top of page
  • ianmce

5 Common Myths About Plastic Injection Molding Debunked

Plastic injection molding is a versatile and widely-used manufacturing process that has been subject to many misconceptions. As a cornerstone of the plastic industry, it's essential to dispel these myths to understand the true capabilities and advantages of plastic injection molding. This article aims to address and debunk five of the most common myths that have long been misleading manufacturers, designers, and the general public.

Key Takeaways

  • Plastic injection molding can be cost-effective due to its efficiency and scalability, especially for high-volume production.

  • Advanced technology allows for the creation of complex parts with intricate designs and tight tolerances using plastic injection molding.

  • Sustainable practices and materials are increasingly being integrated into plastic injection molding, making it more eco-friendly.

  • Injection molding is versatile enough to be used for both short production runs and mass production, offering flexibility for various project needs.

  • Modern injection molding techniques have streamlined the process of color and material changes, reducing downtime and increasing efficiency.

1. Plastic Injection Molding is Too Expensive

One of the most pervasive myths about plastic injection molding is that it's prohibitively expensive. This belief often stems from the initial costs associated with the production of molds. However, when considering the long-term benefits, injection molding can be quite cost-effective. The economies of scale achieved through this process can significantly reduce the per-unit cost, especially for large production runs.

Tooling costs, while upfront, are a one-time investment that can be amortized over the lifespan of the project. Moreover, the precision and repeatability of injection molding reduce waste and the need for secondary operations, which can further drive down costs.

Here's a quick comparison of costs for different production volumes:

As seen in the table, the cost per unit decreases as the production volume increases, making plastic injection molding an attractive option for medium to high volume production.

2. Only Simple Parts Can Be Made

The myth that plastic injection molding is limited to creating only simple parts is far from the truth. Complex geometries and intricate designs are routinely achieved through advanced molding techniques and modern machinery. The process is highly versatile and can accommodate a wide range of complexities.

  • High precision in replication

  • Ability to incorporate multiple materials or colors in a single part

  • Feasibility of creating large parts with intricate details

Manufacturers often leverage the capabilities of plastic injection molding to produce parts for specialized services such as 3D printing, precision machining, and even jewelry/watchmaking tools. This personalized approach, combined with industry expertise, ensures that even the most complex parts can be made efficiently and to high standards.

3. Plastic Materials Are Not Eco-Friendly

The belief that plastic materials are inherently bad for the environment is a common misconception. Plastic injection molding can be quite sustainable, especially when manufacturers implement eco-friendly practices. One such practice is the use of recycled plastics, which significantly reduces the environmental footprint of plastic products.

Moreover, advancements in biodegradable and bio-based plastics are paving the way for more sustainable options in the industry. Here's a quick look at the types of eco-friendly plastics:

  • Biodegradable Plastics: These materials break down naturally over time, reducing long-term waste.

  • Bio-based Plastics: Made from renewable resources, they offer a reduced carbon footprint.

  • Recycled Plastics: Utilizing recycled materials conserves resources and energy.

While it's true that the production and disposal of plastics can be harmful, the industry is evolving with a stronger emphasis on sustainability. It's important to recognize that with the right practices, plastic injection molding can be part of a greener future.

4. Injection Molding Is Only for Mass Production

The belief that plastic injection molding is solely for mass production is a common misconception. While it's true that the process is highly efficient for large runs, modern advancements have made it viable for smaller quantities as well. Injection molding can be cost-effective for producing prototypes or limited-run items, especially when considering the long-term benefits of precise repeatability and material efficiency.

Here's a quick look at how injection molding serves different production needs:

  • Prototyping: Quick turnaround for design validation.

  • Short Runs: Economical for market testing and small batches.

  • Custom Orders: Flexible for specialized products.

  • Large Scale Production: Optimized for cost and speed in high volumes.

Injection molding's adaptability extends beyond production volume. It can accommodate complex designs and a variety of materials, making it a robust choice for diverse manufacturing requirements. Ian Coll McEachern's expertise in system architecture and technical content production further underscores the potential for injection molding to meet intricate design and engineering needs.

5. Color and Material Changes Are Too Time-Consuming

The belief that color and material changes in plastic injection molding are too time-consuming is a common misconception. Modern injection molding machines are designed for flexibility, allowing for quick changes in color and materials. This adaptability minimizes downtime and enhances production efficiency.

Color and material changes can be streamlined by following a structured process:

  1. Purging the injection molding machine of the previous material or color.

  2. Loading the new material or colorant.

  3. Adjusting the molding parameters to suit the new material.

  4. Conducting a few test runs to ensure quality.

With the right equipment and procedures, manufacturers can switch between different colors and materials with ease, debunking the myth that these changes are a bottleneck in the production process.


In dispelling the common myths surrounding plastic injection molding, we've uncovered the truth about its versatility, cost-effectiveness, and environmental impact. By challenging misconceptions, we empower manufacturers and consumers alike to make informed decisions about the use of plastic in their products. It's clear that when approached responsibly, plastic injection molding remains a vital component of modern manufacturing, offering unparalleled precision and efficiency. As technology advances, we can anticipate even more innovative solutions to emerge, further debunking myths and shaping the future of this industry.

Frequently Asked Questions

Is plastic injection molding more expensive than other manufacturing processes?

Plastic injection molding can be very cost-effective, especially for high-volume production. The initial tooling cost is offset by the low per-unit cost for mass production.

Can complex parts be manufactured using plastic injection molding?

Absolutely! Plastic injection molding allows for high precision and the creation of intricate designs that are difficult to achieve with other manufacturing methods.

Are plastics used in injection molding harmful to the environment?

While plastics have been criticized for their environmental impact, the industry is making strides in using recycled materials and developing biodegradable plastics to reduce this impact.

Is injection molding only suitable for large production runs?

No, injection molding can be used for both small and large production runs. Advances in technology have made it more accessible and cost-effective for producing smaller quantities.

How long does it take to change colors or materials in the injection molding process?

Color and material changes can be done relatively quickly. Modern machines have streamlined the process, reducing downtime and making it more efficient.

Can injection molded parts be environmentally sustainable?

Yes, by using recycled materials and designing for recyclability, injection molded parts can be more sustainable. Additionally, the precision of injection molding reduces waste during production.

1 view0 comments


bottom of page