Compression Moulding

Our advanced thermoplastic-based compression moulding materials offer the facility for moulding complex, high-strength components, with optimised cycle times.

Behind the scenes

Once the mould is closed, pressure is applied to compress the heated thermoplastic material within the mould cavity. The combination of heat and pressure causes the thermoplastic to soften and flow, conforming to the shape of the mould. 

The compression stage ensures that the material fills all the intricacies and details of the mould, resulting in a finished part with high dimensional accuracy and consistency.

Our advanced facility allows us to mould bespoke, complex, high-strength components, whatever the application.

What is Compression Moulding?

Thermoplastic compression moulding is a manufacturing process used to shape thermoplastic materials into specific forms or parts.

It involves heating a pre-measured amount of thermoplastic material in the form of pellets, powder, or pre-cut shapes and placing it into a heated mould cavity. The mould consists of two halves that close around the plastic material.

Thermoplastic compression moulding is suitable for producing parts with moderate to complex geometries and is commonly used to manufacture items like automotive components, electrical connectors, appliance parts, and various industrial components.

Compression Moulding Wheel Arch Liner 900 900 85 s c1

Thermoplastic Compression Moulding benefits


The equipment and tooling costs for compression moulding are generally lower compared to other moulding processes like injection moulding. This makes it a cost-effective option for medium to high production volumes.


Compression moulding can be used with a wide range of thermoplastic materials, allowing for flexibility in material selection to meet specific performance and application requirements.

Complex shapes

The process is capable of producing parts with intricate and complex geometries. It can accommodate undercuts, inserts, and varying wall thicknesses in the moulded parts.

High strength and quality

Compression moulded parts exhibit excellent mechanical properties and high structural integrity due to the controlled application of pressure and heat during the moulding process.

Good dimensional accuracy

The use of precise moulds and controlled pressure ensures consistent and accurate part dimensions, resulting in parts with tight tolerances.

Short cycle times

While not as fast as some other moulding processes like injection moulding, compression moulding still offers relatively short cycle times, making it suitable for high-volume production.

Reduced waste

Compression moulding generates minimal waste since the material is pre-measured and placed directly into the mould, minimising excess material and trimmings.

Environmentally friendly

Thermoplastic compression moulding does not require the use of curing agents or other chemicals, making it a more environmentally friendly process compared to some thermosetting moulding methods.

Low residual stresses

The slow and controlled cooling process in compression moulding helps to reduce residual stresses in the finished parts, leading to improved mechanical properties.

Suitable for large parts

Compression moulding can be used to manufacture large parts that may be difficult or impractical to produce using other moulding techniques.

Get in touch

At Linecross we provide a complete ‘concept to production’ service from customised product development to assembly and sequenced supply. Find out more about how our range of processes can support your business.

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