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Designer inserting a thermoforming template inside the Mayku Multiplier (pressure forming machine)
Close up image of a thermoforming template made with an SLS 3D Printer (Formlabs Fuse 1)

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Comparison: Vacuum Forming vs Pressure Forming

Close up of the Mayku Multiplier - a desktop pressure forming machine - with a template in the forming area

Previously, we have examined thermoforming technology as a whole, as well as vacuum forming and pressure forming as individual processes. Now, we’ll put the two side by side, comparing how the technologies work, common materials, benefits, and much more.

Vacuum forming is the oldest method of thermoforming, and refers to the use of a vacuum to remove the air between heated plastic material and a template. The subsequent vacuum causes the plastic material to fully conform to a template, capturing details, shape, and other features.

First, a plastic material, typically in the form of a sheet or a roll, is loaded onto the vacuum machine’s material carrier, where it is heated from above. 

Once sufficiently softened, the vacuum-forming tool is pulled closer to the template, creating a seal. After this, a vacuum pump creates a vacuum, drawing the sheet over the template in the vacuum-forming tool.

The resultant plastic cools and sets, then is removed by hand or with the use of air. If necessary, it can then be trimmed or otherwise modified to meet certain specifications.

Graphic: what is vacuum forming

Pressure forming refers to the process of using air pressure on a heated plastic sheet to create a mold or part. It is able to create parts or tools that exhibit high degrees of details and texture.

First, a plastic sheet is inserted into a pressure-forming machine so that it sits over a template. It is then heated from above. Once the proper temperature is reached, pressurized air pushes the plastic sheet over the template. An air vent removes any access air. Once sufficiently cooled and hardened, the plastic – now a mold – is removed from the template to be used as is or to be further processed.

Graphic: what is pressure forming

Vacuum forming and pressure forming are compatible with the same materials, although pressure forming is usually capable of using thicker plastic sheets than vacuum forming – resulting in thicker end parts. 

  • High-impact polystyrene (HIPS) – stable, low cost, and impact resistant
  • EVA  – featuring low-temperature toughness and UV resistance
  • PETG – good hardness, chemical resistance, impact resistance, transparency and ductility, making it suitable for food-grade tools or parts
  • Low-density polyethylene (LDPE) – can withstand high temperatures, is chemical resistant, soft, and flexible

Other materials used for pressure forming and vacuum forming include:

  • Acrylic (PMMA)
  • Acrylonitrile butadiene styrene (ABS)
  • Polycarbonate (PC)
  • Polyethylene (PE)
  • Polypropylene (PP)
  • Polystyrene (PS)
  • Polyvinyl chloride (PVC)
  • And many more

Vacuum forming templates

In vacuum forming, male templates are more common, as the materials used are typically thinner, and the level of detail expected on applications such as packaging is not as high.

Pressure forming templates

In pressure forming, female templates are most common, as molds or parts with high levels of detail, texture or other exterior aesthetics are often created using the process. 

Graphic: difference between a male mold and female mold in thermoforming

For more on the differences between vacuum forming and pressure forming, you can read our articles on the basics of vacuum forming and pressure forming.

Benefits of vacuum forming

Benefits of pressure forming

  • Affordability. For small production runs, vacuum forming is often less costly than processes such as injection molding. This is because vacuum forming tools are easy and affordable to purchase.  
  • Speed. The vacuum forming process – including design, template manufacturing, and prototyping – is often faster than manufacturing methods, such as injection molding.
  • Flexibility. As it is cheaper and faster, vacuum forming providers manufacturers and designers with the ability to test and iterate with prototypes.
  • Consistency. Because vacuum forming creates objects with a mold, there is very little variation between individual parts.
    Toughness and durability. While toughness and durability will of course vary depending on the material used, plastic is generally known for its ability to last.
  • Food-safe materials. Because it can be used with plastics that are able to b
    sterilized, vacuum forming is a viable candidate for the creation of food-safe containers.
  • Aesthetics. The exteriors of pressure-formed parts or molds are nearly identical to those created with injection molding, meaning applications with textures, lettering, branding, text, or fine details work well with pressure forming process. 
  • Part tolerances. Using a female template results in parts that adhere exactly to its dimensions – and exhibit excellent tolerances – making pressure-formed parts a good choice for assemblies. 
  • Affordability. Pressure forming rivals injection molding in terms of final product, but can often be achieved more cheaply, thanks to pressure forming’s lower tooling cost.
  • Speed. The pressure forming process – including design, template manufacturing, and prototyping – is often faster than injection molding or other manufacturing processes.
  • Cost-efficacy. In addition to a relatively low tooling cost, pressure forming is a good choice for creating small- to medium-batch runs of products.

Mayku FormBox: Desktop vacuum 3D forming machine

The Mayku FormBox is a compact, vacuum-powered 3D former – and is part of Mayku’s 3D former family. A 3D former is powered by technologies such as thermoforming, and is as easy to use as a desktop 3D printer.

The Mayku FormBox is compatible with multiple materials, including those which are flexible and resin-resistant. It uses a 1000W ceramic heater to heat a plastic forming sheet that can be molded onto a template object. Once the sheet has been heated and lowered onto the template, suction forces the heated sheet into every detail of your part, tool, or object.

Mayku Multiplier: Desktop pressure forming machine

The Mayku Multiplier is a desktop 3D former powered by industrial pressure forming technology. It’s compatible with multiple plastic types and thicknesses, and results in highly detailed final parts and molds. When filled with compressed air, the Multiplier’s dome is pressurized to four atmospheres. This pressure forces air onto a heated plastic sheet into every crevice of a mold, and is able to capture details of less than <1μm with materials such as EVA sheets.

Want to learn more about thermoforming? There is a wealth of resources on the subject on our blog. Have questions? You can also schedule a call with a Mayku specialist to make sure you’re on the right track. You can also get to know Mayku 3D formers on our product pages.

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