Plastic is one of the most versatile materials used in modern manufacturing. From protective machine guards and electrical enclosures to medical components, retail displays and precision engineering parts, fabricated plastics can be found across almost every industry.
But what exactly is plastic fabrication, and how are sheets, rods and blocks of plastic transformed into accurate, finished components?
In this guide, we explain the main plastic fabrication processes, including laser cutting, CNC machining and vacuum forming, as well as the materials commonly used and the applications they are best suited to.
What Is Plastic Fabrication?
Plastic fabrication is the process of cutting, shaping, forming, machining, joining and finishing plastic materials to create a finished component or product.
Rather than relying on one manufacturing technique, plastic fabrication can involve several different processes depending on the material, design, tolerances, quantity and intended application.
Raw materials such as plastic sheet, rod or block can be transformed into anything from a simple protective panel to a complex precision component.
One of the major advantages of plastic fabrication is flexibility. Components can be manufactured as individual prototypes or in low and medium volume production runs without necessarily requiring the significant tooling investment associated with processes such as injection moulding.
What Are the Main Plastic Fabrication Processes?
There are numerous ways to fabricate plastic. Choosing the right method depends on the component being manufactured, its dimensions, material and required finish.
Some of the most commonly used processes include the following.
Laser Cutting
Laser cutting is a non-contact manufacturing process that uses a focused laser beam to cut through plastic sheet.
The cutting path is controlled digitally, allowing complex shapes and detailed designs to be reproduced accurately and consistently.
One of the biggest advantages of laser cutting is the quality of the finished edge. Materials such as acrylic can achieve a smooth, polished-looking edge directly from the cutting process, reducing the amount of additional finishing required.
Laser cutting is particularly useful for producing components such as:
- Signage
- Display panels
- Covers and guards
- Decorative components
- Acrylic components
- Thin plastic parts
- Prototypes
However, not every plastic responds to laser cutting in the same way. Material compatibility, thickness and the required finish should therefore be considered before selecting this process.
CNC Machining
CNC machining is another important part of modern plastic fabrication.
CNC stands for Computer Numerical Control. Rather than manually cutting a component, computer-controlled machinery follows programmed instructions to remove material from a plastic sheet, rod or block.
Several CNC processes can be used when working with plastics.
CNC Routing
CNC routing is particularly effective for machining plastic sheets. A rotating cutting tool follows a programmed path to produce accurate profiles, holes and other features.
It is commonly used for larger components such as machine guards, panels, windows and enclosures.
CNC Milling
CNC milling can manufacture more complex components requiring multiple features, different depths or tight tolerances.
Modern multi-axis CNC machines allow a component to be machined from several angles, making it possible to manufacture sophisticated parts that would be difficult to produce manually.
The repeatability of CNC machining also makes it suitable when multiple identical components are required.
Vacuum Forming
Vacuum forming takes a different approach to cutting and machining.
Instead of removing material, the process involves heating a thermoplastic sheet until it becomes soft and pliable. The sheet is then positioned over a mould, and a vacuum draws the plastic tightly around its shape.
Once cooled, the plastic retains the shape of the mould and can be trimmed and finished to create the final component.
Vacuum forming can be particularly cost effective for prototypes and low to medium production volumes because tooling can be simpler and less expensive than processes such as injection moulding.
Common vacuum formed products include:
- Protective covers
- Machine housings
- Packaging trays
- Point of sale displays
- Vehicle components
- Medical trays
- Equipment enclosures
- Consumer products
It can also be used to manufacture relatively large components while maintaining a consistent shape and surface finish.
Choosing the Right Plastic Material
Selecting the fabrication process is only part of the equation. Choosing the correct plastic material is equally important.
Different plastics offer significantly different characteristics in terms of impact resistance, chemical resistance, temperature performance, appearance, weight and machinability.
Acrylic
Acrylic, also known as PMMA, is widely used when appearance and optical clarity are important.
It can provide a glass-like appearance while being lighter than glass and is commonly used for displays, signage, screens and other visually important components.
Acrylic is also particularly well suited to laser cutting.
Polycarbonate
Polycarbonate is known for its excellent impact resistance and durability.
It is commonly selected for protective applications such as machine guards, safety screens and industrial components where strength is more important than simply achieving a decorative finish.
ABS
ABS offers a useful combination of strength, impact resistance and good surface quality.
It can be fabricated and vacuum formed effectively, making it popular for housings, covers, automotive components and various industrial applications.
PETG
PETG combines good clarity with impact resistance and formability.
Applications can include displays, protective covers, packaging and medical components. Its ability to be formed also makes it useful for vacuum forming applications.
Engineering Plastics
More specialised applications may require engineering plastics offering particular mechanical, chemical or thermal properties.
Materials such as nylon, acetal, PTFE, PEEK, polyethylene and other specialist polymers may be selected according to the operating environment and performance requirements of the finished component.
Why Is Material Selection Important?
Choosing a plastic based solely on price can lead to problems later.
A component used outdoors, for example, may require UV resistance, while a component used within food processing machinery may need to meet specific hygiene or food-contact requirements.
Other factors to consider include:
- Operating temperature
- Chemical exposure
- Impact resistance
- Required tolerances
- Flexibility or rigidity
- Electrical properties
- Appearance and transparency
- Outdoor exposure
- Regulatory requirements
- Expected service life
Working with an experienced plastic fabrication company can help ensure the material and manufacturing process are considered together rather than independently.
What Industries Use Plastic Fabrication?
Plastic fabrication is used across an extremely diverse range of industries because components can be manufactured to highly specific requirements.
In aerospace and defence, precision polymer components may be required for specialist equipment and systems.
Food and beverage manufacturers use fabricated plastics for items such as guides, guards and conveyor components, where appropriate material selection is particularly important.
Agriculture and horticulture applications can require robust components capable of dealing with chemicals, moisture and demanding outdoor environments.
Plastic fabrication is also widely used within automation, electronics, pharmaceutical machinery, medical and healthcare equipment, retail, consumer goods and general manufacturing.
The ability to manufacture bespoke components makes fabrication particularly valuable when an off-the-shelf plastic part simply isn’t suitable.
What Are the Benefits of Plastic Fabrication?
Modern plastic fabrication provides manufacturers and product designers with considerable flexibility.
Components can be created specifically for an application rather than adapting a standard product. CNC and laser technology also allow designs to be reproduced accurately, making it easier to maintain consistency across a production run.
Fabrication can also be an attractive option for prototypes and lower production volumes because many processes do not require expensive dedicated mould tooling.
Combining different processes under one project can provide even greater flexibility. A component might, for example, be CNC machined before undergoing additional forming, assembly or finishing.
Frequently Asked Questions About Plastic Fabrication
What does a plastic fabricator do?
A plastic fabricator transforms raw plastic materials into finished components using processes such as cutting, CNC machining, forming, welding, bonding and finishing.
What plastics can be fabricated?
Many different plastics can be fabricated, including acrylic, polycarbonate, ABS, PETG, PVC, polyethylene, nylon, acetal, PTFE and various specialist engineering polymers. The best option depends on the application.
Is CNC machining suitable for plastic?
Yes. CNC machining can produce highly accurate and repeatable plastic components and is particularly useful for parts with complex geometries or tight dimensional requirements.
What is the difference between plastic fabrication and injection moulding?
Plastic fabrication generally involves cutting, machining, forming or assembling existing plastic sheet, rod or block. Injection moulding melts plastic material and injects it into a dedicated mould. Fabrication can therefore be particularly suitable for prototypes, bespoke components and lower production volumes.
How do I choose the right plastic fabrication process?
The best process depends on factors including component geometry, material, tolerances, production quantity, finish and operating environment. In many cases, more than one fabrication method may be used to produce the finished component.
Find the Right Plastic Fabrication Solution
From straightforward cut plastic panels to complex CNC machined components and vacuum formed products, modern plastic fabrication services can provide highly flexible solutions for a wide range of manufacturing requirements.
The key is choosing the right combination of material and manufacturing process. By considering strength, appearance, environmental conditions, tolerances and production volumes from the beginning, manufacturers can create plastic components that are efficient to produce and designed to perform reliably in their intended application.