Vacuum forming is a thermoforming process in which a heated plastic sheet is draped over a mould and a vacuum draws the air out from beneath it, pulling the softened sheet tightly against the mould surface to capture its shape. For custom awards it is the go to method for lightweight shells, transparent covers and contoured elements at low tooling cost and quick turnaround.
Vacuum forming is the most accessible member of the thermoforming family, and in our Antwerp studio it earns a steady place for exactly that reason. When a design needs a large, light, smoothly curved surface without the expense of a steel mould, vacuum forming answers quickly and economically. As with every process we hold in house, the craft is in knowing precisely when to reach for it.
How Vacuum Forming Works
A sheet of thermoplastic is clamped in a frame and heated until it softens and sags slightly. A mould rises into the sheet, or the sheet lowers onto the mould, and a vacuum is applied through small holes in the tool. Atmospheric pressure above pushes the pliable sheet down against every contour of the mould as the air below is evacuated. The plastic cools, holds the shape, and is then trimmed to its finished outline.
Because only atmospheric pressure does the forming, the tooling can be relatively simple and inexpensive. Moulds can be made from resin, machined composite or even printed material for short runs, which keeps entry costs low and lead times short.
Vacuum Forming Within the Thermoforming Family
Vacuum forming is one specific technique under the broader thermoforming umbrella. The distinction matters when precision is discussed. Vacuum alone provides moderate forming force, which suits gentle to medium detail. Where crisper definition or deeper draws are needed, pressure forming, its higher force cousin, may be recommended instead. Understanding this hierarchy lets us choose the right level of process for each design rather than defaulting to one.
For a fuller view of the family and how the variants relate, our team can walk you through the trade offs, and our materials overview shows the sheets each variant uses.
Ideal Uses in Premium Award Design
Vacuum forming is at its best producing large, lightweight, gently curved parts. In awards this means transparent protective domes over delicate internal sculptures, sweeping contoured bases, and shell elements that give an object generous scale without heft. It is also invaluable for presentation, forming fitted inserts and covers that make the unboxing of a premium award feel deliberate and refined.
These formed parts almost always combine with other processes. A clear vacuum formed dome might protect a 3D printed and hand finished centrepiece, while a formed base carries a machined metal plate. This is the essence of our approach, layering methods so each part of the object is made the best possible way. You can see finished examples on our 3D printed trophy page.
Material Choices for Vacuum Forming
The sheet material sets the tone of the finished part.
- PETG: clear, tough and easy to form, the default for protective covers.
- Acrylic: premium optical clarity for showcase domes and lenses.
- Polycarbonate: maximum impact resistance for demanding environments.
- ABS: opaque and rigid, ready to paint or finish for structural shells.
- Styrene: economical for internal trays and packaging.
Because the material begins as a uniform sheet, colour and clarity are consistent from the outset, which is a real advantage for transparent display elements.
Strengths and Honest Limits
The strengths of vacuum forming are speed, low cost tooling, light weight and excellent large area clarity. Its limits are equally clear. Detail resolution is modest because the vacuum drapes the sheet rather than forcing it into fine features. Deep draws thin the material, so wall thickness must be planned. Only one side of the sheet is formed against the tool, so the reverse face follows the general shape but not fine detail.
We are candid about these limits. When a concept needs both a large formed surface and sharp detail, we split the work, forming the shell and adding crisp features through machining, printing or applied plates. Honest process selection protects the final quality of the award.
Cost, Volume and Turnaround
Vacuum forming suits prototypes, one offs and low to moderate production runs. Its inexpensive tooling means a design can be tried, adjusted and reformed with little penalty, which is ideal for developing a new award concept. For larger volumes with fine detail, we would compare it honestly against injection moulding, where the tooling investment starts to pay off.
Lead times are among the shortest of any forming process, which supports our 24 hour response commitment and helps clients working to event deadlines move quickly from concept to physical part.
When Fabit Recommends Vacuum Forming
We recommend vacuum forming for lightweight shells, transparent protective covers and domes, contoured bases and presentation packaging, especially in prototype and low to moderate volumes. We steer away from it when a design demands fine two sided detail or very deep draws, where other processes serve better.
Holding the full production range in house means our advice is guided only by what the object needs. Explore the breadth of finished awards on our custom trophies service page.
Frequently Asked Questions
Is vacuum forming the same as thermoforming?
Vacuum forming is one type of thermoforming. It specifically uses vacuum to shape the heated sheet, while thermoforming also includes pressure and mechanical methods.
Can vacuum formed covers be perfectly clear?
Yes. Acrylic and PETG form into optically clear domes and covers well suited to protecting a display piece.
How detailed can a vacuum formed part be?
Detail is moderate. For sharp features we add machined or printed elements after forming and combine them into the finished award.
Is it suitable for a single prototype?
Very much so. Low cost tooling makes vacuum forming one of the most economical ways to produce one off or short run formed parts.
If your award needs a light, curved or transparent element, our Antwerp studio responds within 24 hours and ships worldwide. Start your brief at our design studio and we will guide the right approach.
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