Pentagon, putting the positivity in to plastics manufacture

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Leading Plastic Injection Moulding Services

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 and thermoplastic moulding.

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


Design For Manufacture or DFM will focus on ease of manufacture and optimal mould tool configuration.
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We draw on our experience and technical knowledge to support you at this early stage.
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Moulding Division

Our ISO 9001:2015 accredited moulding division is the core of our manufacturing facility and capabilities.
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Tooling Division

We provide manufacturing support our customers mould tooling requirements including mould tool design.
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UK Plastics Manufacturer and Tooling Division

We operate two companies from our UK site, Pentagon Plastics Ltd and Pentagon Tooling Ltd and have traded in the sector since 1972.  The companies complement each other operating as two supporting divisions in the plastics industry specifically in the sectors of plastic injection moulding and tool manufacture.


The tooling division provides extensive tooling skills to our diverse customer base spanning a wide range of industry sectors and specialises in all forms of mould tool services.  This delivers comprehensive mould tool manufacture and support for bespoke in-house moulding for a range of customers and an outsourced service to other plastic injection moulders. Pentagon Tooling is a centre of excellence for mould tool servicing, repair, modification, pre-production development and production mould tools including complex multi-cavity tooling for industries such as medical, aviation, caps & closure and packaging markets amongst others.


The plastics division is a technical expert providing a wealth of knowledge and experience to a diverse customer base spanning many industries. Our services include design for manufacture, development, tool trials, low to medium volume repeat production and post moulding operations. A wide range of injection mould tooling can be accommodated including basic development tools, single impression and family moulds through to multi-cavity. Tools are processed on a range of clean, efficient and well maintained electric, hybrid and hydraulic moulding machines.

Post Moulding

The post moulding services provide added value to the customers and include finishing of parts, inserting, waxing and light assembly. Specialist services such as painting, coating and marking are subcontracted to approved suppliers.

Plastic Injection Moulding Manufacturer

If you want to start a project or just have a question, we are always here to help.

What is Plastic Injection Moulding?

Plastic injection moulding is the process of taking thermoplastic granules and reforming them to a specific shape to produce a component that is functional to meet a specific application. Two main pieces of equipment are required, these are an injection moulding machine and a mould tool.

The thermoplastic granules are loaded into a feeding hopper to be heated into a molten form and then injected into the temperature-controlled mould tool to set the plastic to the required shape.

This simplifies plastic injection moulding as there are many technical process controls including the type of thermoplastic to suit the application, the size of press required and the configuration of the mould tool to be considered.

At Pentagon we have successfully manufactured many hundreds of parts including non-invasive medical, aircraft seating components and electrical housings but our services align themselves to support most industry requirements.

Everything In-House

The level of service provided from the facilities in Horsham, West Sussex stand the business apart from many of its competitors in the UK as we do not outsource the mould tooling and therefore have direct on-site control over every element of a project.

Why Choose Pentagon

  • ISO 9001:2015 accredited for tooling and moulding.
  • UK designed and manufactured tooling.
  • Design for manufacture support.
  • One site of manufacture for both Tooling and Production.
  • Full tool preventative maintenance and service program.
  • Experienced in processing commodity through to high end engineering thermoplastics.
  • Full 360˚process control at each stage of manufacture.
  • Full process traceability.
  • Production fully optimised.
  • 24-hour production capacity.
  • Mould Tool and Production trials
  • Post moulding added value services.
  • Supply options to meet customer requirements.
  • Managed investment program.

Nearly 50 Years Experience in the Plastics Industry!

We have been trading in the industry since 1972 and under the Pentagon Name since 1979. Our years of experience mean we understand all the challenges, methods and have the know how to take on any project. While we have years of experience to look back on we also keep our team up to date on the latest tools and manufacturing methods.

Sectors We Work In

We have worked on projects across a vast array of sectors over the years and our experience allows us to take on projects in new sectors with ease.

Here are just a few common sectors we work in:

- Medical non-invasive products

- Medical devices

- Aviation and aerospace

- Security, sensor and control

- Construction and electrical

Tooling Capabilities

  • Fully equipped tooling facility
  • ISO 9001:2015 accredited quality control process
  • Experienced tooling staff
  • EDM, CNC and manual machines
  • Laser welding
  • CMM Inspection
  • Development and production mould tools
  • Service, repair and modification service
  • Tool preventative maintenance program
  • Single, family and multi-cavity tools
  • Up to 2 tonne weight

Tooling Lead Times


3-6 Weeks from date of order

Basic Production

6-10 Weeks from date of order

Complex Production

8-12 Weeks from date of order


10-18 Weeks from date of order

Moulding Capabilities

  • Fully equipped moulding facility
  • Experienced processing staff
  • 12 x injection moulding machines
  • Moulding range from 22 tonne to 280 tonne
  • Shot weights from 0.5 grams to 500 grams.
  • Supporting ancillary equipment
  • On-site material stores
  • Development and production service
  • Production optimisation program
  • ISO 9001:2015 accredited quality control process
  • Process Control – first off, patrol and final release
  • Material and Production Trials
  • Post moulding and packing services

Moulding Lead Times

Production Orders

3-6 Weeks from date of order

Production Batch Volumes

Low 1- 2,000

Medium 2,000– 20,000

High 20,000– 250,000

Download Our Brochure

Click the button below to download our brochure and to find 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 about our plastic injection moulding services; we are always here to help.
Visit our work with us page for estimated tooling costs.