April 3, 2024

The Ultimate Guide to Low Volume Injection Molding

low volume injection molding


Low volume injection molding is a manufacturing process. It is used for the production of small quantities of parts. These are mainly for prototyping, bridge tooling and early product development stages. In contrast to traditional injection molding, which is well suited for mass production with high tooling costs and longer lead times, low volume molding centers on being flexible and cost-effective. It is in line with the evolving requirements of current manufacturing.

In this guide, the low volume injection molding is covered in detail. It explains its meanings, benefits, and applications. It will also compare it with other manufacturing methods. Through this process, we will explore the material aspect of it as well as the design considerations. We will also touch on the topic of how rapid prototyping and product development strategies are the key factors in today’s fast moving market.

What is Low Volume Injection Molding?

Definition and Key Characteristics

Low volume injection molding makes small numbers of parts. It can produce from a few dozen to several thousand units. It is a method of plastic injection molding that allows for the efficient production of small to moderate quantities of parts. This process maintains the accuracy and strength of traditional injection molding. Yet, it’s made for quick production, lower costs, and flexible design and material choices. Its main features include using aluminum molds for faster production and less initial expense. Plus, it can adapt designs swiftly between production batches. This makes it perfect for prototypes, unique parts, and brief production periods.

Key Differences Between Low and Traditional High Volume Molding

There are a number of aspects which distinguish low volume molding from the traditional high volume molding. The main distinction is the amount produced and the production methods used. The main goal of the traditional injection molding technology is to make a big number of parts. The process is ideal for large quantities, so the per unit price becomes cheaper as the number of products produced increases. On the other hand, the low volume molding is designed to accommodate smaller runs, which eliminates the need for heavy investments in tools. This process is applicable for the production of small to moderate parts in number.

Another matter is the production process which is different. Injection molding is the traditional method that is suitable for long runs which is efficient and has high output. In this case, the molding process is adjusted to suit smaller volumes. With this, the installation process is faster and easier as well as more flexible.

Generally, the main distinctions between low volume molding and traditional injection molding are in the number of units produced, the manufacturing process, and the costs of tooling. Molding at low volume is a cost-efficient and flexible option for companies with smaller production needs and different requirements.

FeatureLow Volume Injection MoldingTraditional Injection Molding
Tooling CostsLowerHigher
Lead TimesShorterLonger
Design FlexibilityHighLow
Production QuantitySmall batchesLarge volumes
Market ResponsivenessAgileLess agile
CustomizationFeasibleLess feasible

Applications of Low Volume Injection Molding

Prototyping and Product Development

Low volume injection molding is of great importance when in prototyping and product development. It serves as a link between the theoretical design and the final product ready for the market. This is an important process that is especially beneficial for the industries like medical devices and consumer electronics. These industries have fast innovation cycle and the high cost of design errors. To illustrate, for the medical device industry, rapid prototyping with low volume injection molding facilitates bringing life-saving devices to the market in a fast way. It reduces the time to market to at least 50% compared to the usual methods. This approach not only shortens prototyping time, but also allows prototypes to match the final product in materials, weight and function. This allows for realistic testing and evaluation.

Bridge Tooling and Pre-Production Runs

Bridge tooling and pre-production runs are important in manufacturing. They help smoothly go from prototyping to large-scale production. This is especially true in the automotive industry, where launching a new model requires many unique parts. For example, a study showed that using low volume injection molding for initial auto parts can reduce lead times by up to 70%. This is faster than waiting for final steel tools. Making small batches for pre-production lets manufacturers find and fix production issues. This ensures a smoother increase to mass production.

Customization and Personalization

The growing demand for customization and personalization is changing consumer expectations in many industries. This ranges from unique medical implants to personalized consumer products. Low volume injection molding allows businesses to meet these needs affordably. For instance, in consumer electronics, manufacturers can offer personalized colors or limited edition models without large inventories. This is thanks to low volume production’s flexibility. A notable example is a phone case maker who used low volume injection molding to offer over 20 colors and textures. They could make batches as small as 100 units. This allowed them to enter niche markets and quickly adapt to changing consumer trends.

low volume injection molding

Step-by-Step Guide to Low Volume Injection Molding

Step 1: Design and Prototyping

The first action in the low volume injection molding process is to design and prototype. Using CAD software, designers and engineers create detailed 3D models of the part by taking into account the wall thicknesses, the materials to be used, and the part geometry. Prototyping, guided by rapid tooling techniques, enables a fast production of samples for testing and validation in order to verify that the design fulfills the specified and expected requirements.

Step 2: Choosing Your Mold Type

Selection of the appropriate mold type is an important part of low volume injection molding. Aluminum molds, for example, offer greater cost-effectiveness and shorter lead time than steel molds. They are apt for producing small amount of parts and are also easier and cheaper to be modified when design changes are required.

Step 3: Production Process

The low volume injection molding production procedure is based on the injection of molten material into the mold cavity under high pressure. This is a very well-controlled process, which guarantees the quality and uniformity of every item. Parameters like injection force, mold temperature, and cooling time are properly adjusted to achieve the desired result for the particular material and part design being used.

Step 4: Quality Control and Testing

The quality control and testing are the main factors of the low volume injection molding. All the parts are measured for dimensional accuracy, surface finish, and structural strength. Tests are done by using the sophisticated methods such as stress analysis and functional testing to make certain that all the performance criteria are being met. This rigorous quality control system ensures that even in small quantities each component is made at the top level of quality.

Benefits of Low Volume Injection Molding


One of the biggest advantages of small production runs through injection molding is that it can help cut production costs. This approach reduces your initial costs for the purchase of equipment and the creation of facilities. This is a major factor, which becomes significant when the product development is happening for the first time. It also doesn’t make more items than needed, so this leads to less wastage. It makes it an even more cost-effective option.

Faster Lead Times

One more advantage is that it accelerate the things, reducing production times. Using specific molds and the direct method of making things accelerates the process of making and delivering products. This gives the companies the ability to instantly respond to the new market trends or to redesign the products. Having the ability to move quick is a crucial attribute that helps us to stay ahead of the competition and meet the deadlines that are too strict.

Flexibility in Design Iterations

Making small samples makes it easier to change the design as needed. It is affordable and products can be made fast therefore companies can try different looks, various materials, and setups. This feature of being able to test and modify the designs without much hassle is what sets apart a good product idea from a bad one. It cuts out the usual high expenses and long delays that are typical with conventional methods of producing goods.

Briefly, injection molding for smaller quantities of parts is advantageous due to the reduced cost, less time, and the possibility to make changes in the design easily. These strengths greatly contribute to the reduction of expenses, flexibility, and the promotion of creativity.

low volume injection molding

Injection Molding Materials for Low Volume Production


Thermoplastics are flexible materials. They are popular in low volume injection moulding because they are easy to process and have many properties. Important thermoplastics include:

  • ABS (Acrylonitrile Butadiene Styrene): This material has strong mechanical qualities, great impact strength, and is simple to shape and refine. It’s perfect for car parts, consumer products, and electronic cases.
  • Polycarbonate (PC): PC is known for its high strength, toughness, and clearness. It’s used where visibility and durability are needed, like in medical tools and protective gear.
  • Polyethylene (PE): Coming in different densities, PE is famous for its flexibility, chemical resistance, and toughness. It’s used in packaging, containers, and pipes.
  • Polypropylene (PP): PP stands out for its resistance to chemicals, heat, and wear. It’s used in car parts, containers, and flexible hinges.


Thermosets offer excellent mechanical strength and heat stability. They are good for demanding uses. Common thermosets include:

  • Epoxy: This provides strong mechanical qualities, good heat resistance, and strong gluing ability. It’s widely used in aerospace, cars, and electronic parts.
  • Phenolic: Known for high mechanical strength, heat resistance, and flame safety. It’s used in electrical parts and appliances.
  • Silicone: Silicone is notable for its flexibility, heat resistance, and insulating qualities. It’s often used in medical tools, car parts, and cookware.

Material Selection Considerations

When choosing materials for low volume injection molding, think about several factors to ensure the part meets all needs:

  • Intended Use: Think about the mechanical stress, environmental exposure, and lifespan of the part.
  • Environmental Conditions: Look at temperature extremes, chemical exposure, and UV light.
  • Mechanical Requirements: Consider flexibility, strength, impact resistance, and life under stress.
  • Cost and Availability: Check the material cost and availability, including any wait times for getting it.
  • Process Compatibility: Make sure the chosen material works well with low volume injection molding. Think about melt temperature and mold shrinking.

By carefully choosing materials with these factors in mind, makers can improve the performance, durability, and cost-effectiveness of their low volume injection molded parts.

Low Volume Injection Molding vs. Alternative Manufacturing Methods

3D Printing

3D printing can be compared to low volume injection molding. It can, in fact, quickly make small quantities of parts without using the traditional tooling. 3D printing gives designers more options and allows them to make intricate shapes. On the other hand, a more expensive but superior output can be attained through the use of low volume injection molding in the production of parts with better surface, greater strength and at a lower cost per unit for larger quantities.

CNC Machining

The CNC machining is another process that is good at making high precision parts. However, low volume injection molding is less expensive when it comes to producing small to medium part numbers. It is a good use of materials and produces parts in a short time. Injection molding also makes it feasible to use more materials. It provides more of the freedom in the mold design and function.

Vacuum Casting

The vacuum casting process is suitable for the production of high-quality prototypes and small batches of intricately detailed parts with an excellent surface. Yet, low volume injection molding is a more scalable option for larger quantities. It uses the same process and materials as mass production, ensuring consistency in all product development stages.


Low volume injection molding is an important step forward in the field of manufacturing. It links prototyping with mass production. This is a low-cost, versatile, and powerful method to make small number of parts. This enables the companies to make quick and accurate changes as well as enhancements to their products. The increasing demand for customization and quick product development will inevitably make low volume injection molding an essential part of the manufacturing process in the future. It is a multi-faceted instrument for companies to give their imagination a shape.

You can solve the problems of low volume injection molding with the help of experts. ACO Mold with its long-standing 20 years of experience is ready to give a helping hand. Whether you’re just starting with low volume injection molding or trying to improve your current production, ACO Mold is the right company for you because of its expertise, technology, and customer approach. We welcome you to contact ACO Mold to explore how low volume injection molding can be used to support your product development and manufacturing goals. We are here to help you transform your creative concepts into a tangible form using our precision, efficiency, and cost-effectiveness.

Frequently Asked Questions

What are the fastest possible lead times for low volume injection molding?

The lead times for low volume injection molding that are the shortest may range from days to weeks. The complexity of the part and the material is the determining factor. We will use aluminum molds and improve the production process to make the project times much shorter, thus enabling the job to be done fast.

Can low volume injection molding be used for production parts, or is it only suitable for prototypes?

Low volume injection molding is a good option not only for prototypes but also for production parts. It is perfect when it comes to limited edition items, custom made parts, or when small scale production is required. The process yields the same quality and material features as traditional injection molding but with more flexibility and lower costs.

How can I transition from low volume to high volume injection molding as my production needs grow?

To move from low volume to high volume injection molding, scale up the production process. It might be with steel molds for their durability and large-scale production capacity. Additionally, the examination and possibly the improvement of the part design for mass production should be attended to. Look into the material, shape, and molding process to see where and how you can improve the process.

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