GRP & Fibreglass Manufacturing - Custom Composite Moulders UK

Specialists in GRP and fibreglass composite manufacturing

Our glass-reinforced plastic (GRP) and fibreglass moulding services cover a wide range of components. At our large facility, we work on lower volume parts from typically 50 parts per year up to production requirements in their 1000s.

Quantum specialises in projects where there is a need for higher volumes of parts and have significantly invested in software and processes to ensure that we can deliver the right product at the right time.

Our Process: From Concept to Finished Component When you partner with Quantum, you get a clear, predictable end-to-end manufacturing process, and an experienced team of engineers. All our methods of GRP and fibreglass parts manufacturing have the same basic stages. Review the project design requirements and realistic timeline Identifying the best manufacturing process for the part Selecting materials based on specifications Continual communication to keep you in control Our Support Services
	GRP and Fibreglass Tooling Our in-house fibreglass mould making process requires a “plug” or pattern. Plugs are typically created by adding flanges to an existing part to use as a basis for the mould. CNC patterns offer the highest tolerances for repeatability A high quality finish is applied to the plug/pattern A mould is then made from the plug/pattern Moulds are carefully made to a high standard with reinforcement to ensure dimensional tolerances on all parts. Our Tooling Process
Lamination and Curing Applying Gelcoat to the mould to provide a durable outer layer Saturating glass fibres in resin and forming them into the shape of the mould The part cures within the mould for at least 3 hours before extraction Three distinct fibreglass lamination methods are available How a GRP Part is Made
	Trimming, Assembly, and Finishing Trimming excess material off the part, either by hand or a robot trimmer Assembly and adding fittings, such as hinges, threaded inserts and trims Hand finishing provides a high quality finish. Our Finishing Process
Inspection, Packing and UK delivery QC inspection and specific testing for application needs Wrapping and packing to requirements Some parts may have custom stillages for safe transportation and to ease loading and unloading UK-wide delivery or customer collection are both available Part Inspection, Packing and Delivery
	A leading contract manufacturer of custom fibreglass parts Fibreglass and GRP are ideal for bespoke components. With high strength-to-weight ratios, easy colouring and complete mouldability, composites can support complex geometries and integrated features that are unachievable with other materials. Material selection is a critical upfront consideration, so we will discuss with you the best composite layup for your part to ensure consistency and repeatability. Tooling considerations are also crucial for scalability; we plan the right tooling from the outset to manage lead times and production planning factors efficiently as your business grows. With our honest advice, we’ll always explain whether our composites are the optimal solution for your application. If GRP is the right choice, we can support you with design feasibility assessments.
Scalable, Consistent Production, Every Time Our services support the move from initial runs and prototypes to higher production volumes without sacrificing consistency. Achieving consistency in composites requires strict process discipline, which we embed into every stage. Our focus is on managing variation and ensuring every part is in the required tolerance. Maintaining surface finish control through careful material and tool handling. Keeping material consistency through rigorous checks on all incoming stock. Performing in-process checks to manage variation across production runs. Factors like tool condition, materials, and handling affect repeatability, and our internal controls are designed to mitigate these risks, giving you confidence in your supply chain.
	Reasons to Partner with Quantum Choosing a single fibreglass and GRP moulding partner gives you end-to-end confidence. We offer an integrated service: engineering, moulds, and manufacturing are all controlled in-house. This approach leads to better communication, more streamlined project management, and a more accountable partner throughout your project. Our experience with complex composite projects ensures we can reliably deliver what others might consider too challenging.
Start Your Project The best way to begin is through an early-stage discussion. We are ready to review your concept, advise on the best path to manufacture, or take on the production of existing composite parts. Request a Quote
FAQs What GRP Manufacturing processes do you offer? For complex parts and typically small batches, we use a hand-laying technique. Spray lay lamination is used for larger, open shapes to increase efficiency. Where parts require more consistent weight and thickness, internal layers such as foam or a smooth internal surface finish, we use RTM Lite, our closed-mould GRP technique. Once parts are removed from the mould, we trim the excess, either by hand or using a CNC robotic machine. Do you have minimum order quantities (MOQs)? We are a volume manufacturer, and generally accept projects turning moulds at least 100+ times per year. There are some exceptions to this rule if parts are small and simple, so we encourage you to contact us and see what is possible. What part sizes and tolerances can you achieve? We currently mould fibreglass parts as large as approximately 6m x 2.4m, down to 300mm3. We manufacture what we believe to be one of the largest RTM Lite parts in Europe! During assembly, we can fit multiple large parts together if required. The tolerance achieved, whether dimensionally or as a finish, typically depends on geometry and manufacturing method. Early on, we’ll discuss: Realistic levels for cosmetic surfaces Critical-to-quality dimensions and inspection method before manufacture Do you offer on-site support, installation, or assembly? Our on-site support is typically at the early stage of the project, to assist with developing your design and optimising it for manufacturing. This supports repeatability and part consistency. We provide post-manufacturing assembly and sub-assembly, adding fittings and features such as hinges or trims. What are typical lead times? Our lead times depend on the project. Typically, we can produce a prototype within 3 months of your accepting the quote. In some cases, higher quality and complexity requirements can lead to longer development phases. We will always discuss projected lead times with you, so there are no surprises.

MARKETS WE WORK IN

Industrial
The flexibility of GRP lends itself to shapes and colours that other materials struggle to achieve.
Leisure
From pop top roofs to fairground attractions and even the iconic London Eye, we have unrivalled experience within this sector.
Automotive
A long established history offering a complete body through to individual parts; all finished to exacting standards.
Marine
Quantum supply a diverse range of marine parts at levels for both leisure boats and luxury yachts.
Renewable Energy
Quantum have been making parts for this sector for a number of years.
Healthcare
High quality parts provide both professional and patient reassurance for healthcare applications.