Custom Injection Molding

Injection molding is an important process in custom components manufacturing, guaranteeing the creation of your unique designs with precision and efficiency.

What is Injection Molding?

Injection molding is a widely-used manufacturing process for creating large volumes of plastic and rubber parts. It’s especially suited for mass production, where the same part is produced thousands or even millions of times in succession. This efficient and precise method allows for the cost-effective production of custom parts. Injection molding products can be found in commercial, consumer, and industrial settings. Injection molding parts offers businesses the opportunity to custom design parts or items with details that are unique to their brand.

Types of Injection Molded Parts We Offer

Plastic Injection Parts

Our plastic injection molding service excels in producing a wide range of plastic parts for various industries, delivering cost-effective and high-quality results.

Custom Molded Components

With our rubber injection molding service, we create custom rubber parts with precision and durability. It is ideal for applications requiring flexible and resilient components.

Overmolding Parts

Overmolding combines multiple materials for complex parts. It enhances functionality and aesthetics, makes it suitable for products requiring added layers.

Insert Molded Parts

Insert molding integrates metal or other materials into plastic or rubber parts during the molding process. It's a cost-effective way to enhance strength and functionality.

Large Parts Injection Molding Applications

Injection Molding Large Parts

Our large part injection molding service is designed to produce oversized components. It's perfect for manufacturing larger parts without compromising quality or precision.

PU Molded Parts

Molten polyurethane is injected into a closed mold at high pressure. The high-pressure forces the polyurethane to completely fill the mold cavity.

Materials for Custom Injection Molding Parts

Injection molding materials come in a variety of shapes and sizes, each having a different purpose.Injection molding is a typical method of thermoplastic production. Material selection is challenging, despite the fact that numerous common plastics can be used for injection molding. 15 years of professional engineers offer a wide range of injection molding material options, from adaptive plastics to flexible rubber. Meet your unique needs and specifications.

Plastic

Polyethylene (PE)
Polypropylene (PP)
Polyvinyl Chloride (PVC)
Polystyrene (PS)
Acrylonitrile Butadiene Styrene (ABS)
Polycarbonate (PC)
Polyamide (Nylon)
Polyformaldehyde (POM)

Rubber

Ethylene Propylene Diene Monomer (EPDM)
Styrene-Butadiene Rubber (SBR)
Nitrile Rubber (NBR)
Natural Rubber (NR)
Silicone Rubber (VMQ)
Fluoroelastomers (Viton)
Neoprene(CR)
Fluoroelastomers(FKM)

Examples of Our Injection Molded Parts

Over the years, Flexiparts has manufactured a wide range of custom injection molded products for customers across various industries. From simple consumer components to complex engineering parts, our team has extensive experience working with different materials, structures, and production requirements.

Injection Moulding Working Process

To obtain a high-quality, flawless injection molding product, a professional and scientific injection moulding process is required.

Clamping

The mold, typically made of metal, is securely closed and clamped under high pressure to prevent material leakage.

Injection

Molten material, usually plastic, is forced into the mold cavity through a nozzle and into the mold's channels or runners.

Cooling

The mold is cooled, helping the material solidify and reducing cycle time.

Ejection

The mold opens, and the newly formed part is ejected using ejector pins or plates.

LET’S START A NEW INJECTION MOLDED PARTS

Tell us your requirement, our engineers help you make it a reality!

Advantages and Disadvantages of Injection Molding

Efficient Mass Production

Injection molding produces high volumes of parts quickly without compromising quality, making it cost-effective for large-scale manufacturing.

Consistent Quality

Strict process control ensures minimal defects, long-term reliability, and consistent product excellence.

Precision for Complex Designs

Capable of producing intricate geometries with high accuracy, injection molding supports innovative designs across industries.

Reduced Post-Processing

Parts often come out of the mold ready to use, minimizing additional finishing steps and speeding up production.

High Tooling Costs

Custom molds can be expensive, impacting budgets, especially for small runs or prototypes.

Design Sensitivity

Minor design errors may require costly rework or mold adjustments, demanding careful planning upfront.

Material Selection Challenges

Choosing the right material is critical; incorrect selection can compromise.

Wall Thickness Sensitivity

Uneven walls can cause warping, sink marks, or weak spots, increasing cost and difficulty.

Why Choose Flexiparts for Injection Molding Service?

At Flexiparts, we care about your parts like they were our own. We focus on making sure your design works, the molds last, and your production runs smoothly—so you can focus on your product, not the process. At Flexiparts, we make injection molding worry-free for you.

Fewer Design Headaches

we review your CAD files and suggest changes so parts mold correctly the first time.

Molds Stay Yours

we store them safely and handle all maintenance, so you never have to worry about wear or repeat orders.

Fast Predictable Delivery

we meet agreed lead times, and parts come consistent every batch.

Complex Parts Handled

thin walls, undercuts, multi-materials—we’ve done it all.

FAQs About Custom Injection Molding

Don't get your answer? View our FAQ page for answer.

What information do you need for an injection molding quote?

Usually a 3D CAD file (STEP or IGES), the material, and an estimated quantity are enough for us to start. If you also have drawings with tolerances or surface finish requirements, send them over and we can give you a more accurate quote.

How long does it take to build an injection mold?

In most cases, around 3–6 weeks. Simpler molds can be faster, while complex parts or special surface finishes may take a bit longer. Once the mold is ready, we run samples for approval before moving into production.

What wall thickness works best for injection molded parts?

For most plastics, a consistent wall thickness between 1 mm and 4 mm works well. The key thing is keeping it uniform so the part cools evenly and avoids issues like warping or sink marks.

What tolerances can injection molded parts achieve?

Most molded parts fall in the range of ±0.05 mm to ±0.1 mm. The exact tolerance depends on the material, the part design, and the mold itself. If your project needs tighter control, we can review it and see what's realistic.

Can you help improve my part design for injection molding?

Yes, we do DFM (Design for Manufacturability) checks on almost every project. Before building the mold, our engineers review your design and suggest adjustments—like wall thickness, draft angles, or gate placement—to make production smoother and reduce risk.

Who owns the injection mold after it is made?

Once the tooling is paid for, the mold belongs to you. We keep it safely stored at our facility and use it whenever you place repeat orders. The mold is also covered by our lifetime maintenance service, so we handle regular inspection and upkeep to keep production running smoothly.

Additional Molding Processing Methods

At Flexiparts, we offer a range of manufacturing processes to support different product structures, performance requirements, production volumes, and cost targets. By combining suitable processing technologies with engineering support, we help customers achieve more efficient production and reliable part performance. Our available manufacturing capabilities include:

Custom Plastic Parts

Custom Rubber Parts

Custom PU Parts

Manufacturing Process

Processing Materials

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