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Switching From Metal to Plastic

The manufacturing sector is constantly evolving as new trends and processes emerge. Among the most interesting trends is the relatively new idea of designers to replace metal parts with plastic injection molding.

If this trend is new to you, the idea may seem a bit unusual. Ever since mankind learned how to machine the material, metal parts have been the gold standard in many applications.

However, with advances in both technology and materials, this view is slowly beginning to be challenged. In many high-tech industries, such as automotive and aerospace, there has been a significant shift toward the use of advanced, sophisticated plastics in areas that were once the exclusive domain of metals.

The exact reasons for this can vary from part to part, but there are several factors that typically come into play:

* Weight
 * Strength
 * Reliability
 * Sustainability
 * Surface area
 * Cost



One of the most important reasons for switching to plastics is weight. In the vast majority of situations, metal parts are heavier than plastic parts. And when these parts are incorporated into a high-performance car or even an airplane, every single gram that can be saved in the design can lead to improved performance.

But weight doesn't just play a role in billion-dollar high-performance projects. Even relatively mundane products can benefit from weight reduction when it comes to factors such as ease of use and transportation costs. Even a seemingly minor reduction of ten percent can have a noticeable impact on the amount you pay to get your product to customers or into stores.


While it's true that metals are generally stronger than plastics, in fact, switching to plastic components can result in increased strength and performance in certain situations. Engineering plastics can outperform metals in terms of tensile strength - the maximum load a material can take when stretched before breaking.

This advantage is particularly evident when considering strength-to-weight ratios, a factor that is of paramount importance in many applications.


In addition, plastic parts can be more reliable and stronger over time than their metal counterparts. This is due to the use of additives in the plastic that slow oxidation and degradation processes, which in turn increases the durability of the product.

Many plastics also have greater chemical resistance than metals and do not corrode as easily. This often has the advantage of reducing the need to treat products and parts before they are used, or making it possible to sell products that last longer or require less maintenance.


Despite improved reliability, every product eventually reaches the end of its useful life. Even in this case, plastics can offer an advantage because they are much easier to recycle. Melting and remelting metals takes much more time and energy than recycling thermoplastics.


Although surface finish is rarely important for internal parts, for external parts, the various finishes of plastics can offer many advantages over the uniform metallic appearance of metals. Injection molded plastic parts can be produced with virtually any color or texture imaginable.

So not only can designers show off their creativity, but they can also easily add a company logo to parts. You don't have to paint or glue a logo on, you can make it an integral part of the design.

The smooth surface of plastics can also be an advantage for finishing. Plastic parts don't need to be deburred as intensively as metal parts, and assembling the finished product is much easier because there's no welding involved.


Plastic parts are generally much less expensive to manufacture than metal parts. There are also lower shipping and assembly costs. Since the cycle time for injection molding plastic parts is much shorter than for metal parts, such plastic parts are generally easier and less expensive to produce.

Of course, plastics will never be able to replace metals in every situation, but their use is certainly worth considering. If in doubt, you can always consult the experts if you plan to replace some metal parts with plastic ones.

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