Top 10 Questions to Ask Your Custom Injection Molding Provider

Choosing the right custom injection molding provider is crucial. Whether you need to manufacture a medical device, consumer product, or automotive part, asking the right questions can help ensure you get consistent quality, competitive costs, and an efficient process from start to finish.

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What are the key things to know? This blog post was written to provide helpful insights. Here are the top 10 questions to guide your decision when evaluating a custom plastic injection molding partner.

1. WHAT EXPERIENCE DO YOU HAVE IN CUSTOM INJECTION MOLDING?

Experience is key to creating custom-molded parts, regardless of whether they’re small and intricate or large and durable. Look for an injection molding company with expertise in your sector. This means identifying a company that not only has been providing injection molding service for many years but also employs engineering experts with a wealth of knowledge.

A team with years of experience in custom injection molding and familiarity with your industry can better navigate challenges associated with mold design, tooling, and production of high-quality parts that meet your unique needs and exact specifications.

2. WHAT MATERIALS CAN YOU USE IN THE PLASTIC INJECTION MOLDING PROCESS?

The choice of resin used in plastic injection molds determines the final product’s durability, flexibility, and performance. Ensure your provider works with a wide range of materials such as:

• High-density polyethylene (HDPE)
• Linear low-density polyethylene (LLDPE)
• Polypropylene (PP)
• Nylon (PA)
• Acrylic (PMMA)
• Acetal (POM)
• Kostrate / polycarbonate (PC)
• Polystyrene (PS)
• Acrylonitrile Butadiene Styrene (ABS)
• Thermoplastic Polyurethane (TPU)
• TPR Thermoplastic Rubber (TPR)

A company that utilizes a variety of plastic materials and has in-depth knowledge of their properties will be able to make suggestions to ensure your custom plastic product has the right properties and can be manufactured as efficiently and affordably as possible.

3. CAN YOU PROVIDE DESIGN ASSISTANCE OR PROTOTYPING SUPPORT?

Efficient injection mold design is crucial for the success of any project. Ask if your provider offers value-added services like computer-aided design (CAD) and prototyping services to test your designs before mass production.

Providers with a CNC machine and 3D printer can quickly create prototypes, helping refine the design for consistent quality during the manufacturing process.

4. WHAT IS YOUR TYPICAL LEAD TIME FOR PRODUCTION?

A provider with state-of-the-art equipment, reliable manufacturing processes, and quick cycle times can ensure you’ll meet production deadlines. Discuss their typical lead times and whether they can accommodate your project demands.

Delays in tooling or the plastic injection molding process can impact your entire supply chain.

5. DO YOU OFFER LOW-VOLUME OR HIGH-VOLUME PRODUCTION OPTIONS?

Not every project demands large-scale production. Whether you need low-cost prototypes or high-volume production, your provider should offer flexible solutions tailored to your requirements.

This is especially important for custom plastic parts with tight tolerances or complex geometries, which may require specialized molds or low-volume production runs for initial testing.

6. HOW DO YOU PROVIDE QUALITY ASSURANCE THROUGHOUT THE PROCESS?

Producing high-quality products requires proven quality assurance (QA). Look for providers that assure quality by following a thorough process with checks and optimizations at every step from start to finish. This process should be carried out by industry experts who can identify and resolve potential issues that machines may miss.

A potential manufacturing partner must be able to meet or exceed industry standards and adhere to specific industry certifications. When vetting a company, ask about their experience with your industry and what they do to ensure your exact specifications are met.

7. CAN YOU SHARE EXAMPLES OR CASE STUDIES OF PAST WORK?

A reliable injection molding supplier should have a portfolio of successful projects or case studies. Ask about industry-specific examples to learn about their expertise in action.

For example, a case study on creating custom plastic parts for the aerospace industry or injection molds for medical devices can showcase their ability to meet stringent requirements to satisfy customer needs.

8. WHAT COSTS SHOULD I EXPECT AND ARE THERE ANY HIDDEN FEES?

Understanding the full cost of your injection molding project is essential for budgeting. Costs typically include:

• Tooling and mold design
• Material costs
• Production and finishing costs

Ask for a transparent quote and discuss any potential hidden fees, such as maintenance costs for injection molds or secondary processes like CNC machining.

9. WHAT INDUSTRIES DO YOU SERVE AND CAN YOU HANDLE MY SPECIFIC NEEDS?

Providers with experience across diverse industries are better equipped to handle unique challenges. They will have a variety of experiences from which to draw which can give you confidence they can complete your project efficiently, on budget, and to your exact specifications.

Injection-molded products can be used in a variety of industries:

• Automotive
• Medical
• Consumer products
• Electronics
• Construction
• Packaging and storage
• And more

10. WHAT SETS YOU APART FROM OTHER INJECTION MOLDING COMPANIES?

Finally, after you ask all the other questions and are satisfied with the answers, you can give the company a chance to tell you what makes them unique and better than their competitors. Is their manufacturing technology more advanced? Do they offer faster lead times? Are their value-added services more diverse and better? Do they provide the best overall value?

Getting an overview of their unique selling propositions (USPs) will help you assess whether they’re the right partner for your next injection molding project.

READY TO FIND YOUR IDEAL CUSTOM PLASTIC INJECTION MOLDING PROVIDER?

Finding the right custom injection molding provider starts with asking the right questions. From understanding their expertise in plastic injection molding to ensuring they can meet your part quality and budget requirements, these questions will help you make an informed choice.

February 1,

When it comes to choosing the right plastic injection molding manufacturer, it can be hard to know what you don’t know. Who do you trust? How many questions should you ask? What questions, specifically, should you be asking? With so many variables at play, it’s a challenge to feel like you’re choosing the right manufacturer.

However, based on our decades of experience, we’re able to confidently say the best manufacturers have five major characteristics in common:

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1. DF(x) Engineering
2. Assembly, Painting, and Secondary Options
3. Supply Chain
4. Automation and Robotics
5. Tooling Design and Maintenance

To make your choice a little easier (and ease some stress), let’s take a closer look at all five.

1. DF(X) Engineering

Short for “Design for Excellence,” DF(x) is a group of design principles that are key to design success. In our experience, the most important values for x include these four critical elements.

Cost

Some designs include cosmetic details that don’t add to functionality, but definitely increase cost. While some parts of a product are imperative for the part’s functionality, non-functional details can be costly. Just as one example, a simple lifter or slide will increase the cost and cycle time of your tool by increasing labor costs. As a whole, a simple design addition makes the entire part more expensive to manufacture. An experienced manufacturer should be pointing out design areas for cost savings, not building in cosmetic details that do little in the end.

Quality

Cosmetics, however, can add to quality as well. It’s important that your manufacturer is looking at the parts within the product that are critical to the tolerances and quality required to be a functioning product. If any of those fail, you’ll never hit your tolerances or functionality, making it impossible to hit your quality requirements.

Material

Experience with specific materials is important. Certain materials act differently inside different injection molding presses. Experienced plastic injection molding manufacturers not only know this, but they understand the nuances different materials bring to the table.

Additionally, your manufacturer should not just be designing for specific materials, but should be helping with material selection too. While a specific material might sound great to you, an experienced manufacturer will know that a less expensive option may still offer what you need.

Manufacturability

Ultimately, you have to make sure your product is actually manufacturable. The way you intend for a product to function has to be compatible with the way you want to manufacture it.

Some plastic injection molding manufacturers will simply build your product the way you designed it without pointing out potential issues. But once hot plastic is pushed into a steel tool, you’ll want someone with the kinds of experience to ensure you get the product you desire, without later issues that become costly to correct. Draft and radii are important elements to build into the design along with identifying possible sink areas.

To learn about injection molding design tips, check this out.

2. Assembly, Painting, and Secondary Operations

Many products will require secondary finishes after parts come off the line. It’s important to consider whether your manufacturer has the ability to assemble your product in-house or apply finishes right away.

Keep in mind, also, that manufacturers who outsource secondary operations will have to ship your products and manage those operations on your behalf. Multiple touchpoints can increase the risk of damage. It becomes much harder to expedite shipping. You open yourselves up to quality issues. And, in the end, you’ll need longer lead times

If your product will need to be painted, pad printed, silk-screened, hot stamped, coated, or plated, it’s good to know in advance whether your manufacturer will be handling those processes in-house or if you need to outsource those processes.

3. Supply Chain

It is critically important to have a plastic injection molding manufacturer with a well-rounded supply chain team, especially if you have a product that requires assembly. Look no further than the very long supply chain issues for the COVID vaccine for evidence of the impact of supply chain issues. The manufacturer should be well connected with resin suppliers and be able to manage purchasing and lead-times of components that are required to assemble your product.

Part of working with a manufacturer that has extensive supply experience is knowing where your end-ship location is. If the final destination of the product is going from the manufacturer to Atlanta, but you’re manufacturing in China, you could be facing a number of environmental, time, cost, and logistical impacts. If your product is being shipped throughout North America, you should definitely be considering a North American manufacturing partner.

4. Automation and Robotics

How advanced is your injection molding manufacturer? Does your injection molder have the capabilities you need to produce your product — the right size machines, enough capacity, ability to scale your program?

In the end, you’re trying to create high-quality molded parts with the most cost effective production processes. Automation and robotics can help speed up and simplify the plastic injection molding process, resulting in more efficient cycle times, reduced manual labor costs, decreased waste, and increased part precision.

It's important to ask your manufacturer if they have invested in automation and robotics, if they're looking for ways to improve their processes for their customers. Make sure to partner with a molder who is innovative and can keep you ahead of your competition.

To read more about the benefits of automation and robots, check this out.

5. Tooling Design and Maintenance

Domestic

If you need something fast, having a domestic manufacturer handle your tooling is the way to go. You might have to pay a little bit more in the long run, but it’s because everything would be manufactured state-side, you’re able to cut leads times, meaning you get to market faster. And if you’re a company who values U.S.-only solutions, this is really your only choice.

International

If you choose an international manufacturer for your tooling, cost savings is the most obvious advantage, here. It’s possible to achieve decent lead times as well. Don’t forget, though, that at the end of the day, whatever you build still has to be put on a boat and shipped. It will take time, often weeks. Weighing this against cost savings is often overlooked.

That said, it is possible to find an inexpensive, but quality resource with decent lead times. However, they will require a lot more vetting than a domestic manufacturer will.

It's important your injection molding manufacturer can navigate this for you. They should have trusted domestic and international suppliers as well as experienced tooling design engineers on staff. Here at Cadrex, we’ve visited all of the facilities we use in North America and Asia. We can personally vouch for them and their quality.

In-House Maintenance

When it comes to taking care of your tool, it’s really important that you work with a manufacturer who can provide in-house tooling maintenance. There is never a “perfect tool.” Things will happen and tool maintenance will be required. In fact, preventative maintenance should be part of your manufacturers routine.

Because your manufacturer is deeply embedded in the process, they will be able to pay more attention to your project, ensuring the quality of the tool will work within your desired manufacturing environment.

To learn about injection molding tooling design tips, check this out.