Pentagon, putting the positivity in to plastics manufacture

Plastic Injection Moulding

We offer a complete injection moulding service from initial design to development and onto tooling, production and post production support. Our team are highly experienced and dedicated, offering a plastic injection moulding service that is truly world leading. We are able to offer mould tooling solutions as well as repeat production of injection moulding components.

We have a range of cutting edge tools and technology at our disposal to deliver plastic injection moulding and tooling. We work very closely with out customers to make sure we fulfil their requirements to the letter and beyond.

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UK Based Plastics Manufacturer

Pentagon Plastics are your technical experts for bespoke technical plastic injection moulding and one of the leading plastic injection moulding companies in the UK! Based in Horsham, West Sussex, (United Kingdom), the company has enjoyed in excess of 45 years of trading. As experts in our field, and experienced injection moulders, we provide a wealth of knowledge and skill to our diverse customer base. Services offered here at Pentagon Plastics include design assistance, development, toolmaking and injection moulding.

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Our Featured Services


We provide a high level of assistance at every stage of a project. This would begin on receipt of your enquiry with a Design For Manufacture (DFM) review of the component. At the earliest stage, the DFM process will focus on ease of manufacture and optimal mould tool configuration.

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When developing a component for plastic injection moulding it is essential that your product will be fit for purpose and is designed for the intended manufacturing process.  We draw on our experience and technical knowledge to support you at this early stage.

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Moulding Division

Our ISO9001:2015 accredited moulding division is the core of our manufacturing facility and is home to a range of modern plastic injection moulding presses. Presses range from 22 tonne to 280 tonne clamp force which enables us to mould shot weights from 0.5 grams upwards.

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Tooling Division

Our ISO9001:2015 accredited tooling division provides a comprehensive UK manufacturing solution to support our customers mould tooling requirements.

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Beyond The Mould

There can be processes required that are deemed too complex or costly to have been completed during the moulding process. Therefore our plastic injection moulding process does not stop when the product is released from the tool.

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Latest news

Pentagon is proud to join the Made in Britain community
February 24, 2021
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Supply difficulties in a material world
February 24, 2021
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Looking back but still looking forward
December 2, 2020
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Download our brochure

Click the button below to download our brochure and tofind out more about Pentagon Plastics and how we can help you and your business


Interested in working with us?
Get in touch today to get started.

If you want to start a project or just have a question, we are always here to help.
Visit our work with us page for estimated tooling costs.