is used in vinyl siding, window frames, and roof lining. It is also used in blister packaging, providing excellent impact and chemical resistance.
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Acrylic
One potential disadvantage of using acrylic for vacuum forming is its relatively high melting point, which may require longer heating times and higher temperatures. Additionally, acrylic is more expensive than some other types of plastic, such as polystyrene or PETG. However, it is still a cost-effective option compared to polycarbonate and is available in many colours.
When creating a vacuum-forming tool, it is important to consider the complexity and quantity of the plastic part being formed. Tools can be made from various materials, including Model Board or Aluminium. Moulds should have tapered sides to allow for easy release of the plastic part.
Overall, acrylic is a versatile and reliable material for vacuum forming, making it a popular choice for various applications, from prototypes to custom parts and large-scale production runs.
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Frequently asked questions
The easiest plastic to vacuum form is acrylonitrile styrene acrylate (ASA), which is easy to mould, trim and fabricate. It also offers excellent weather resistance, making it ideal for outdoor applications.
High-impact polystyrene sheeting (HIPS) is another incredibly flexible plastic that can be moulded into almost any shape. Polypropylene is perfect for applications requiring low friction, and PVC is a versatile choice for a wide range of applications due to its strength, stiffness and ease of fabrication.
Polycarbonate (PC) is a tough, clear plastic that is flame, chemical and water-resistant. PETG is also a good option, although it is more rubbery than styrene and requires careful handling if re-forming with a heat gun.
Some plastics, like Lexan, can have bubbles appear in them after vacuum forming if they began with moisture trapped inside. To avoid this, the plastic must be baked first to evaporate the moisture.
