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Choosing the right injection moulder is one of the most important decisions you'll make when developing a plastic product. Whether you’re launching a new design or transferring tooling from an existing supplier, asking the right questions from the start can save you time, money, and frustration.
Below, we’ve outlined the key questions you should ask any injection moulding company before starting a project. These will help you assess their capabilities, avoid common pitfalls, and ensure they are a good fit for your requirements.
1. Do You Offer In-House Toolmaking?
Tooling is the foundation of any injection moulding project. Some moulders outsource this process, while others manufacture tooling in-house. By choosing a supplier with in-house toolmaking, you gain better control over lead times, quality, and ongoing tool maintenance.
At Great Central Plastics, we manufacture our tooling in-house, ensuring consistency and faster project turnaround. This also means any modifications or tool maintenance can be carried out on-site for maximum efficiency and cost-effectiveness.
2. What Industries Do You Work With?
Experience within your sector is invaluable. For example, automotive projects often require high levels of precision and specific material properties. Food-grade components must meet strict compliance standards. Promotional items require vibrant colours and secondary processes for decorative finishes and branding.
Ask for examples of similar projects or industries served, and whether the moulder understands your product’s end-use requirements.
3. What Materials Do You Work With?
Not all injection moulders are experienced with the same range of materials. You should ask about their knowledge of the specific polymers you require, including any recycled or food-grade materials. If your project has sustainability goals, check whether they can mould eco-friendly plastics such as bio-based or recycled compounds, which can act differently in the moulding process than traditional polymers.
GCP, for instance, offers a wide selection of standard, engineering-grade, and sustainable materials to suit a wide range of applications, with years of experience in moulding in each.
4. What Is Your Minimum Order Quantity (MOQ)?
Some companies specialise in high-volume runs, while others are more flexible. If you’re looking for short runs or prototypes, ensure the moulder can accommodate low-volume production without excessive tooling or setup costs.
Our own facilities are set up for both low and high volumes, with flexible MOQs starting from just a few hundred parts in many cases. We’re just as experienced in handling hundreds of thousands or millions of components. Just get in touch to discuss your project and we can find the best solution for you.
5. Can You Assist with Design for Manufacturability (DFM)?
Your design might look good on screen, but it must also be suitable for moulding. A good injection moulder should be able to advise on Design for Manufacturability, helping you avoid defects, reduce material waste, and ensure cost-effective production.
At Great Central Plastics, we offer design support at every stage, including CAD, prototyping, and DFM reviews, making sure your design is as efficient and cost-effective as possible when production begins.
6. What Secondary Processes Do You Offer?
Finishing processes can be just as important as the moulded part itself. If your product requires printing, chrome plating, assembly, or special packaging, check whether the moulder can manage this in-house or through a reliable partner.
We offer a wide range of post-moulding services, including printing, welding, decorative finishes and assembly, all carried out on site.
7. What Quality Control Measures Are in Place?
Injection moulding requires consistent process control. Ask about inspection procedures, tolerance standards, and whether they work to ISO or other quality standards.
GCP operates to ISO 9001:2015 and conducts regular quality checks throughout the process to maintain high standards, giving our customers the confidence to meet all quality and timescale requirements for their projects.
8. How Do You Handle Tool Maintenance and Modifications?
Injection mould tools require maintenance, especially during long production runs. Ask how the company looks after your tool and what support is provided for repairs or future modifications.
At GCP, we offer lifetime tool maintenance free of charge for tools we produce and continue to run, providing peace of mind for our customers.
9. Can You Produce Prototypes Before Committing to Full Production?
Prototyping can help identify design flaws before investing in tooling. Check whether the moulder offers 3D printing or other methods to produce prototypes for design validation and functional testing.
We provide rapid prototyping using advanced 3D printing technology, helping bridge the gap between concept and mass production.
10. What Is the Typical Lead Time?
Understand how long each stage of the process will take, from design approval to tool manufacture to first production. If you have a deadline in mind, ask whether the moulder can realistically meet it.
We pride ourselves on delivering honest lead times and transparent communication throughout every project. While each project is different, depending on complexity and scale, we’ll always be realistic upfront, to keep our customers in-the-know.
Final Thoughts
Selecting the right injection moulding partner is about more than just the price per unit. Many other considerations need to be taken into account, to incorporate the total cost of a project, in terms of time, value and quality. The answers to the questions above will help you assess capability, capacity, and compatibility with your specific needs.
If you’re planning a project and want expert advice from a company with over 25 years of experience, Great Central Plastics is ready to help. Contact our team to discuss your requirements and find out how we can support your next injection moulding project from start to finish.
For more information on Top Questions to Ask Injection Moulders Before Starting a Project talk to Great Central Plastics Ltd