When you need plastic parts for your product, you want a plastics manufacturer that is reliable, affordable, and produces high-quality parts. There may be a lot of options, so it is important to narrow down the field with the right criteria.

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What is a plastics manufacturer, and what do they do?

A plastics manufacturer is a company that produces plastic parts. The most common way this is done is through injection molding, but some plastics are made using other methods such as blow molding or extrusion. A plastics manufacturer may also build molds, prototype parts, or offer post-production services such as pad printing.

Why Choosing the Right Injection Molding Supplier Matters

If you’re developing a plastic part, the success of your product often depends on the capabilities and reliability of your injection molding supplier. Beyond just producing parts, the right supplier will help you with design, prototyping, material selection, and on-time delivery. Choosing wisely can save you time, money, and future headaches.

What to Look for When Choosing an Injection Molding Manufacturer

You need a list of criteria based on your personal needs to ensure that the manufacturer you select is the best one for your project.

1. Know the Budget for Your Project

Affordability is very important for any project. When you find plastic injection molding manufacturers, request quotes for your specific part—this is offered for free by most companies. Prices can vary widely, so it’s important to confirm whether they can stay within your budget.

2. Plastic Manufacturer’s Volume and Capacity

How many parts will you need, and when will you need them? These are essential questions to ask when meeting with a plastic manufacturer. Depending on their machine capacity, operating hours, and workload, they may or may not be able to meet your volume requirements on schedule.

3. Product Materials and Applications

When discussing the specs of your part, you’ll want to have an idea of what material to use. If you’re unsure, a good injection molding manufacturer can offer valuable guidance based on the material properties and what has worked well in past projects. You’ll also want to make sure they can handle any secondary needs, like inserts or printing.

The company is the world’s best custom plastic molding supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

Image to the left: Printing is applied to a part after it leaves the mold.

4. Feedback, Prototyping, and Advice

You know your product best, and your manufacturer knows plastic. Look for a company that offers honest feedback, helpful suggestions, and thorough prototyping before building a mold. A company that communicates well with transparency and respect will make your job a lot easier.

Image to the right: A plastic part with hydrographics applied for a camouflage print.

5. On-time, Quality Products

Finally, read reviews and evaluate sample products from your potential supplier. If past customers say the products were delivered on time, were high quality, and the company was easy to work with, that’s a strong indicator you’ve found a trustworthy partner.

Image to the left: A plastic part with a threaded metal insert. 

Schedule an Appointment

Rex Plastics has been in the business for over 50 years, doing plastics manufacturing for all kinds of customers. We will work with you to ensure that your needs are met when it comes to producing a high-quality final product. Check out our past projects and reach out to us for a free quote today!

Frequently Asked Questions

Top 10 Plastic Injection Molding Questions

Plastic injection molding is the most popular process for manufacturing plastic parts. This process involves molten material which is injected into a mold to create a product. Our in-house molders provide both the design and manufacturing of these products. 

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1. What determines the cost of plastic molding?
   The cost of injection molding is determined by a number of factors such as; the number of cavities, the mold itself, complexity of parts, etc. The actual mold itself is usually the most expensive upfront cost. Additionally, the fewer number of cavities will lower your upfront cost and vice versa. We’re dedicated to providing customers with quality service at a lower cost
2. What sized businesses do you serve?
   When researching molding manufacturing companies it’s important to keep in mind your volume requirements and make sure they match that of the company you work with. The Toolroom is equipped to handle volume from small to large businesses. No matter the size of your project, we can help
3. What certifications should I look for when choosing a molder?
   Certifications are a great way to determine which molder is right for you. They show which businesses are at the top of the industry. At the Toolroom we are dedicated to providing the best services to our customers and this includes having the proper qualifications. When choosing a manufacturer, it’s important to research their current certifications to ensure you are getting quality manufacturing.
4. Should I buy my parts in the US or overseas?
   While working with a manufacturer overseas or even moving your business overseas will help save on up-front costs, working with a local manufacturer has numerous benefits. Choosing a local manufacturer is a great way to ensure open lines of communication during the course of your project. Choosing a manufacturer in the United States and more importantly, a local manufacturer has great long term effects in terms of cost and project turn-around time.
5. How long does it take to build a mold?
   Creating a plastic injection mold can take anywhere from 5-12 weeks. The complexity of each project will determine the turn-around time.
6. Can I get a mold warranty?
   Many mold manufacturers offer limited Lifetime Warranty for their molds. This ensures that if your project should need fixing, it can be done at no charge.
7. What type of material or resin is needed?
   Picking the right materials for your project, can a stressful task as there are hundreds of different products to choose from. Below are the 5 most common resins that can be used for injection molding:
   • ABS
   • Celcon
   • Polypropylene
   • HIPS
   • LDPE
8. What types of custom-built plastic injection molds are out there?
   There are several different plastic injection moldings available in the marketplace to fit your needs. The Toolroom has several custom-built moldings to choose from:
   • Unscrewing Molds
   • Two Shot Molds
   • Prototype Molds
   • Multi-Cavity Molds
   • Insert Molds
   • Stack Molds
9. What does the molding process look like?
   Here at The Toolroom we have a creative system in place to help guide you through every step of the injection molding process.
   • Send us the 3D CAD model along with all the mold requirements for your product
   • We will provide you with a quote
   • You will receive one-two reviews of your project design
   • Once we have your approval, the manufacturing process will start
   • After the molding process is complete, we will test run your product
10. What do I do if I already have an injection mold?
    If you already have an injection mold made, you will need to find a company that is also able to produce plastic parts. Luckily, The Toolroom is equipped with experts to help you develop any plastic product you made need.