Precise and Technical Plastic Injection Moulding
Combining our technical expertise, competitive pricing, and decades of industry experience we deliver exceptional plastic injection moulding solutions to businesses Worldwide. Our advanced injection moulding facility and skilled team enable us to produce precise, high-quality parts tailored to your specifications, meeting the rigorous demands of industries from aerospace to electronics. With a commitment to efficiency and innovation, we ensure your products are manufactured with consistency, accuracy, and value - giving you the competitive edge you need in today's market.
UK Made
At our UK manufacturing facility, we operate 7 state-of-the-art, tie-bar-less plastic injection moulding machines, ranging from 50 to 480 tons. Our diverse range of injection moulding machines allow us to accommodate both large and small moulds, producing plastic parts from just a few grams to 1.5 kilograms. Several of our injection moulding machines are equipped with robotics, significantly enhancing automation, precision, and efficiency throughout our production process. These advanced capabilities enable us to deliver high-quality, consistent results across various industries and project requirements.
UK Quality
Our commitment to quality is embedded in every stage of our production process, backed by a rigorous management system. We maintain ISO 9001:2015 certification, ensuring that all procedures and products adhere to the highest standards. Our in-house CMM enables precise, real-time inspection and validation of parts, ensuring dimensional accuracy and consistency. This robust quality control infrastructure ensures that each part, from prototype to full production, meets customer specifications and industry regulations with full traceability.
We pride ourselves on offering a comprehensive, end-to-end bespoke plastic injection moulding service tailored to the unique demands of each industry we serve. We manage every aspect of the process, from initial design review, in depth DFM analysis and mould tooling through to plastic injection moulding and post-moulding services. Our in-house capabilities allow us to oversee every stage with meticulous quality control, ensuring each part meets our high standards for precision and consistency.
We operate advanced injection moulding technology that accommodates both low and high-volume injection moulding needs, with flexibility for complex and multi-cavity tools. Our expertise spans a range of industries—including automotive, medical, aerospace, and electronics—and enables us to support specialised applications with engineering-grade materials, precision injection moulding techniques, and thorough testing. Additionally, we offer secondary operations like assembly and packaging.
Full-Service Injection Moulding
At Amtek Plastics UK, we take pride in offering custom plastic injection moulding services that adapt seamlessly to our customers' needs across a variety of sectors.
With decades of experience and industry-leading expertise, we understand the unique requirements of industries such as automotive, consumer goods, electronics, and medical. Our progressive, flexible, and hands-on approach allows us to tailor and maintain solutions bespoke to each customer's specifications. This experience combined with state-of-the-art technology, ensures that every component meets both our own and our customers' rigorous standards—regardless of order size or application.
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Preparation
The plastic injection mouding process begins by confirming the correct polymer, drying the material to the specified moisture level and preparing the moulding machine for production. Temperatures, barrel zones, screw settings and clamp force are set according to the material and part requirements.
The tool is installed, aligned and checked for clean venting and consistent cooling flow.
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Processing
Once the moulding machine and tool are prepared, the molten plastic is injected into the mould under controlled speed and pressure to achieve accurate and repeatable cavity filling.
A holding phase is applied to pack the part and manage shrinkage, followed by a controlled cooling stage that allows the component to reach its required stability.
When the part has cooled, the mould opens and an ejection system removes the part cleanly.
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Quality Control
Each production run includes checks on appearance, dimensions and material performance to ensure the part meets specification. Any deviations are corrected through adjustments to the process parameters or routine tool maintenance. Data from the run is continually reviewed to ensure a stable process window is being maintained. Delivering consistent quality, reliable cycle times and long term repeatability for ongoing production.
The Injection Moulding Process
Production Capabilities
Our production capabilities are built to deliver high-quality results for any project scale, from design to full-scale, high-volume injection moulding production. Utilising advanced injection moulding machinery, we are equipped to meet technical specifications and maintain consistency across runs. Our plastic injection moulding facility is optimised for efficiency, with automation in place to streamline production and ensure on-time delivery without compromising quality. This robust setup allows us to serve diverse sectors — such as automotive, aerospace, and medical — while maintaining flexibility for unique project needs and rapid response to changing requirements.
Moulding Materials
We work with an extensive range of materials suitable for injection moulding, including high-performance engineering-grade thermoplastics. This enables us to meet the exacting standards of industries that demand specialised material properties. Leveraging our strong partnerships with global material manufacturers and distributors, we have access to the latest material innovations and ensure steady supply chains. Therefore, we can offer tailored solutions and custom plastic moulding for each application whether a client requires materials with specific strength, temperature resistance, or flexibility.
We offer eco-friendly alternatives, including the use of recycled materials, biopolymers, and plant-based plastics. These sustainable injection moulding solutions help our clients meet their own environmental goals, without compromising on the performance or quality of their products.
Secondary Operations
To add further value to our plastic injection moulding services, we offer a suite of secondary operations, including ultrasonic welding, 3D printing, inserting, full assembly, and thorough testing. These additional services enable us to deliver components and assemblies that are production-ready, saving clients time and reducing logistical complexity. Our team’s expertise in these specialised operations ensures reliable, high-quality results, whether for a single component or a complex assembly all under-one-roof. With these comprehensive capabilities, we support clients from concept through to plastic moulding and final assembly, providing a custom, streamlined, single-source solution for every stage of the manufacturing process.
Production Capabilities
Our production capabilities are built to deliver high-quality results for any project scale, from design to full-scale, high-volume production. Utilizing advanced injection molding machinery, we are equipped to meet precise specifications and maintain consistency across runs. Our facility is optimized for efficiency, with automation in place to streamline production and ensure on-time delivery without compromising quality. This robust setup allows us to serve diverse sectors — such as automotive, aerospace, and medical — while maintaining flexibility for unique project needs and rapid response to changing requirements.
Materials
We work with an extensive range of materials, including high-performance engineering-grade thermoplastics, enabling us to meet the exacting standards of industries that demand specialized properties. Leveraging our strong partnerships with global material manufacturers and distributors, we have access to the latest material innovations and ensure steady supply chains. Whether a client requires materials with specific strength, temperature resistance, or flexibility, our expertise and access enable us to offer tailored solutions for each application.
Secondary Operations
To add further value, we offer a suite of secondary operations, including ultrasonic welding, inserting, full assembly, and rigorous testing. These services enable us to deliver components and assemblies that are production-ready, saving clients time and reducing logistical complexity. Our team’s expertise in these specialized operations ensures reliable, high-quality results, whether for a single component or a complex assembly. With these comprehensive capabilities, we support clients from concept through final assembly, providing a streamlined, single-source solution for every stage of the manufacturing process.
UK Manufacturing
Our UK plastic injection moulding facility spans an impressive 18,000 sq ft, providing us with ample space to support a wide array of services. The facility is designed to house our main manufacturing area, where our state-of-the-art injection moulding machines operate 24/7.
Seamless Logistics
In addition to our production space, we have dedicated warehousing to ensure efficient storage, inventory management, and streamlined logistics for both raw materials and finished products. Our warehousing capabilities enable us to meet tight delivery schedules while maintaining an organised, efficient workflow.
Turn-Key Solutions
We also house a dedicated second operations area, where we provide value-added secondary services after plastic injection moulding. This allows us to deliver fully integrated bespoke injection moulding solutions, meeting the specific requirements of our clients with precision and reliability. The layout of our injection moulding facility maximises efficiency and flexibility, ensuring that every step of the manufacturing process, from design through to custom injection moulding and final delivery, is seamlessly managed.
Continuous Development
Meeting customer requirements on time and within budget is our highest priority. We recognise the critical need for efficiency and value in today's competitive business environment. To ensure your projects benefit from optimal performance and reliability, we continually invest in the latest, high-quality equipment and practices. This commitment allows us to leverage cutting-edge advancements in plastic injection moulding technologies, guaranteeing top-tier outcomes for your projects. In addition, we place great emphasis on investing in our team’s development. Through ongoing training and professional growth opportunities, we have cultivated a group of skilled experts who bring invaluable experience to each project. By combining state-of-the-art moulding technology with a highly trained workforce, we are able to consistently deliver exceptional custom injection moulded products with speed, precision, and efficiency every time.
"Attention to detail and commitment to quality have been integral to the success of our products. Whether it's a small batch or a large-scale order, they consistently deliver on time"
"it's critical that we work with suppliers who understand the importance of compliance and quality. Amtek has been fantastic in providing manufacturing solutions that meet stringent standards"
"We've worked with Amtek on various projects, and their ability to adapt to our changing needs is unmatched. From tooling to production, they always find the best solution. Their team is professional, responsive, and always focused on meeting our specific requirements."
"Efficient processes, combined with their knowledge and innovative approach, have helped us reduce costs without compromising on quality"
Our Moulding FAQs
The largest plastic parts we produce are approximately 1.5 metres in length. At the other end of the range, we injection mould small precision components from just a few grams.
Our press range runs from 50 to 480 tonnes of clamping force across seven plastic injection moulding machines.
Length isn't the only constraint, though. What's actually achievable on any given part is a combination of projected area, wall section, material and shot weight. A long but thin-walled part in polypropylene may run comfortably where a smaller, thick-sectioned component in a filled engineering grade would not.
The quickest route to a definitive answer is to send us your model or drawing. We'll tell you straight away whether it fits our envelope and if it genuinely doesn't, we'll say so rather than waste your time.
Yes, and it's a sector we've worked in for years, but it's worth being precise about scope, because "medical" covers a very wide range of requirements.
We manufacture and assemble plastic components for medical, healthcare and laboratory applications where cleanroom conditions are not required. Typical work includes device housings and enclosures, handling and mounting components, equipment and instrument parts, and sub-assemblies. We work with medical-grade polymers, maintain full batch traceability from raw material certificate through to despatch, validate parts dimensionally on our in-house CNC CMM, and operate under an externally audited ISO 9001:2015 quality management system.
To be clear about what we don't offer: we are not certified to ISO 13485 and we do not operate a cleanroom. If your device requires cleanroom moulding, sterile packaging or an ISO 13485-certified supply chain, we're not the right partner for that part and we'd tell you at the enquiry stage rather than three months in.
If your application sits outside those requirements, we'd very much like to hear from you. Send us your drawings and your regulatory requirements and we'll give you a straight answer about what we can do.
Three scenarios:
You already have a tool. Once it's with us, we typically need 1–2 weeks from arrival to inspect, trial, sample and get first-article approval before production starts. For a tool already stored here, we can be moulding almost immediately.
You have a production-ready design. Allow 8–10 weeks from receipt of your order and deposit through to first samples. That covers design and GA review, mould flow analysis, tool manufacture, trial and sampling. Production follows straight after your sign-off.
You're starting from a concept. Add a design for manufacture and prototyping phase first. We can have a 3D printed prototype with you in 5 working days, which typically saves far more time than it costs by catching design issues before any steel is cut.
The single biggest variable is design iteration. Customers who invest a fortnight in DFM and a printed prototype at the start almost always reach production sooner than those who rush into tooling.
Overmoulding is a two-stage process where a second material is moulded over a first. The initial component, the substrate, is produced, then placed into a second tool where another polymer is injected around or onto it, bonding the two into a single part.
The classic example is a rigid nylon or ABS handle with a soft TPE grip moulded over it. You get the structural strength of one material and the feel, seal or grip of another, in one finished component with no assembly, no adhesive and no fastener.
Common applications include soft-touch grips and handles, integrated seals and gaskets, colour or branding elements, and vibration or noise damping.
The critical factor is material compatibility. The two polymers must bond chemically or be designed to lock mechanically. Getting that wrong causes delamination in service. We'll assess it during the design for manufacture review, before the tooling is committed.
Insert moulding is where a pre-formed component, usually metal, occasionally another plastic — is placed into the tool before injection, so the plastic moulds around it and captures it permanently.
Typical inserts are threaded brass bushes, studs, pins, electrical terminals, contacts and mesh. The result is a single part with a metal feature that's far stronger than a moulded thread and won't work loose.
The advantage over post-moulding assembly is significant: fewer operations, no secondary fitting, no risk of an insert being omitted, and a stronger joint because the plastic shrinks onto the insert as it cools.
The considerations are insert placement and retention in the tool, thermal expansion differences between metal and polymer, and cycle time. Inserts usually mean a loading operation, though this can often be automated with robotics.
We also offer post-moulding heat staking and ultrasonic insertion as an alternative where that suits the design better. We'll advise which route is more economical for your volumes.
We process a wide range of commodity, engineering and high-performance thermoplastics.
Commodity grades: polypropylene (PP), polyethylene (HDPE/LDPE), polystyrene (PS/HIPS), ABS.
Engineering grades: polycarbonate (PC), PC/ABS, nylon (PA6, PA66, including glass-filled), acetal (POM), PBT, ASA.
High-performance grades: PEEK and PPS for demanding thermal, chemical and mechanical applications.
Elastomers: TPE and TPU for soft-touch and overmoulded applications.
Filled and modified grades: glass-filled, mineral-filled, flame-retardant, UV-stabilised and antistatic compounds.
Sustainable options: recycled and post-consumer grades, biopolymers and plant-based plastics.
We don't process PVC or liquid silicone rubber (LSR). If your part requires either, we'll say so up front.
If you're unsure which material suits, tell us the mechanical, thermal, chemical and regulatory demands on the part and we'll recommend options with the trade-offs explained.
We operate seven injection moulding machines ranging from 50 to 480 tonnes, running 24/7. Six are Engel tie-bar-less machines; our largest press is a 480 tonne Negri Bossi.
Tie-bar-less technology matters more than it sounds. Without tie bars obstructing the platen area, we can fit physically larger tools into smaller tonnage machines, load and unload more easily, and automate more freely. In practice it means better mould accessibility, faster changeovers and often a lower-tonnage, therefore, lower-cost, lower-energy machine running your part than a conventional press would need.
Several of our plastic injection moulding machines are equipped with robotics for part removal, insert loading and downstream handling, which improves consistency, protects cosmetic surfaces and reduces cycle times.
We reinvest continually in new equipment and machines. Newer machines are markedly more energy-efficient and more precisely controlled than the previous generation, which shows up directly in part consistency and in the price we can hold for you.
Yes, complex and technical mouldings are where we add the most value.
We regularly produce parts with undercuts, side actions, sliding cores, unscrewing cores, living hinges, thin-wall sections, tight tolerances and demanding cosmetic finishes. Multi-cavity and family tools, hot runner systems, overmoulding and insert moulding are all within our scope.
The honest answer, though, is that "can it be moulded" and "can it be moulded economically" are different questions. Almost any geometry can be achieved if you're willing to pay for the tooling and the cycle time. Our job is to find the point where your design intent is met at a tool cost and cycle time that make commercial sense.
That's what the design for manufacture review is for. We'll look at wall thickness consistency, draft, radii, gate location, shrinkage and ejection, and we'll suggest changes that keep your function intact while simplifying the tool.
Send us your CAD and we'll give you a considered view, not a reflexive yes.
We offer an extensive range of in-house secondary operations, so parts leave us finished rather than half-made:
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Ultrasonic welding — four machines, including a 4,000 W unit for large weld areas
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Heat staking & Insert fitting — ultrasonic and heat insertion of threaded bushes and metal components
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Drilling and machining — post-moulding features that aren't practical to mould
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Sub-assembly and full assembly — including fastening, bonding and fitting of bought-in and moulded components
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Functional and dimensional testing — to your defined criteria
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Labelling and branding
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Packaging — from individual bagging to palletised, shrink-wrapped export packs
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Warehousing and distribution — UK and worldwide
Keeping all of this under one roof removes transport legs, handling damage, delay and most importantly the accountability gaps that appear when parts pass between suppliers. One purchase order, one point of contact, one company responsible for the finished item.
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Our injection moulding machines run from 50 tonnes to 480 tonnes of clamping force, across seven presses.
Tonnage refers to the clamping force holding the two halves of the tool shut against the pressure of the injected plastic.
The required tonnage is driven by the projected area of the part (including runners) and the injection pressure the material demands.
Having a spread from 50 to 480 tonnes matters commercially: we can match your tool to the smallest machine that will run it properly, rather than tying up an oversized press and passing the cost on. Our Engel tie-bar-less machines widen that flexibility further, since a large tool doesn't automatically force us onto a larger press.
We source globally, from established and reputable polymer producers and distributors. That's deliberate, the polymer market is genuinely international, and restricting ourselves to a single region would mean paying more, waiting longer and carrying more risk, none of which serves our customers.
Three principles govern how we buy:
Traceability. Every material arrives with documentation confirming exactly what it is. Certificates are recorded against production batches, so any part we've made can be traced back to the resin lot it came from.
Consistency. We don't switch grades or suppliers to shave pennies. An unannounced material change is one of the commonest causes of a part that suddenly doesn't fit or doesn't survive in service, and we won't introduce that risk into your product without telling you.
Security of supply. Global sourcing means we're not exposed to a single region's disruption. We maintain relationships with more than one source for key materials, so one supplier's problem doesn't become your production stoppage.
If you have an approved vendor list, a specific grade, or a free-issue material arrangement, we can work to it.
Our highest-volume work sits in polypropylene, ABS, polycarbonate, PC/ABS, nylon (including glass-filled grades) and acetal.
"Specialise" is worth unpacking, though. The skill isn't in having run a material before; it's in understanding how it behaves. Nylon is hygroscopic and must be dried correctly or you'll get splay and poor mechanicals. Polycarbonate needs high melt temperatures and careful gate design to avoid stress. Glass-filled grades shrink differently along and across flow. Acetal has a narrow processing window and shrinks heavily. Get those wrong and no amount of inspection will save the part.
At the demanding end, we also process high-performance polymers including PEEK and PPS where processing temperatures, tool design and thermal management all have to be right first time. These are unforgiving materials and expensive to scrap, experience genuinely counts.
We also work extensively with TPEs and TPUs.
We don't process PVC or LSR.
If you're weighing up materials, involve us early the choice affects tool design, and it's expensive to revisit once steel is cut.
There's no fixed minimum. We set it project by project, because the economics change completely depending on the part.
The determining factor is unit cost. Setting a tool and purchasing material carry broadly the same cost whether you then run 500 parts or 50,000, so on a low-value component those overheads need spreading further to arrive at a workable price. A higher-value part in an engineering or high-performance grade can justify a much shorter run.
Cycle time and part weight feed into it too, a 90-second cycle on a large moulding occupies a machine very differently from a 15-second cycle on a small one.
In practice, a lot of our customers agree an annual volume with us and take call-offs against it. That gets you volume pricing without volume stock, and because we hold your finished goods here, you draw them down as you need them.
Send us the part and your annual usage. We'll tell you what's economical and what isn't.
