7 Benefits of plastic injection moulding for your company

1. It’s cost effective

Plastic injection moulding is one of the most cost effective ways to produce large quantities of products. Before production starts, a custom metal mould tool needs to be built, shaped exactly like your part, and this is where most of the upfront cost sits. It’s a one off cost though, and once the tool exists, it can be used again and again to produce the same part thousands of times over. 

This is where the long term savings build up over time. The higher the quantity of parts you produce, the lower the cost per part. Larger production runs tend to be more automated, which reduces labour costs, and buying raw plastic material in bulk brings the natural cost down too. The more you order, the more efficient the whole process becomes. 

Material choice also plays a part. Standard materials and colours that a moulder already stocks are usually cheaper than sourcing something bespoke. If you’re not tied to a specific shade or specialist materials, sticking with off the shelf options can keep costs down without affecting the quality of the finished part. Keeping the product design simple where possible has a similar effect, fewer complex features generally mean lower tooling and production costs. 

Buying the same products from a third party supplier is usually far more expensive in comparison, especially once you’re ordering regularly. You end up paying someone else’s margin on top of the manufacturing cost, with little control over pricing as your order volumes grow. Producing your own parts means that control sits with you instead. 

2. It’s quicker to produce

Producing your own plastic parts gives you far more control over your supply chain. Rather than relying on a third party to hold enough stock, or risk running into their out of stock periods, you can align production with your own schedule and get parts made exactly when you need them. 

Lead times are also a major factor here. If you’re sourcing parts from overseas, delivery times can be extended by shipping schedules, customs checks, communication and other delays outside of your control. Working with a moulder based in the UK avoids a lot of this. With the right preparation, parts can move from production to delivery in a matter of days rather than weeks. If something urgent comes up, a local supplier can react and adapt far more quickly than one on the other side of the world.

This becomes especially useful if you ever need to make a change to your product. Adjustments to a mould tool or a production run are far simpler to coordinate with a supplier you can speak to directly and visit in person, rather than managing changes across time zones and language barriers. 

3. It delivers a high quality finish 

Plastic injection moulding delivers a consistently high quality finish, part after part. Unlike methods such as 3D printing, which can leave visible layer lines on the surface, injection moulding produces a smooth, polished result straight out of the mould. There’s unusually no need to trim, reshape or polish afterwards. 

This consistency comes down to the process itself. Once a mould tool is built and set up correctly, every part produced from it follows the same shape with a strong level of accuracy. This matters most for components that need to fit precisely with other parts, known as tight tolerances, since even a small variation can cause fitting of performance issues down the line. Because the process is largely automated, there’s less room for the inconsistency that comes with human error. 

The finish itself is also flexible. Textures, gloss levels and surface details can be built into the mould tool at the design stage, giving you a wide range of finish options to suit how the product will look and function. 

4. Parts have a high strength to weight ratio

Plastic injection moulded parts offer a strong strength to weight ratio compared to many other materials. In simple terms, this means the parts are strong for how light they are, which matters when you’re producing anything that needs to be durable without adding unnecessary bulk or cost. 

This is partly down to the properties of the plastic itself, but it can also be improved further. Additives and fillers can be blended into the plastic during production to change how it performs, making it more rigid, more resistant to impact, or more resistant to fire. These options give you a level of control that materials like metal or glass often don’t offer in the same way, since you can tailor the exact properties of your part to suit how it’ll be used. 

A practical example of this is something like a plastic housing for a piece of equipment. It needs to be light enough to keep transport and handling costs down, but strong enough to protect what’s inside from knocks and drops. Injection moulding, with the right material and additives can achieve both at once. 

5. It offers tailored finishes

Injection moulding gives you a wide range of choice over how your product looks and feels, from the material itself through to colour and texture. These decisions are usually made at the design stage, when the mould tool is being planned, but there’s often flexibility to leave some choices open for later too. 

Colour is a good example of this. If your branding changes down the line, or you simply want to offer a product in a different shade, this can often be done without needing to redesign or rebuild the tool itself. The same goes for surface texture, whether you want a smooth, glossy finish or something more matte and grippy, this can be built into the mould to suit how the product will be used and handled. 

There’s also flexibility when it comes to branding details like logos or patterns. Rather than etching these directly into the main tool, they can sometimes be built into a separate, interchangeable insert instead. This means if your logo or pattern changes in future, only that smaller insert needs to be swapped or updated, as opposed to the entire mould tool. It’s a simple way to keep the door open for change, without the cost of starting again from scratch. 

Material choice also plays into this. Different plastics behave in different ways, some are more flexible, some more rigid, some better suited to withstand heat or sunlight. Picking the right one for your product, alongside the right finish, means the end result performs well and looks the part too. 

6. It avoids risk of obsolescence 

When you rely on a third party for parts, there’s always a risk that a specific part could be discontinued, changed, or become harder to source over time. This is known as obsolescence, when a part is no longer being made or supported. If that happens, it can force sudden redesigns, unexpected costs, and delays to production, often at short notice and outside of your control. 

Owning your own mould tool removes a lot of this risk. Since you control production of the part yourself, it won’t simply stop being available because a supplier has changed their range or moved onto something else. As long as the tool exists and remains in good condition, the part can keep being produced exactly as it was, giving you a level of long term security that buying in parts from elsewhere doesn’t offer. 

This also gives you more freedom to plan ahead. Rather than needing to hold large amounts of stock in case a part becomes unavailable, you can produce parts as and when you need them, in line with your manufacturing chain. Some manufacturers can also produce parts in advance and store them on your behalf, dispatching them either on a regular schedule or whenever you request them. 

7. It reduces your carbon footprint

Injection moulding is a relatively efficient manufacturing process, and it produces very little waste compared to methods that cut or shape parts from solid materials. Most of the waste generated during a run happens at a start up, and even then, a lot of this can be reprocessed and fed straight back into the moulding cycle rather than thrown away. Over a long production run, this adds up to a manufacturing process that wastes very little material overall. 

Choosing a UK based moulder also plays a part here. It removes the need to import parts from overseas, often from countries with longer supply chains, which cuts down on the fuel and packaging involved in getting your product to you. Working locally also gives you more say over the materials used in your product, including the option to use recycled materials where suitable, which can help lower both waste and your products’ overall environmental impact. 

Why it’s worth choosing a UK based injection moulding company 

You may have noticed a running theme through a few of these benefits already. Faster lead times, lower emissions, cost effectiveness, and greater control are all additional benefits that come down to working with a moulder based in the UK, rather than overseas. 

Choosing a UK supplier means you can visit the factory, speak directly with people making your parts, and catch any issues early rather than after a shipment has already arrived. It also tends to work out cheaper than it first appears, since overseas pricing rarely accounts for shipping, customs and exchange rate costs on top of the base price. And with everything produced closer to home, you’re far less exposed to the kind of global disruption that’s affected supply chains in recent years. 

At Bowles & Walker, everything is designed, tooled and produced from our site in Norfolk, so you always know exactly where your parts are coming from, and who’s making them. 

How Bowles & Walker can help

Every project that comes to us is different. Some of the companies we work with are completely new to injection moulding, perhaps testing out patented product ideas and looking to produce a small first batch. Others are established businesses looking to switch from their current supplier, often after running into the exact issues covered above, long lead times, rising costs, or a lack of control over quality. 

Either way, our approach stays the same. We take the time to understand what you’re trying to achieve, then work with you to find the most cost effective way of getting there. That doesn’t always mean building a brand new mould tool. If modifying an existing product would do the job just as well, we’ll say so, even if that means a smaller job for us. We’d rather be upfront about what actually makes sense for your business than sell you more than you need.

If you’re not sure where to start, that’s fine too. Get in touch and we can talk through your project, whatever stage it’s at. Send us an enquiry via our online form or give us a call on 01953885294.